1991 silverado
#1
1991 silverado
I am trying to find source of a vibration very prominent (bed shakes) from 55 mph and up. I have had the transmission rebuilt, new torque converter, driveshaft balanced 3 times and new U-joints. I have had the differential rebuilt and axel bearings. Wheels and tires road force balanced. most conservative approach is appreciated. I also replaced motor with stock gm 5.7 2 yrs ago.
#3
#4
Sounds like you have been through nearly everything. You may want to give your rear springs and u bolts a look. I've seen alot of cracked springs. U bolts tend to rust badly where they go through the bracket under the axle tube. Only other thing I can think of is a defective tire that didn't get caught during balancing. Maybe try swapping a spare on each side of the rear and see if it makes a difference.
#5
silverado
Sounds like you have been through nearly everything. You may want to give your rear springs and u bolts a look. I've seen alot of cracked springs. U bolts tend to rust badly where they go through the bracket under the axle tube. Only other thing I can think of is a defective tire that didn't get caught during balancing. Maybe try swapping a spare on each side of the rear and see if it makes a difference.
#6
CF Veteran
It's a longshot, but do you think an axle shaft could have a kink in the tube? And not having any idea where the axle was rebuilt, was it a quality shop? Having the driveshaft balanced three times I am assuming the trans mount is good, but even that shouldn't cause that heavy of a vibration if it was bad. Only other thing I can think of is check all the mounts all over the truck. If you find a fix, please get back to us. I'm a bit curious.
#7
It's a longshot, but do you think an axle shaft could have a kink in the tube? And not having any idea where the axle was rebuilt, was it a quality shop? Having the driveshaft balanced three times I am assuming the trans mount is good, but even that shouldn't cause that heavy of a vibration if it was bad. Only other thing I can think of is check all the mounts all over the truck. If you find a fix, please get back to us. I'm a bit curious.
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#8
CF Monarch
Originally Posted by vmaxman;327697[B
I had the tires rotated] [/B]1 week ago when the tires were road force balanced. This vibration occurs also when rear wheels are elevated under jack stands. I have also tried a variety 2 and 4 degree shims under axel.
#10
CF Monarch