3.27 differential

Drivetrain discussion including Transmission, Differential, Driveshaft, and related items.
amx1pxp
Posts: 54
Joined: Thu Mar 14, 2019 3:02 am

Re: 3.27 differential

Post by amx1pxp »

Thanks!
bstoner
Posts: 233
Joined: Wed May 05, 2021 2:12 pm

Re: 3.27 differential

Post by bstoner »

Thought I would post this to help others understand after doing a ton of research.

Sizes
There are several sizes of differentials. The larger/stronger 218 mm (8.6 in) ring gear and the smaller 195mm (7.68) ring gear. There is also the Camaro ZL1 that comes with 9.9 inch but isn't typically swapped into the Caprice due to size issues. The Caprice, G8, and SS come with the smaller 195mm ring gear. The V6 AT Camaros come with the smaller ring gear. The V6 MT and V8 (AT & MT) Camaros come with the larger 218mm ring gear.

Ratios
Small ring gear (195mm)
The Caprice comes with 2.92. The G8 comes with GT-2.92, GXP Auto-3.27, and GXP Manual-3.37. The SS comes Auto-3.27, Manual- 3.70. The 2010-2015 V6 AT Camaros come with 3.27 (open diff, not locking G80).

Large ring gear (218mm)
The 2010-2015 V6 MT Camaros and V8 AT SS Camaros came with 3.27. The V8 SS Manual Camaros came with the 3.45.

RPO Codes
MN6- Generic 6-Speed manual
M10- Wide ratio Tremec TR6060
MM6- Close ratio Tremec TR6060
MG9- Heavy duty Tremec TR6060 in ZR1
MV5- V6 manual trans
MX0- Generic auto trans
MYB- 6L50E in the V6
MYC- 6L80E in the SS
MYD- 6L90E in the ZL1
G80- Limited slip
GM3- 3.45 ratio
GT4- 3.73 ratio
GU5- 3.23 ratio
GW6- 3.27 ratio
GW8- 2.92 ratio

Part numbers
3.45 – 22928327 (old part no. 92249270) SS Manual
3.27- 22928326 (old part no. 92246989) SS Auto

Swap
All of these (Caprice, G8, SS, Camaros (not ZL1) can be diff swapped. Buy the diff and swap complete. So if you want the larger diff look for a 2010-2015 Camaro AT SS or V6 MT Camaro for 3.27 gear or the V8 MT SS Camaro for the 3.45 gear. To my knowledge all of these are G80 locking diffs. The V6 AT Camaros are non-locking.

Potential Upgrades
Higher strength differential cover- https://www.lpwracing.com/Diff_Cover_Co ... rison.html
Eaton Detroit TruTrac 912A686 (gear design diff)
JRE Posi Mod https://jannettyracing.com/products/jre ... -camaro-ss (tighter lockup)
DIY Posi Mod https://g8nation.com/showthread.php?t=43654 (same thing as JRE, tighter lockup)
BMR bushings viewtopic.php?t=2081
2014 Caprice PPV, 6.0L, BTR Stage 2 Cam, 3.45, 3" exhaust, Rotofab intake, Chris Henry tuned, future LSA....
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elc32955
System Manager
Posts: 2718
Joined: Thu Nov 29, 2012 10:32 am
Location: East Central Florida
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Re: 3.27 differential

Post by elc32955 »

Excellent post, thanks for sharing this info with us combined into one post!

Eric
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.
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