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Challenger SRT Hellcat
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200 Posts
Discussion Starter · #1 ·
Hey Guys,

As you know our hellcats are heavy and make lots of torque which is a disaster combination for driveline components. The tremec TR6060 which is in our hellcats is a great transmission but it's load rated to about 800tq which with very little modifications we surpass quickly.
Well I've built a torque MONSTER in my 1200+ whp / 1200 wtq twin turbo hellcat.

I've been through 5 Transmissions in the last year and a half, starting with stock ones and then rockland standard gear tranzilla 9310 units. I've also spoken to other big torque 6 speed hellcats and they are breaking built RPM, Tick and other builder Transmissions. The main reason I've found for this is, they are ALL variations of tremec gearsets which are all developed for stock car applications. Even after being cryo coated and rem polished by the best, the reliable limit I've found for me was 950 wheel tq.

Well GFORCE Transmissions developed their new TR6060 gearset with Dog Rings gears 1-4 which is rated to 2,000 ftlbs of torque. This gearset can be found in the fastest LS based stick vehicle, a chevy S10 running high 6s in the 1/4 mile.
They have now made it available for mopar and I will be doing all the testing for them by turning my car up to about 1300 wheel Torque / 1600 ft lbs of Torque at the crank.

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Full specs are :
  • Stock 5th and 6th overdrive gears
  • MUCH Larger / Wider Tooth design due to less teeth (compare to image with 5th/6th gear in image)
  • straighter cut on hellux angle
  • Dog Ring gear set 1-4
  • 9310 heat treated steel
  • tick performance billet front plate with oil spray bar
  • transmission oil pump system
  • billet shift fork

Some concerns I have are drivability with the Dog Rings and transmission whine from the straighter angle gears. I think there will always be some trade off when working with this level of power so I'm fine with it.

Pros should be lightening fast shifts, durability and increased confidence as the driver.
I'm also working on a computer option that may allow me to shift at WOT with no clutch and 100 milli second shift times 馃憖.

I pick up the new transmission in a couple days and I'm super excited to bring you guys on this journey from install to drivability to power delivery and best of all timing results on dragy and roll racing events.
 

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'19 Challenger Redeye
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1,388 Posts
Did you talk to Bubba at G Force? I dealt with him years ago when I bought one of their upgraded T-5 transmissions there.
 
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Challenger SRT Hellcat
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Nice!!! $?
 

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Challenger SRT Hellcat
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200 Posts
Discussion Starter · #5 ·
Did you talk to Bubba at G Force? I dealt with him years ago when I bought one of their upgraded T-5 transmissions there.
I dealt with Mark on mine

Im interested on pricing.
So I paid for it separately, the front plate was about $1000, the oil pump was about $400, I think the gearset was $5200, and then the labor of doing the build. I have to sit down and add it all up but I'd expect with shipping both ways we gotta be a little over $7k which isn't terrible if it holds the power 馃檹馃従

Nice!!! $?
A little over $7k all in I'm thinking
 

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938 Posts
Dang I have followed your channel for a while and I love the fact that you have stuck with the manual even though the easy and fastest way would be ditching it for an automatic. I even got frustrated for you when you kept breaking them.

One of them that I saw you break on the highway didn't even seem like you were hammering it too bad. That much torque along with the weight is just brutal.

I sure hope this solves your issues because you deserve some better luck with them and I'm not sure what you could do if this doesn't hold the power. Good luck!!!
 

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What's your channel? Would love to check it out.
 

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Yes sir the one and only
I run one of their G5鈥檚 in my Capri. First one I busted it first week, they rebuilt it on their dime as I brought it back the next morning, took it back home with me that afternoon, been fine since snd that鈥檚 at least 2 years ago now and many track passes. Shifts like lightning. I don鈥檛 think Bubba is there any more, you talk to Paul? He鈥檚 the one that redid my transmission same day I brought it back, I watched him do it from start to end, He said if it ever gives me a problem again to call them immediately and he鈥檒l take care of it never had to call him again thank God
 

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Challenger SRT Hellcat
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15 Posts
Hey Guys,

As you know our hellcats are heavy and make lots of torque which is a disaster combination for driveline components. The tremec TR6060 which is in our hellcats is a great transmission but it's load rated to about 800tq which with very little modifications we surpass quickly.
Well I've built a torque MONSTER in my 1200+ whp / 1200 wtq twin turbo hellcat.

I've been through 5 Transmissions in the last year and a half, starting with stock ones and then rockland standard gear tranzilla 9310 units. I've also spoken to other big torque 6 speed hellcats and they are breaking built RPM, Tick and other builder Transmissions. The main reason I've found for this is, they are ALL variations of tremec gearsets which are all developed for stock car applications. Even after being cryo coated and rem polished by the best, the reliable limit I've found for me was 950 wheel tq.

