OK guys,

I drove the 4Runner yesterday with the 37's for the first time, boy is that thing tall..........to tall. Anyway I am driving it everywhere to break in the springs and hopefully get some sag in it.

So here is the problem, when I accelerate rapidly or stop rapidly the rear end makes a clunking sound. Sort of like the third member is being pushed up or down and then setting in place. There seems to be some axle rap going on, as I rock the truck back and forth by pulling on the bumper you can see the pumpkin move up an down.

Does anybody have an idea on what it may be??

Here is the set up, 5" Marlin USA springs mounted to two" lift shackles (soon to be removed) shocks are in the stock position.

Thanks for any help you may send my way.

 

ujoint could be the clunking it happened to my 82....the 86 i just sold was starting to clunk and i was rocking it by moving the tire to see if it was the u joint and i noticed my 3rd member was doing that to and i didnt no what it was

 

search for "clunk" and you will find several threads. no definitive answers tho. seems like a common problem, and i know that i've had the clunk in every pre-tacoma pickup that i've owned, to one degree or another.

 

Found the issue, seems that the U bolts came loose after driving only 20 miles. My friend torqued them to the correct specs and we planned on checking them again in about a 100 miles but now I think everyday for about a week and then once a week for a month or so.