Rear end shimmy question

[dracula4999]

I have a 70 short stepside. I haven't had the truck very long and am still learning all the things that have been done to it. It has been lowered with blocks in the rear for sure but other than that I have no clue what has been done to the suspension. While driving normally, maybe quarter to half throttle, every time the truck shifts the rear of the truck seems to wiggle a bit. It feels as though the springs are really soft, or something is loose. I have looked under the truck and don't see anything out of the ordinary. Is this normal with a coil spring truck? My 71 gmc was leaf spring and long bed and didn't have this issue. Has a 350/350, feels as though it has a little shift kit. Any insight would be greatly appreciated.

[ga-stepside]

Since it has lowering blocks first thing I would look at is the u-bolts.

1. Where the trailing arm meets the cross member (pivot bushing) - 140 ft-lbs
2. The U bolts that hold the trailing arms to the rear end – 145 for standard suspension 200 ft-lbs for heavy duty.
3. The lower bolts that hold the rear coil springs - 55 ft-lbs
4. The upper lower bolts that hold the rear coil springs - 50 ft-lbs
5. The upper and lower bolts that hold the shocks - 50 ft-lbs
6. The upper track bar bolt 135 ft-lbs

[dracula4999]

Thanks I'll check that all out

[ga-stepside]

Originally Posted by dracula4999

Thanks I'll check that all out

Also look at the u-joint on the diff and the pinion angle since its been lowered.

[LockDoc]

-
Maybe someone took the stabilizer/track bar off and didn't put it back on.

LockDoc

[dracula4999]

Originally Posted by LockDoc

-
Maybe someone took the stabilizer/track bar off and didn't put it back on.

LockDoc

I wondered same thing at first, but its still on there.