Buster12

I just finished an experiment related to vibe and shake. Installed leaf spring clamps about 4-5" behind the rear axle. Huge reduction in both.. Not perfect but 80% better... My tires are road force balanced perfect (I had a severe shake due to RF balance but that's fixed).. I think the rear axle is moving around causing the shake/vibe to transmitting up the drive shaft, through the transmission to the engine. Engine shake is shaking and grounding out the motor mounts but the source is the rear end. I suspect one of three problems.. 1- crap leaf springs, 2- ring/pinion, and motor mount ground out (needs 3mm shims) My idea came from the fact that my truck rode better after I had it parked facing downhill or it changed based upon weight in the bed. Noticed the leaf spring spacing looked different every other day.. Floppy leaf springs are causing the rear axle to float around and then the drive shaft oscillates. Next steps - traction bars from calvert racing or replacement leaf springs... Check ring and pinion backlash..... Either new motor mounts or 3mm shims... Most likely all three of these items need to be done for a comprehensive solution. It's been a year and I'm done with GM.. fixing it myself.

Hello all, I've been fighting with this for a year. Tire road force helped dramatically. Dealer went thru 9 new tires before they could get the RF to spec.. I have the rally 22" rims which I consider a misapplication. I'm currently looking for 18" rims. Recommendation: Check your transmission fluid. I'm convinced my problem is torque converter shutter. My fuild is stained and I get brown, black contamination of the dipstick. TC clutch is not fully engaging at certain speeds and the TC clutch plates are wearing out. Most when cold. Run 60-70 miles and I think the heat makes it run better. Hooked up my snowmobile trailer last week and the shake/vibe was 6X worse. That made me start thinking transmission. My problem 100% load/torque dependent. Shake/vib/ shutter at 60-75 mph and 30-40mph. At 75mph and above, the TC locks and it runs smooth as glass. When the TC is not locked the TC shutter makes the engine flutter in the mounts resulting in vibe/shake.. Engine shake transmits thru the engine mounts and is whats felt due to the TC shutter. I have a GM complaint and I'm taking it in next week for my 6-7 dealer visit. Think about it. GM wanted to beat the comp and advertise the highest MPG 1/2 ton. They programmed the transmission shift points all wrong. Then tried to fix it with an 8 speed transmission. The 8 speed has a TSB for the torque converter problem/fix. Second thing they did wrong was try to make the truck cool looking.. 20 & 22" wheels!! Never had an issue with the 17" rims and RF balance for years. Low profile tires create RF balance issues. Only long term solution is to have more side wall and smaller diameter rims

/profile/6563-daveo/?do=hovercard" data-mentionid="6563" rel="">@DaveO I have a $50k shaker.. I won't bore you with my problems.. New approach is I'm taking my truck to an auto expert for a complete vibration evaluation. Once they find the solution, I'll give GM one more shot to try and fix this POG. I'm half expecting the rear diff is the problem so first order is pop the cover and check the gears and backlash. Might be less expensive for me to pay for the repairs than taking a $5-10k hit and trading it in for another brand. I'm in the manufacturing business and have been involved in "Silent Recalls". I believe GM is well aware of the issue but the cost benefit analysis doesn't warrant a recall. Nobody had died yet from a shaky truck (but I'm having chest pains). They are spending most of their time dealing with ignition switch crashes and deaths so no help for the idiots that purchased a shaker.

I had vibration problems but solved them myself after three trips to the dealer.. Drivers side shock tower bolts were loose and that helped. I lifted the truck and found the passenger sway bar link was loose. I believe the loose link caused most of the vibration.