On going woble...

[sandSStorm]

Hope some guru can help me pin point the problem.

I thought I had solved this problem before...

I own a 79 K5 with 6" suspension. The truck worked fine untill I changed the axles for some different ones mainly because the new ones have 3.73 gears and a locker in the rear. I also installed a manual tranny and ans np205 case.

The problem is a woble the blazer has as you go into or out of gears. Mainly the lower two. The truck will sway on either direction. Its unpredictable. The sway is so noticeable that I have to correct by turning the steering wheel the oposite way. Once the truck is going it will slowly allow me to bring the wheel back ...

Someone mentioned that the locker may be the problem... But how?

The front suspension is in good shape. I took it to an alignment shop and they could not find a thing..

Any suggestion?


TYIA

 

[FightinTXag]

Sure your U-bolts are tight? The rear end could be shifting under the truck when you change gears. That'd be more noticeable in the lower gears too (more torque to the ground would move the rear end more).

Rear wheel bearings good? They probably wouldn't cause the truck to sway as noticeably as you describe though.

 

[sandSStorm]

Sure your U-bolts are tight? The rear end could be shifting under the truck when you change gears. That'd be more noticeable in the lower gears too (more torque to the ground would move the rear end more).

Rear wheel bearings good? They probably wouldn't cause the truck to sway as noticeably as you describe though.

All nice and tight, and new seals and bearings..

 

[K5Kell]

6" spring lift tweaked a bit on the rear

What exactly is "tweaked" in the rear suspension?
-Kell-

 

[FightinTXag]

This may be obvious, but I'd say get someone you trust to slowly let the clutch out in 1st with no accelerator with the P-brake set while you're underneath watching the drivetrain/suspension - not to the point of stalling of course.

Maybe in 4lo with the front hubs unlocked if possible so you can see if anything is shifting or moving when the torque through the 2wd drivetrain is at max?

Sorry, I wouldn't really classify myself a guru, but at least I'm keeping your thread alive, huh?

 

[sandSStorm]

What exactly is "tweaked" in the rear suspension?
-Kell-

I relocated the rear spring perches by removing the bolts and droping it down about 3". Then a piece of 3" tubing sits behind it to keep the strenght. The tubing is welded to the perch then bolted to the frame..

Here is a pic..

And I just took this pic just for $hits and gigles..

 

[sandSStorm]

This may be obvious, but I'd say get someone you trust to slowly let the clutch out in 1st with no accelerator with the P-brake set while you're underneath watching the drivetrain/suspension - not to the point of stalling of course.

Maybe in 4lo with the front hubs unlocked if possible so you can see if anything is shifting or moving when the torque through the 2wd drivetrain is at max?

Sorry, I wouldn't really classify myself a guru, but at least I'm keeping your thread alive, huh?

Thanx for the post

We have actually tried all that and more. There is nothing that moves or seems loose.

 

[blank]

This could be a number of things. I had this once and it turned out to be tranny mount broke inside you could not tell it was broke but we changed it and it stopped. what else was changed any tires?

 

[blazinzuk]

Okay another idea here, our frames are weak just a fact of life. I think your frame my be flexing too much. The support on the bottom of the frame is not enough you need to extend the mount up more on the face of the frame where I drew the red line. This problem would be increased with the locker in the rear.

 

[sandSStorm]

Okay another idea here, our frames are weak just a fact of life. I think your frame my be flexing too much. The support on the bottom of the frame is not enough you need to extend the mount up more on the face of the frame where I drew the red line. This problem would be increased with the locker in the rear.

Thank you..

Well, today I replaced those with these...

and the wobble is still there...

AAARRGGG!!!!

This is gonna drive me nucking futs!!!!

 

[79k20350]

Thank you..

Well, today I replaced those with these...

and the wobble is still there...

AAARRGGG!!!!

This is gonna drive me nucking futs!!!!

I hope you used more than just those few bolts to holg those brackets on...that looks scary...

 

[roadnotca]

Wouldn't hurt to put the bolt back in the spring clamp.

 

[tRustyK5]

Most of that is probably 'locker steer'. My truck with a detroit locker and the 4 speed does that to some extent. Accelerate and the truck pulls slightly left, then as soon as you get off the throttle to shift it stops pulling but because you've corrected while accelerating it feels as though its now pulling right...then you get on it again after shifting and it pulls left a little again.

I got used to it...

Your truck may do it more than average because of the way you dropped your hangers. I'd bet on a 4 wheel alignment machine you'd see the rear diff isn't tracking perfectly anymore.

Rene

 

[sandSStorm]

Well,

We found out that the steering box was loose, so we replaced that. That seemed to take most of the sway away. Now it only has a small ammount of pull and I do believe that comes from the locker.

I think we finally got it...

I cant believe all that I went tru....

Ill keep ya all posted..

Thanx for your imput!

 

[sandSStorm]

aaarrrrggggg!!!!

Nope, its still there.....