TimZ Posted May 6, 2001 Share Posted May 6, 2001 Well, it's always something. I finally got my car back on the road a couple of weeks ago, with a freshened trans and diff, new clutch, new CV's, etc., and it had been running exceptionally well. I drove it around for several hours yesterday, and it didn't skip a beat. This morning, I pulled it out of the garage, polished up the wheels, and then pulled out of the driveway to go for a ride. Oddly, in first gear, there is a definite periodic clunk sound coming from the drivetrain. I put the car up on jackstands, checked underneath and didn't see anything obvious, so I started it up and tried just releasing the clutch in different gears. The noise is definitely there, and it only does it in first gear. I can hear it quite clearly if I put my ear to the gearshift knob. Next, I drained the gear oil out of the trans, and checked the magnet in the drain plug. There were a fair amount of fine shavings, but no big pieces of gear tooth or anything. I'm guessing that I'm going to have to pull the trans back out and have it looked at. The weird thing is that I drove it all over creation yesterday, and everything was fine, and now this morning it sounds like it lost a tooth. I guess maybe something was almost ready to let go, and it decided to do it today? Anybody have any ideas/suggestions, before I pull this thing? I'm going to wait a day or so, just in case I'm not thinking of something obvious. Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted May 8, 2001 Share Posted May 8, 2001 It sounds to me as if you have hit a resonance point in the tranny that only occurs if you have the following situation. Peak torque occuring at 4400 rmp and peak hp starting at 5400 rpm with both torque and hp achieving the 450@wheels mark. This will cause a google wave to crack the gears under hard acceleration. I hope this helps, it is a common occurance. Quote Link to comment Share on other sites More sharing options...
TimZ Posted May 8, 2001 Author Share Posted May 8, 2001 Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted May 8, 2001 Share Posted May 8, 2001 ROFL! I sent you a message about cams. Quote Link to comment Share on other sites More sharing options...
Andrew Bayley Posted May 8, 2001 Share Posted May 8, 2001 Too bad you didn't post this before last Wednesday, the guy in Arizona I got a Z from had two Five speeds laying on the floor, free for the taking. I replied: "Nah, I don't know of anyone who needs one." ...sorry -Andy Quote Link to comment Share on other sites More sharing options...
TimZ Posted May 8, 2001 Author Share Posted May 8, 2001 Doh! It just keeps getting worse. Anyway, I pulled the trans last night, and am taking it in today. I think I'm getting a little too good at this - 2.5 hours from car intact on jackstands to trans in the trunk of the Taurus... Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted May 8, 2001 Share Posted May 8, 2001 That doesn't sound very fast to me, you must be getting old or something! Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted May 10, 2001 Share Posted May 10, 2001 i put my car on rack at work and pull trans in 1/2 hour.the nissan trans is easy to work on but if you dont have trans experience it is best to take it to a shop that does manual trans. Quote Link to comment Share on other sites More sharing options...
Guest mattrp Posted May 23, 2001 Share Posted May 23, 2001 I have a similiar clunk coming from my tranny when it sits at idle, but I'm pretty sure its because of the input shaft bearings. Let me know if you figure it out. Matt Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 7, 2001 Share Posted June 7, 2001 Well, if you're ever passing through St. Louis, MO, I have a 76 5 speed that is solid. $50. I'll give it away for free if the taker will also take the 76 l28 and accessories too. It's taking up too much room! And no, I don't want to ship it. Sorry. I don't have any way to haul it somewhere. Someone would have to come and get it out of my garage or driveway. Quote Link to comment Share on other sites More sharing options...
jimzdat Posted June 7, 2001 Share Posted June 7, 2001 Dewzenol--just how much stuff is included in "accessories"? I'm just a few hours away, and if you really want to get rid of it that badly, I might be able to help you out (sometimes having a 1 ton pickup can come in real handy) Jim Quote Link to comment Share on other sites More sharing options...
TimZ Posted June 7, 2001 Author Share Posted June 7, 2001 Funny you should mention this - I just got it back together and out on the road tonight. As suspected, I had lost a tooth on the mainshaft first gear. Kind of strange - there were some stress cracks on the two adjacent teeth, possibly caused by added stress after the first let go. The missing tooth had just kind of let go - there was no evidence of the gear having been torn off, or anything. Maybe it was just a void in the casting or something... Quote Link to comment Share on other sites More sharing options...
Guest MM_280Z Posted June 7, 2001 Share Posted June 7, 2001 quote: Originally posted by 240Z Turbo: This will cause a google wave to crack the gears under hard acceleration. Heh, google wave?! You're BSing right? Is that really what it's called? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 15, 2001 Share Posted June 15, 2001 Looks like Jim took me seriously. I went out to my garage one morning last week and all my Z stuff was gone, with a fifty dollar bill in its place. If anybody needs 280 parts bug him! Quote Link to comment Share on other sites More sharing options...
jimzdat Posted June 15, 2001 Share Posted June 15, 2001 quote If anybody needs 280 parts bug him! But you better be quick about it-'cause some of these parts are going in my 260 (Thanks again, Rob) Quote Link to comment Share on other sites More sharing options...
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