Serious snap in driveline - 93atx

[qiksho]

Serious snap in driveline - Found Problem...what is it called??

Hey guys I have a major problem with my 93atx. Anytime you get on the gas or brake fairly hard there is a loud snap. Now watching from outside the vehicle while someone else drives the car you can actually watch the tire move when it does it.

I thought it was the subframe bushings. Yesterday I put in the aluminum subframe bushings and this did not cure my problem...just made it louder

I can't see anything that looks bad. What can do to try and diagnose this further? HOw do I check the tranny mount? I tried putting the ebrake on and doing the engine mount test, but I can't really see anything. Motor mounts are good by the way.

IT seems too violent to be a c/v shaft...but I guess it is possible. ONly does it from a stop and usually when on the moderately hard. Turning doesn't make it better or worse.

Does the tranny uses a primary multi-link chain and straight cut gears to connect transmission main shafts? This would be considered the main drive chain for the tranny. Anyone have history that this could be the culprit?

Any help would be greatly appreciated.

Thanks,
Brandyn


Ok guys I found the problem tonight when I swapped sub-bushings from my 92-93. The bars that go from the lower control arm??? to the subframe on both sides. Well where they attach to the subframe I can move them around and there is not much bushing left. What exactly is this bar and bushings called? What is best to put back in there? Can I get just bushings?

Thanks,
Brandyn

 

[Brian Smith]

You might try checking on the lower control arm pinch bolt. Mine came loose because I am a fool and didnt replace it after removing it. The effects were dramatic and unsettling, and there could not have been more than three or four millimeters of play. I have discovered the hard way that this is a very important fastener.

 

[projectSHO89]

Also, check the forward strut rod bushing and the cup in the front rail of the subframe where the bushings sit. This cup has been known to separate from the subframe and cause similar symptoms. It may be necessary to completely remove the large forward nut and the front bushing half to see how the cup actually is.

If this is the problem, the cup can be welded back onto the subframe.

Steve

 

[qiksho]

Bump..any other suggestions?

 

[Brian Smith]

My only advice is to work backwards from the tire. Thats what I did in a similar situation. You can see that the wheel is actually moving right? So start there. How is your wheel bearing? Ball joint? Strut rod bushing? Control arm to frame bushing? Tie rod ends? The list is finite, although I am sure I have missed at least a few. In earlier posts of my own submission I have been advised to check for play in the wheel by jacking it off the ground and giving it a pull in several directions. I can only pass this advice on to you. If I recall, 12 and 6 oclock and 9 and 3 are important. Play in any given direction can help narrow potential problems. More specific info on this test can be found in other threads.