Slight change in direction off/on throttle?

**GoldCloverLeaf** · 8th November 2013, 07:27 AM

Recently driving down the highway i noticed when backing off the throttle the vehicle would pull to the right slightly and when getting back onto the throttle it would straighten out or even slightly pull to the left?

It isn't nearly as noticeable at slower speeds but it's still there, you can sometimes feel it when changing gears as the weight transfers. I think it was a gradual thing but it was really noticeable at higher speeds after some track work recently.

Any ideas? It feels like it might be coming from the rear... A-frame bushes or ball joint? I'm going to take a good look at it tonight but was after some ideas?

**Psimpson7** · 8th November 2013, 07:28 AM

trailing arm bushes most likely at the chassis end.

**GoldCloverLeaf** · 8th November 2013, 07:35 AM

I'll have a look but they are new superpro bushes... i'd say less than 1500kms on them... trailing arms are kinked so shouldn't prematurely wear out with the small lift i have.

All bushes are new at all 4 corners except for the A-frame bushes.

Most of the front ball joints are new-ish but i'll check those as well.

And yes i check tyre pressure... shocks are good too.

**PhilipA** · 8th November 2013, 07:45 AM

A frame bushes can cause this.
Regards Philip A

**djam1** · 8th November 2013, 07:52 AM

A Detroit locker with differing tyre pressures in the back will do it too.

**steveG** · 8th November 2013, 08:41 AM

If the bushes are just new, check that the bolts are all still tight. Particularly if there was any wear in the bracket holes.

Steve

**87County** · 8th November 2013, 09:06 AM

Originally Posted by Psimpson7

trailing arm bushes most likely at the chassis end.

agree - trailing arm bushes the most likely - use oem ones not poly ones

n plus one · 8th November 2013, 10:40 AM

Originally Posted by 87County

agree - trailing arm bushes the most likely - use oem ones not poly ones

Care to elaborate around the OEM v poly issue?

**GoldCloverLeaf** · 8th November 2013, 10:40 AM

Thanks guys i'll have a good look tonight.

I already have a new a-frame ball joint ready to go in so i'll do the a-frame bushes while i'm at it.

I think the Superpro bushes have been proven... they are slotted at the chassis end to allow more flex as well. There is other rubbish stuff on the market though to steer clear of.

**JDNSW** · 8th November 2013, 02:43 PM

It will be one or more of the bushes locating either front or rear axle, so that the axle twists slightly going from drive to overrun or vice versa. There will be more free play on one side than the other.

It can be any of the bushes, but as suggested, the most likely is the rear lower link bush onto the axle housing. I think the A-frame bushes are unlikely to be at fault as they will only allow the rear axle to move sideways or rotate rather than twisting. I have experienced this from the lower link rear bushes, a loose lower link front bush, worn chassis bush on the front radius arm, and cracked chassis mount for the front radius arm.

Panhard rod bush wear will give wandering not throttle steering, but these can sometimes be confused.

John

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