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2015 SRT Hellcat M6 and 2016 SRT Hellcat A8
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53 Posts
Discussion Starter · #1 ·
I have read that fitting a 3.09 diff head from a 6.4 SRT is a good first upgrade. Were all 6.4 SRT challengers fitted with the 3.09 limited slip diff?

My Hellcat is a 2016 if this is important

Thanks in advance for any replies
 

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2015 Charger SRT Hellcat
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4,023 Posts
I thought that the 392 and Hellcat rear ends were the same size/strength? That's what I was told when shopping for coil overs. I could see the ratio change for the power difference though.
 

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Challenger SRT 392
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9,279 Posts
They are both 230 mm but the Redeye/Demon 3.09 has a hardened case and heat treated gears for extra strength compared to the Scat Pack 3.09. If you compare prices you will see the difference between these two.


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