Well GFORCE Transmissions developed their new TR6060 gearset with Dog Rings gears 1-4 which is rated to 2,000 ftlbs of torque. This gearset can be found in the fastest LS based stick vehicle, a chevy S10 running high 6s in the 1/4 mile.
They have now made it available for mopar and I will be doing all the testing for them by turning my car up to about 1300 wheel Torque / 1600 ft lbs of Torque at the crank.

View attachment 589994

View attachment 589999
View attachment 590000
View attachment 589998

Full specs are :
  • Stock 5th and 6th overdrive gears
  • MUCH Larger / Wider Tooth design due to less teeth (compare to image with 5th/6th gear in image)
  • straighter cut on hellux angle
  • Dog Ring gear set 1-4
  • 9310 heat treated steel
  • tick performance billet front plate with oil spray bar
  • transmission oil pump system
  • billet shift fork

Some concerns I have are drivability with the Dog Rings and transmission whine from the straighter angle gears. I think there will always be some trade off when working with this level of power so I'm fine with it.

Pros should be lightening fast shifts, durability and increased confidence as the driver.
I'm also working on a computer option that may allow me to shift at WOT with no clutch and 100 milli second shift times 馃憖.

I pick up the new transmission in a couple days and I'm super excited to bring you guys on this journey from install to drivability to power delivery and best of all timing results on dragy and roll racing events.
Very interesting. I just went from an auto cat to a manual and can鈥檛 believe how much slower it is, so I鈥檝e am thinking about upping the power and was wondering about the transmission.
 

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Challenger SRT Redeye
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168 Posts
Hey Guys,

As you know our hellcats are heavy and make lots of torque which is a disaster combination for driveline components. The tremec TR6060 which is in our hellcats is a great transmission but it's load rated to about 800tq which with very little modifications we surpass quickly.
Well I've built a torque MONSTER in my 1200+ whp / 1200 wtq twin turbo hellcat.

I've been through 5 Transmissions in the last year and a half, starting with stock ones and then rockland standard gear tranzilla 9310 units. I've also spoken to other big torque 6 speed hellcats and they are breaking built RPM, Tick and other builder Transmissions. The main reason I've found for this is, they are ALL variations of tremec gearsets which are all developed for stock car applications. Even after being cryo coated and rem polished by the best, the reliable limit I've found for me was 950 wheel tq.

Well GFORCE Transmissions developed their new TR6060 gearset with Dog Rings gears 1-4 which is rated to 2,000 ftlbs of torque. This gearset can be found in the fastest LS based stick vehicle, a chevy S10 running high 6s in the 1/4 mile.
They have now made it available for mopar and I will be doing all the testing for them by turning my car up to about 1300 wheel Torque / 1600 ft lbs of Torque at the crank.

View attachment 589994

View attachment 589999
View attachment 590000
View attachment 589998

Full specs are :
  • Stock 5th and 6th overdrive gears
  • MUCH Larger / Wider Tooth design due to less teeth (compare to image with 5th/6th gear in image)
  • straighter cut on hellux angle
  • Dog Ring gear set 1-4
  • 9310 heat treated steel
  • tick performance billet front plate with oil spray bar
  • transmission oil pump system
  • billet shift fork

Some concerns I have are drivability with the Dog Rings and transmission whine from the straighter angle gears. I think there will always be some trade off when working with this level of power so I'm fine with it.

Pros should be lightening fast shifts, durability and increased confidence as the driver.
I'm also working on a computer option that may allow me to shift at WOT with no clutch and 100 milli second shift times 馃憖.

I pick up the new transmission in a couple days and I'm super excited to bring you guys on this journey from install to drivability to power delivery and best of all timing results on dragy and roll racing events.
Hey Guys,

As you know our hellcats are heavy and make lots of torque which is a disaster combination for driveline components. The tremec TR6060 which is in our hellcats is a great transmission but it's load rated to about 800tq which with very little modifications we surpass quickly.
Well I've built a torque MONSTER in my 1200+ whp / 1200 wtq twin turbo hellcat.

I've been through 5 Transmissions in the last year and a half, starting with stock ones and then rockland standard gear tranzilla 9310 units. I've also spoken to other big torque 6 speed hellcats and they are breaking built RPM, Tick and other builder Transmissions. The main reason I've found for this is, they are ALL variations of tremec gearsets which are all developed for stock car applications. Even after being cryo coated and rem polished by the best, the reliable limit I've found for me was 950 wheel tq.

