DIY diff swap?

Discussion in 'SRT Hellcat Builds' started by rags, Dec 12, 2016.

  1. rags

    rags Hellcat Member

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    Hi Guys, has anyone documented their diff swap? Guess I'm getting lazy and wanted to ask first before diving into the swap. Exhaust removal necessary? Are the axles snap ringed in?

    Thanks in advance.

    Joe
     
  2. rwhite692

    rwhite692 Gold Member

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    There are several of us that have done it ourselves. No, the axles are not retained.

    If you do a search on "3.09 swap" you will find a couple of threads here on doing it.
     
  3. wwbill617

    wwbill617 SRT Hellcat Supporter Gold Supporting Member

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    I too am about to swap mine out. I did a search on "3.09 swap" and did not find a "show how" thread. I can remember reading some on this subject but now can't find it.

    Bill
     
  4. NorCaletch19He77Kat

    NorCaletch19He77Kat Silver Member

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    I have a M6 and switched out my 3:70 to a dealer installed ZF unit in 3:90 gear..

    The factory 3:70 is in perfection condition and will ship direct from the dealer-- price is$650 us and the unit is perfect...
     
  5. Mike Comp T/A #57

    Mike Comp T/A #57 Gold Member

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  6. Mo-par!

    Mo-par! Bone Stock Hellcat Car Club

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    /\/\/\/\ Thanks for linking Mike.
     
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  7. rags

    rags Hellcat Member

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    Well I did the swap last night and thought I'd run through what I learned. It's not that bad.
    Four exhaust hangar bolts, 2 exhaust clamp bolts, 8 driveshaft bolts, 4 diff bolts, and 2 electrical connectors for the exhaust valves are all you have to remove.
    Start with the exhaust. Loosten the 2 clamps forward of the x pipe.
    Disconnect the electrical connectors on the exhaust valves and push out the clips that hold the wires to the exhaust hangars so when the exhaust is dropped it doesn't hang on the wires. When you see it you will understand.
    Remove the 2 bolts that hold the exhaust hangars out at the exhaust tips.
    Remove the 2 bolts that hold the exhaust hangars that are just forward of the exhaust valves. Don't worry, the exhaust won't come down yet as those hangars are on hooks besides being bolted to the body. Here is where you need 2 people. One guy to push up on the exhaust so it comes off the hooks and lower it down slightly, and one guy to tap on the cross bar that runs between the pipes so the entire exhaust will slide off the front pipes at the clamps. Once it slides off the front pipes the entire thing can be removed.
    Remove the 8 driveshaft bolts.
    Now for the diff bolts. Start at the 2 bolts that go into the rear of the diff. You will see you can't remove them completely as the bolts will run into the body. Back them out until you can't any more, then support the diff with a suitable jack.
    Remove the 2 bolts that hold the front of the diff to the body. They are the verical bolts. Once removed, lower the jack about an inch and move the diff forward so you can continue to remove the 2 bolts at the back of the diff.
    Once you get those 2 bolts out, the only thing that will be holding the diff up is the jack and the axles. Don't let it slip off the jack as it's pretty heavy and awkward.
    Lower the jack down slowly and move the diff forward a few inches and stop before completely binding the axles. I started on the driver side axle. You will need to pull the axle from the diff by disengaging the snap ring inside the diff. I used a prybar and a hammer. Positioning thr prybar between the diff and inner cv body only took one or two light blows with the hammer to release the snap ring. Once released, remove the axle. Do the same for the passenger side axle.
    Installation is reverse of removal. Axles first, followed by rear diff bolts, then front diff bolts then driveshaft then exhaust!

    I should have used my camera for pictures but didn't think of it at the time.
     
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  8. wwbill617

    wwbill617 SRT Hellcat Supporter Gold Supporting Member

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    Thanks for the write up. Fix'n to do this in a week or so.
     
  9. Mo-par!

    Mo-par! Bone Stock Hellcat Car Club

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    Do you recall if snap ring pliers would work here instead of the hammer method?
     
  10. Racist Cat

    Racist Cat Gold Member

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    It feels like a ball seat. It's just held firmly in place. It pops in and pops out.
     
  11. rags

    rags Hellcat Member

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    No, you won't be able to get to the ring. They are on the ends of the stub axles that are inside the diff. The hammer method really soulds worse than it is. Pretty simple when you try it.
     
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  12. swatdoc

    swatdoc Gold Member

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    Don't suppose anyone has a pic of those snap rings? I'm having a hard time picturing how to hammer them out. I have always used snap ring pliers like Mo-par said.
     
  13. Racist Cat

    Racist Cat Gold Member

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    The shafts just pull out, and new ones pop in.
    You don't remove or install anything.
     
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  14. Booky

    Booky Gold Member

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    I do not know if this will help any for a reference, but this shows the axles from a R/T being upgraded.

    Go to 2:20 to 3:20




    Another video I found just for reference is this SRT Charger getting a 373 upgrade:

     
    Last edited: Jan 1, 2017
  15. rags

    rags Hellcat Member

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    Here you go.
    snap ring.jpg
     
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