Wobble in Truck

[Justin Fleming]

So I have been working on fixing up an 1987 GMC Jimmy. What I have going on is it seems like a wobble comes and goes in the truck. It is not in the steering wheel, it feel like the whole truck just wobbles side to side at times. I have been unable to consistently create it.

What has been done.
new tie rod ends, steering rod ends, upper and lower ball joints, new steering gear box, new front break rotors bearings, shock front and rear, steering stabilize shock system etc.

The only issue that I see un touch in the front end is the sway bar bushing are in bad shape. not sure if this could be it.

I jacked the rear of the truck up and put in drive and I did not see a bad belt in a tire or anything like that.

I have not rebalanced the tires yet, someone had balanced them before so I am assuming that they are close. The truck is completely stock except the tires are 33"


I notice a little noise on deceleration when the truck was jacked up, possibly coming from the rear end... not to sure. The rear end has new gear oil etc.

I notice a little slop in the u-joint but certainly nothing major

Any ideas....It almost feels like a bent rim, but I don't feel it in the wheel or in the pedals....

 

[diesel4me]

Probably irregular wear patterns on the tires,especially the front--I once "rotated" the tires on my '72 K5 and only made it a mile from the shop before it started wobbling SO bad,the body felt like it was coming off the frame...put all 4 tires back on the original location and it was fine again..

Sometimes a belt in a tire warps or shifts and can cause this...doubt if the sway bar bushings will make any difference,trucks without a sway bar dont wobble..

 

[Supervillainmc]

Had a similar problem a yr ago on my 87 K5 also with 33in tires. One of the rear tires had a really bad uneven wear. I bought 2 really good used Goodyears same threads for$50 Ea from a place that gets almost new tires from wrecked SUVs by old Shea Stadium. They balanced them and all. Problem gone. I bet u have the same or similar issue.

 

[Kain]

^^^THIS will make a wobble from hell , i have that issue right now