Well GFORCE Transmissions developed their new TR6060 gearset with Dog Rings gears 1-4 which is rated to 2,000 ftlbs of torque. This gearset can be found in the fastest LS based stick vehicle, a chevy S10 running high 6s in the 1/4 mile.
They have now made it available for mopar and I will be doing all the testing for them by turning my car up to about 1300 wheel Torque / 1600 ft lbs of Torque at the crank.

View attachment 589994

View attachment 589999
View attachment 590000
View attachment 589998

Full specs are :
  • Stock 5th and 6th overdrive gears
  • MUCH Larger / Wider Tooth design due to less teeth (compare to image with 5th/6th gear in image)
  • straighter cut on hellux angle
  • Dog Ring gear set 1-4
  • 9310 heat treated steel
  • tick performance billet front plate with oil spray bar
  • transmission oil pump system
  • billet shift fork

Some concerns I have are drivability with the Dog Rings and transmission whine from the straighter angle gears. I think there will always be some trade off when working with this level of power so I'm fine with it.

Pros should be lightening fast shifts, durability and increased confidence as the driver.
I'm also working on a computer option that may allow me to shift at WOT with no clutch and 100 milli second shift times 馃憖.

I pick up the new transmission in a couple days and I'm super excited to bring you guys on this journey from install to drivability to power delivery and best of all timing results on dragy and roll racing events.
I've been using G-Force transmission's and other brands of clutch-less gear boxes for over 40 years in drag cars, road race cars, and some of my street cars. My 65 Corvette street car that I still drive around has a 5 speed G-Force Road Race trans in it with 900HP BB under the hood. Car runs in the 8's but is not a drag car. Its a street car-Road race car. Been together for 12,000 miles.
I have NEVER EVER broke anything in any G-Force Transmisson no matter what the power or usage. The company is the best trans company out there period.
Their internal trans pump gear drive oiling system is a piece of artwork. You can then run a remote cooler and have that much more fluid. Great system!.
The Drag race versions can be upshifted at full throttle no clutch. I would NOT advise doing that in your car!! The driveline in your car will come apart from the sudden NON cushioned shock of the shift. You're going from one ratio to the next with no gap between just BANG! And it can and will bang up parts in a street car like these heavy challengers. It's REALLY VIOLENT when not using a clutch. Real race cars are so much different. we have full tube chassis, suspension, and rear ends that designed for those shock loads, not to mention how much lighter a real race car is.
The G-Force Road race versions can be driven on the street, upshifted, down shifted as fast as you can pull the handle. All you need do on upshifting is lift slightly to unload the gears for a split second as you yank that lever, then mash the pedal back down. Sounds like an automatic when done right. I don't lift totally off the pedal. I just let it move back a tiny bit to unload the gears. Rpms are still up high but not loading. It will take PRACTICE to get that timing down when not using a clutch. On down shifts I lift off gas, and tap the throttle to unload the gears while pushing the shifter and it literally falls into the lower gear. Road racing using the LEFT foot for braking with a stick is awsum.
The noise from straight cut gears is load enough to here them over the sound of a 1000hp Big Block with open headers at 7500rpm. So you can forget about a sound system or talking to anyone while driving. Straight cut angled gears, I am not real sure of the amount of noise but it will make noise for sure. I only use real straight cut gears. Angle cut gears will put a load on the thrust bearings. By nature they are pushing against each other in opposite directions when loaded they place heavy loads at each end of the case. G-force has addressed those issues in their angled cut gear boxes. The gears still create a load. The box and related parts just has to be able to handle the end loads on the shafts and bearings.
A good friend of mine tried a clutch less straight angle gear cut trans (not a gforce) in a Comp Coupe Viper race car a couple years ago. Trans was built to shift full throttle-no clutch. He took it out after a couple months because he had issues from the shock on other parts. He drove it really hard though and doesn't listen to instructions very well
The transmission's with dog rings will clunk when putting them in gear like an old semi truck.
I love these transmissions and will never use anything else in a Hot rod street car or race car that has a manual trans. They are fun as hell to drive!
Not so sure about what your doing to a nice car like yours, but its always about the owner and what he wants. One thing for sure is you wont brake that gear box. Have fun yanking on that Lever, and keep us posted on how it works out for you.
 

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I watched your video on this. Also, thanks for posting the rough estimate of cost. I think you said around 7k to make something like this happen. Just wondering though, I watched your track session using the new transmission. Car looked like she moved out pretty nice. How confident are you feeling on the trans at this point? How is drivability? I too have gone through 2 transmissions at this point.. almost feels like the trans breaks before the rear or driveshaft to be honest. Thats the game though right.

In my case the stock trans just feels "squishy", just dont trust it now after my engine build. Its nothing like yours though.

