Richard Fisher

The original drive shaft was bad from the factory and the pinion angle was off by one degree. Replacing the drive shaft and correcting the pinion angle both did not stop the vibration. After installing the Caltracs, the vibration is gone. I don't much care what it took to correct the problem. Just came back from a drive that gave me the opportunity to get up to about 107mph and no vibration problems. It does make a slight clunk when crossing rough ground though.

After chasing the elusive vibration issue with my 2015 Sierra crew cab short bed for most of a year, I finally expanded my search. My truck had been lowered with long shackles and shocks in the rear and a drop spindle kit in the front which did not cause my vibration issue. It also did not change the issue and I had decided to just live with it until I blew the drive shaft somewhere north of 95 mph. Lucky for me the truck had been lowered so the rear part of the drive shaft just skipped along the road surface. Now for what appears to be the fix that works for me. I found CALVERT Racing of California and got a set of Caltrac 3400's installed after making sure the pinion angle and drive line were all in specs, about 1 degree negative pinion. This seems to be the best $400.00 ever spent. No shake, No rattle, No role, No vibration all the way up and down; 0 to 112 mph anyway and no ill ride effects. The ride seems to be tighter and totally stable at all speeds. Total cost for me was about a grand and has a warranty. As far as I'm concerned GM should put Caltracs on all of their Silverado and Sierra 1500 pickups. They could probably do it for no more than a $300.00 price change out the door and make a lot more people happy. .

Have a 2015 Sierra, 5.3 engine, crew cab, 5'9" bed. I have lowered it with drop spindle kit and bell tech shocks, cold air kit, and flow master cat back. Have also installed a super chip. Have had a vibration since I got the truck but thought it may be air turbulence since I had to cut the front spoiler about 3". Anyway on Thursday 17 Nov I decided enough of this vibration stuff. I decided to drive through it as it came and went about 50 ish, I just kept pushing and about 93 it came in again and got worse up to about 98 so I started backing off and it blew at about 92 mph. No problems getting down to a stop place. First called a wrecker, then uninstalled the super chip. The drive shaft looked like it had been cut off with a hacksaw, That little thin aluminum tube packed with cardboard shouldn't even be on a truck. The service dpt told me that it would take 500hp, show me. Anyway warranty is going to cover it and any consequential damages. I wanted a aftermarket steel driveshaft, about $350.00 but they talked me into taking another stock one and if it vibrated they would give me free installation on an aftermarket unit. It should be ready on Tuesday. We will see and I will keep you informed. The old man (76 comin 77) Richard