Vibration issue after 3.91 gear set install - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

swayf4 · 07-20-2016, 07:49 AM

I own a 2015 SS M6 with 8000km. I recently did a 3.91 gear (GM gear) swap which i am very happy with other than the issue i now have. All work was done at the local dealer. The Gear is very quite at any speed but the car develops a vibration when it reach higher speeds starting at 70mph and progressively get worst as speed climbs to a point the cars feels unstable. I don't recall having any vibration at all before the swap. My dealer is suggesting its flat spots in the tires? which i am having a hard time believing.. what would be you thoughts on this? also having a hard time getting the dealer to swap out rims/tire from another car on the lot to confirm or eliminate the tires from the equation. Also just to add i have had a hunter force balance performed already..

LSX Camaro · 07-20-2016, 09:00 AM

I would take a close look at the driveshaft, center support and couplers.

flyer08 · 07-20-2016, 09:26 AM

Sounds like the dealer just doesn't want to deal with it

pancherj · 07-20-2016, 09:42 AM

"Flat Spots" on tires was much more common with poly glass tires 40 years ago. With modern radials, I have had cars sit in one spot for several years and they still drove fine. Sounds like the dealer is trying to put you off...

swayf4 · 07-20-2016, 12:46 PM

Quote:

Originally Posted by LSX Camaro

I would take a close look at the driveshaft, center support and couplers.

Do you think it's possibly a part failure after the install or an issue with the work performed on the reinstall? Trying to decide how i will approach this now.

swayf4 · 07-20-2016, 12:51 PM

The dealer not wanting to deal with it is what worries me.

rontammy0 · 07-20-2016, 02:58 PM

If it wasn't there before the swap then it's something to do with the install plain and simple. Had my 391s done in may.....no noise or vibration before or after.

07-20-2016, 07:49 AM	#1
swayf4 Drives: 2015 Camaro ss rs Join Date: Jul 2016 Location: Newfoundland Posts: 3	Vibration issue after 3.91 gear set install I own a 2015 SS M6 with 8000km. I recently did a 3.91 gear (GM gear) swap which i am very happy with other than the issue i now have. All work was done at the local dealer. The Gear is very quite at any speed but the car develops a vibration when it reach higher speeds starting at 70mph and progressively get worst as speed climbs to a point the cars feels unstable. I don't recall having any vibration at all before the swap. My dealer is suggesting its flat spots in the tires? which i am having a hard time believing.. what would be you thoughts on this? also having a hard time getting the dealer to swap out rims/tire from another car on the lot to confirm or eliminate the tires from the equation. Also just to add i have had a hunter force balance performed already..

07-20-2016, 09:00 AM	#2
LSX Camaro Master ASE, GM, LSX Tech. Drives: 2010 Camaro SS Join Date: Oct 2012 Location: Austin, TX Posts: 1,034	I would take a close look at the driveshaft, center support and couplers. __________________ 2010 2SSRS A6, Custom Pat G. Cam, WCCH Cylinder Heads, Kooks Headers/Exhaust, BTR Valvetrain, Fluidampr 25% UDP, All Engine ARP bolts, Flex-a-lite radiator/Trans cooler, Yank converter, PFADT Suspension, ADM Race Intake/Scoop, Torq tow hook, CFD auto shifter, Dynojet AFR gauge, Aeroforce scan gauge, Brake Performance rotors/pads Prothane bushings, ZL1 wheels, spoiler, Z/28 wickerbill, 1LE Aero/Suspension Package, Anderson Composites COPO Carbon Fiber Hood, LED lighting, Elite Catch Can, Improved Racing oil pan baffle, crank scraper, windage tray 480 RWHP 452 RWTQ + Nitrous Express 150 Shot

07-20-2016, 09:26 AM	#3
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	Sounds like the dealer just doesn't want to deal with it

07-20-2016, 09:42 AM	#4
pancherj Drives: 2010 Camaro SS Join Date: Aug 2013 Location: Central PA Posts: 438	"Flat Spots" on tires was much more common with poly glass tires 40 years ago. With modern radials, I have had cars sit in one spot for several years and they still drove fine. Sounds like the dealer is trying to put you off...

07-20-2016, 12:51 PM	#6
swayf4 Drives: 2015 Camaro ss rs Join Date: Jul 2016 Location: Newfoundland Posts: 3	The dealer not wanting to deal with it is what worries me.

07-20-2016, 02:58 PM	#7
rontammy0 Account Suspended Drives: 2011 2SS/ RS INFERNO ORANGE L99 Join Date: Dec 2012 Location: Alliston Ontario Canada Posts: 9,057 View My Garage	If it wasn't there before the swap then it's something to do with the install plain and simple. Had my 391s done in may.....no noise or vibration before or after.