So it drives out nice, shifts nice, feels solid? Thanks for posting some good info on this.
Hey Guys,

As you know our hellcats are heavy and make lots of torque which is a disaster combination for driveline components. The tremec TR6060 which is in our hellcats is a great transmission but it's load rated to about 800tq which with very little modifications we surpass quickly.
Well I've built a torque MONSTER in my 1200+ whp / 1200 wtq twin turbo hellcat.

I've been through 5 Transmissions in the last year and a half, starting with stock ones and then rockland standard gear tranzilla 9310 units. I've also spoken to other big torque 6 speed hellcats and they are breaking built RPM, Tick and other builder Transmissions. The main reason I've found for this is, they are ALL variations of tremec gearsets which are all developed for stock car applications. Even after being cryo coated and rem polished by the best, the reliable limit I've found for me was 950 wheel tq.

Well GFORCE Transmissions developed their new TR6060 gearset with Dog Rings gears 1-4 which is rated to 2,000 ftlbs of torque. This gearset can be found in the fastest LS based stick vehicle, a chevy S10 running high 6s in the 1/4 mile.
They have now made it available for mopar and I will be doing all the testing for them by turning my car up to about 1300 wheel Torque / 1600 ft lbs of Torque at the crank.

View attachment 589994

View attachment 589999
View attachment 590000
View attachment 589998

Full specs are :
  • Stock 5th and 6th overdrive gears
  • MUCH Larger / Wider Tooth design due to less teeth (compare to image with 5th/6th gear in image)
  • straighter cut on hellux angle
  • Dog Ring gear set 1-4
  • 9310 heat treated steel
  • tick performance billet front plate with oil spray bar
  • transmission oil pump system
  • billet shift fork

Some concerns I have are drivability with the Dog Rings and transmission whine from the straighter angle gears. I think there will always be some trade off when working with this level of power so I'm fine with it.

Pros should be lightening fast shifts, durability and increased confidence as the driver.
I'm also working on a computer option that may allow me to shift at WOT with no clutch and 100 milli second shift times 馃憖.

I pick up the new transmission in a couple days and I'm super excited to bring you guys on this journey from install to drivability to power delivery and best of all timing results on dragy and roll racing events.
 

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Challenger SRT Hellcat
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So how does the shift pattern work with this? With 1-4 having dog rings, and 5-6 normal, does that mean that gears 1-4 must be shifted through sequentially, and then 5-6 are normal and need to be clutched?
 

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FYI: Gave Gforce a call this morning. Price I was told is 9.5k . Thats me paying shipping on trans to them, them doing the rebuild, them getting it shipped back to me. If it holds the way they say it does, sounds like a better deal than build replace, replace, replace, replace.
 

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2015 Manual Challenger Hellcat
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FYI: Gave Gforce a call this morning. Price I was told is 9.5k . Thats me paying shipping on trans to them, them doing the rebuild, them getting it shipped back to me. If it holds the way they say it does, sounds like a better deal than build replace, replace, replace, replace.
I sent them an email about their prices and shipping outside the US the other day. I just wish they would work on their website because it is hard to find what you need, but here is what they said.



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So how does the shift pattern work with this? With 1-4 having dog rings, and 5-6 normal, does that mean that gears 1-4 must be shifted through sequentially, and then 5-6 are normal and need to be clutched?
Road racing transmission have been dog-clutch activated for many years, (before the current "wipe your nose for you" generation of electronic aids) that really rewarded relatively exact rev-matching with very fast gear engagement. Big trucks like Volvos and Scanias led the way with actual synchros when the other country's brands were still dog clutch activated, where "getting lost" in the gear ratios meant you had to actually pull over, stop the truck and work your way through them sequentially.

I, too, am interested in what the implications are for the dog clutch versus synchromesh trans as far as how sequential one would have to be.
 

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Challenger SRT Hellcat
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Discussion Starter · #20 ·
Just wanted to provide an update after a few months of hard pulls and some city driving.
I've ran at a few roll race events of which I've won my class in 2. I've also been to Mexico a couple times with doing 10 pulls in one night.
I can say I'm loving the Trans and I have the confidence to push the car again. I can honestly say if you are making over 1000whp with a manual Cat this is the best option. I haven't tried the PPG gearset so I cannot speak on it.

Check out some of my pulls, burnouts and races with gforce 6060 gearset :

Mod2Fame on Instagram: "I know you are supposed to put your windows up for a faster MPH but just listen to etttt. Man I love everything about this car 鉂 . . #mod2fame #Modsquad #hellcat #twinturbohellcat"

Mod2Fame on Instagram: "I did a few of these high 150s passes at pocono letting off well before the finish line. Nothing wrong with a little sand bagging 馃か . . #mod2fame #Modsquad #boostedhemi #twinturbohellcat"

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