[munch]

I am crusing at different speeds and let off the gas and get a thud that sounds like it is coming from the rear, like being kicked in the rear.  Any idea?   

[62131]

I would check the rear u-joint.

[munch]

When I got my 200r a few months ago I also got a new drive shift and u-joints.  New trans mount as well.

[themoose]

Munch

How are you controlling your TCC?

Moose

[chopper526]

This trans has an overdrive doesn't it? I think you could try to duplicate the thud in and out of overdrive. I think it may be related to your overdrive, or maybe I have no idea what I am talking about

[RH]

I had a van as a kid that started making a thud when I turned corners. Didn't know anything about cars so afraid something was gonna fall off took it to a front end shop and they replaced some bushings and stuff. But when I picked it up and turned out of the parking lot - sure enough: "Thud"

So I drove right back in and told the guy, "Man, this thing is still makin noise!". He opened up the passenger door and pulled out a loose oil can from under the seat. "There's your noise" he said, and walked away. Man did I feel like a dork! 

[EDNY]

Kinda tough to give accurate info online...(but) check for loose leaf spring bolts, bad leaf bushings, cracked springs. (If using leaf springs of course).  Are your driveline angles correct?

The Vettes use a snubber on top of the differential above the pinion so when it's torqued the bushing contacts the frame.


But - don't rule out a front end noise traveling to the back.

My 2 cents

[munch]

I am going to put it on the lift thisorning and check it out.

I don't know what the TCC is.

[munch]

All seemed good with trans mount, u-joints, etc.  I did turn the back wheel and observed the opposite wheel turn in the opposite direction.  And when I reverse direction there is a definite lag before the wheels catch and a clank noise.  Could this be the cause of my thud?

[EDNY]

Hmmmmm.....sounds like could  be excessive pinion/ring gear gap?

[chopper526]

Rear wheels turning in opposite directions is an indication of an open (not posi rear). Also, I believe a certain amount of play or backlash, accompanied by a clunk, is expected when quckly reversing direction of the wheels off the ground. That's not to say you might not have excessive play. How far can you turn the wheel before it engages?

[62131]

I don't believe that you would hear the back lash in the rear end as it is under a load while the tires are on the ground and rotating. Are you running a leaf spring set up?

[munch]

Yes I have a leaf spring setup, but have a triangular four link waiting on coil over to go in.

[62131]

How are the bushings in the spring eyelets?

[munch]

The reverse in the rear wheels before it catches is minimal, don't think there is a problem there.  I cannot tell anything about the bushings in the eyelets.

But when checking the new drive shaft and joints, I can grab the front of the shaft at the yoke and get about 1/4 to 3/8 play turning back and forth.  Also I get a noise when it catches.  Is this normal?