matt_w Posted August 21, 2013 Share Posted August 21, 2013 I've been noticing a loud clunk when I let off or on the gas while driving. All my rear end components were brand new/refurbished, so I was suspecting it was a backlash issue (I had added a gear driven LSD to my R200). I just pulled the rear end and everything was in spec. Once the rear end was out, I tried rotating the driveline (still sticking out of the T56) with the car in gear, and I believe the clunk noise is coming from there. I get a fair amount of play when rotating it back and forth. Anyone else have a similar issue? This is a newly rebuilt T56 from a reputable source. Is this not an issue in f-bodies because they have better sound deadening? Quote Link to comment Share on other sites More sharing options...
Robftw Posted August 21, 2013 Share Posted August 21, 2013 Could be your diffential rubber mount going out, check the leather strap on the nose of the r200 a good way to fix this is to get a pinion snubber installed. Search here or google for some results and how-tos Quote Link to comment Share on other sites More sharing options...
matt_w Posted August 21, 2013 Author Share Posted August 21, 2013 Thanks for the reply. I have a ron tyler mount and the differential mount itself is definitely good. The only place with free-play is the T56. I'm fairly certain it's the cause. Quote Link to comment Share on other sites More sharing options...
SUNNY Z Posted August 21, 2013 Share Posted August 21, 2013 Bushing for t56? Quote Link to comment Share on other sites More sharing options...
matt_w Posted August 21, 2013 Author Share Posted August 21, 2013 (edited) Sorry guys, I didn't do a good job of explaining this. With the rear end completely out of the car and driveline sticking out of the transmission (which is in gear), I can rotate the driveline probably ~5 or so degrees back and forth before it stops. This ~5 degrees of play is what is causing the clunk. It is very noticeable when driving, as anytime you let off or step on the gas, it "clunks" to re-engage. My question is if anyone else has experienced this or if my transmission is messed up. Edited August 21, 2013 by matt_w Quote Link to comment Share on other sites More sharing options...
wfritts911 Posted August 21, 2013 Share Posted August 21, 2013 My car does the exact same thing. My T56 has a bunch of slop in it as well. Its had the same clunk when going from decel to accel(And vice-versa) ever since the LS1/T56 was in my firebird. Same clunk on 3 different rear end setups, its still there on my 8.8 swap. Most definitely in the tranny. More noticeable in higher gears at low rpm. One of these days I will finally tear down my transmission to rebuild it and hopefully figure out what the issue is and fix it, but that day is a long ways away. Only real downside is shocking the drivetrain on shifts. I think the slop has helped kill a few ujoints. And obviously being extremely annoying and making the car sound like its about to fall apart to other people. -Will Quote Link to comment Share on other sites More sharing options...
matt_w Posted August 21, 2013 Author Share Posted August 21, 2013 My car does the exact same thing. My T56 has a bunch of slop in it as well. Its had the same clunk when going from decel to accel(And vice-versa) ever since the LS1/T56 was in my firebird. Same clunk on 3 different rear end setups, its still there on my 8.8 swap. Most definitely in the tranny. More noticeable in higher gears at low rpm. One of these days I will finally tear down my transmission to rebuild it and hopefully figure out what the issue is and fix it, but that day is a long ways away. Only real downside is shocking the drivetrain on shifts. I think the slop has helped kill a few ujoints. And obviously being extremely annoying and making the car sound like its about to fall apart to other people. -Will Thanks, this sets my mind at ease. I found a few threads on LS1/LT1 boards where people had the same issue, so it must be semi-common. Quote Link to comment Share on other sites More sharing options...
fastzcars Posted August 23, 2013 Share Posted August 23, 2013 I have the same issue with my t56 and it was brand new trans! I think its an inherent design "flaw". Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 23, 2013 Share Posted August 23, 2013 http://forums.hybridz.org/topic/105207-the-dreaded-diff-clunk/ Note at the very end that Arne from classiczcars.com replaced a woodruff key in his Nissan transmission to stop a clunk. Quote Link to comment Share on other sites More sharing options...
SUNNY Z Posted August 23, 2013 Share Posted August 23, 2013 Sorry guys, I didn't do a good job of explaining this. With the rear end completely out of the car and driveline sticking out of the transmission (which is in gear), I can rotate the driveline probably ~5 or so degrees back and forth before it stops. This ~5 degrees of play is what is causing the clunk. It is very noticeable when driving, as anytime you let off or step on the gas, it "clunks" to re-engage. My question is if anyone else has experienced this or if my transmission is messed up. OH. Yeah, Mine does that. Every T56 I've ever been around does it. Not really a concern, you just have to drive around it - if you know what I'm saying. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted August 24, 2013 Share Posted August 24, 2013 Your tranny is normal. Quote Link to comment Share on other sites More sharing options...
sweetride2go Posted August 28, 2013 Share Posted August 28, 2013 I have a clunk, but I have found a worn spline on my right rear stub axle. Guess it is time to do bearings... Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted August 28, 2013 Share Posted August 28, 2013 Hate to break it to you fellas, but if your Z doesn't have rearend clunk: there's something wrong. They all clunk like hello. Lets you know its a z. Get used to it an keep driving. Oh yeah, the diffs whine like a mother too. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 28, 2013 Share Posted August 28, 2013 I have a clunk, but I have found a worn spline on my right rear stub axle. Guess it is time to do bearings... I know where you can pick up some sweet 280ZXT stub axle nuts: http://www.ebay.com/itm/271253803761?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649 Quote Link to comment Share on other sites More sharing options...
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