3.91 gear install - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

morrissmck · 11-28-2014, 01:47 PM

I am in the middle of installing 3.91 gears and I have a question for the people that have installed the gears themselves. I bought the GM kit and it has a set of friction and steel discs for the posi. I assumed I would open the posi and add a friction and steel to each side. With the pack added to each side, it doesn't look right with the two halves of the posi on each other. I know the Belleville washers have to compress to preload, but there is a big gap to compress. Please reply back with what you did.

CamaroCracka · 11-30-2014, 09:58 AM

Some pics might elicit more of a response

morrissmck · 11-30-2014, 11:21 AM

Ended up talking with a gm mechanic friend and he said when he installs the gear kit, he replaces the friction and steel on each side if he sees any wear. Remove one friction and steel from each side and replaced with new since the car has 65,000 miles on it. Everything fit after that. Finished the install this morning and have done three heat cycles now. First impression is great. No longer does it require any gas pedal input to take off in first gear. Did some light throttle input between gear changes and car does not feel heavy anymore. Going to dealership to get speedo calibrated tomorrow and will do some full throttle pulls afterwards. I will reply with feedback, but so far I am impressed with this upgrade.

Seca Turbo · 11-30-2014, 11:30 AM

I was thinking of 4.11 on our V6. Have you tried starting in 2nd gear, just curious how bad it lugs.

11-28-2014, 01:47 PM	#1
morrissmck Drives: 2010 camaro ss m6 Join Date: Apr 2013 Location: south carolina Posts: 6	3.91 gear install I am in the middle of installing 3.91 gears and I have a question for the people that have installed the gears themselves. I bought the GM kit and it has a set of friction and steel discs for the posi. I assumed I would open the posi and add a friction and steel to each side. With the pack added to each side, it doesn't look right with the two halves of the posi on each other. I know the Belleville washers have to compress to preload, but there is a big gap to compress. Please reply back with what you did.

11-30-2014, 09:58 AM	#2
CamaroCracka Drives: 2010 Turbo LS3 Join Date: Dec 2009 Location: Palm Bay, FL Posts: 2,743	Some pics might elicit more of a response __________________ 2010 SS - On3 kit with downpipe cutout, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1/1LE brakes. 2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. ZL1 brakes.

11-30-2014, 11:21 AM	#3
morrissmck Drives: 2010 camaro ss m6 Join Date: Apr 2013 Location: south carolina Posts: 6	Ended up talking with a gm mechanic friend and he said when he installs the gear kit, he replaces the friction and steel on each side if he sees any wear. Remove one friction and steel from each side and replaced with new since the car has 65,000 miles on it. Everything fit after that. Finished the install this morning and have done three heat cycles now. First impression is great. No longer does it require any gas pedal input to take off in first gear. Did some light throttle input between gear changes and car does not feel heavy anymore. Going to dealership to get speedo calibrated tomorrow and will do some full throttle pulls afterwards. I will reply with feedback, but so far I am impressed with this upgrade.

11-30-2014, 11:30 AM	#4
Seca Turbo Drives: 2010 Synergy Green Edition Join Date: May 2010 Location: Forest Lake, MN Posts: 57 View My Garage	I was thinking of 4.11 on our V6. Have you tried starting in 2nd gear, just curious how bad it lugs.