jgkurz Posted October 1, 2003 Share Posted October 1, 2003 Hi all, I just finished a complete drivetrain overhaul in my 77z and I'm a little disappointed with the results. First some history. I pulled the Nissan 5spd and original R200 and added a rebuilt T-5 and a low mile 3.7 R200 LSD. The clutch is a Spec 6 puck with a 240MM aluminum flywheel. Both half-shafts are solid and the driveline brand new. The mustache bar and sway bar have urethane bushings. I also have a rubber bumper mod done to my diff strap to prevent pinion rise. Here's my problem. The car has an ANNOYING clunk/clank in the drivetrain. I've had six other Z's and none have been this bad. I have checked all the usual problem spots and everything looks and feels good. The problem occurs when I shift gears normally and also when I'm just cruising down the freeway. When I did have the Nissan transmission in the car for a short time with the LSD the clunking didn't seem as bad. When I'm coasting or slowly driving downhill the problem is lessened. At this point all I can guess is that the T-5 has more backlash in the transmission than the Nissan unit. It's bad enough that I will avoid giving people a ride just so I wouldn't have to be asked "what's that noise" or "is it safe to drive". I've spent a small fortune on my Z so if the car isn't enjoyable to drive I have a serious problem. Needless to say I'm extremely frustrated. I would appreciate any feedback or opinions. Thanks Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted October 2, 2003 Share Posted October 2, 2003 It sounds like the typical Z rear end clunk... Check the diff mount and those rear bolts on the mustache bar again. When you installed the new diff, did you install a new diff mount as well? I know there are varied opinions on the solid diff mount, but I installed solid diff mounts in both my cars and stand by them. Also check the mustache bar bushings as well. That bar has been known to give an occasional clunk... Quote Link to comment Share on other sites More sharing options...
260DET Posted October 3, 2003 Share Posted October 3, 2003 Most of the transmission backlash in my car is due to the stub axles being a bit loose on the gear splines in the R200 diff. Apparently quite common. Quote Link to comment Share on other sites More sharing options...
Mike C Posted October 4, 2003 Share Posted October 4, 2003 Could also be a loose nut/bad bearing on an outside stub axle. Also, make sure your lug nuts are all tight! A loose gland nut on the strut housing or loose nuts holding the housing to the car can be suspect. Quote Link to comment Share on other sites More sharing options...
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