[bulladean_]

hey guys i just put a 65mm lift in my 94 sierra . There efs spring with commy hiace shocks. It feels amazing offroad but i couldnt drive faster than 50ks an hour without it getting death wobbles. There so bad i have to completly stop then take off again. I had some of bruces soft bushers in so i swapped then out for the stock ones. It stopped then on the way to work at 100 ks it happened again. Everything is in right and i had it checked by a mechanic. I dont no what i should do. I think my steering is out a little because i bent the drag link but i took it out and straightened it again.

[buzbox]

Have you had a wheel alignment done and wheels balanced after installing them? Start with that first.

I had the same issue, I swapped the tyres on it and it made a fair bit of a difference already, then got the wheel alignment done and it was all good for the first two months, a slight wobble started happening again after I went offroading. I put it down to wheel alignment.

I had them double check and tighten any bolts that I had done up while they were under there.

Also type sierra death wobble into search for other possiblilities.

[bulladean_]

im gonna get a wheel and steering alignment. I took the spare car today and dad took mine for a spin, he went off. Hes trying to tell me its the shocks. In positive its not.

[tanshi]

if the shocks are new its not the shocks.

wheel alignment
wheel balance
are you running extended shackles? if so take them out and put standard ones in
king pin bearings
wheel bearings

[bulladean_]

i tried to tell him. Nah still stock shackle. Im gonna get the align
ments then go form there.

[bulladean_]

also does anyone else have this set up. If so is it really bouncy ?

[tanshi]

yes they are bouncy.
its why people generally remove a leaf or two from the packs before fitting

[Red89]

What tyre pressure are you running.

[bulladean_]

im running my tyres round 30 psi

[Red89]

30 would have been ok with your old worn springs but may be a bit high with your new stiffer ones, a lot of guys run low 20s or lower on road. You will also find the springs should soften up a little bit with use.

[Trypt]

I had bad wobbles at about from 50-70k. as soon as i put new wheels and tyres the wobbles stopped
Get a wheel alignment and or balance

[stockman]

Sounds like your wheels could be out of balance.

ps. recommended tyre pressure for a Sierra under normal loads is 20psi

[bulladean_]

all fix. I had 20mm of toe in one wheel.