It sounds like it's coming from the drive shaft but I assume it's a bearing in the end of the transmission. There is a little bit of up and down movement when I grab the DS and push up and down but the seal doesn't appear to be leaking at all. What do you guys think?


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Thanks in advance and sorry for the shitty vid. Paul

 

The video doesn't appear to be working so let me try this.

IMG_04591_zps077afc4f.mp4 Video by hptech4564 | Photobucket

 

It's whatever is rubbing on the shaft..you can see a piece of metal that is making a mark on it.

 

If I'm seeing what I think you are talking about that's just a bad camera angle. Nothing is touching the drive shaft. Now the piece on the end of the drive shaft might be rubbing the trans.

I need to find a manual for the trans

 

the driveshaft has a dust cup on it that protects the tail seal.
If that cup gets bent it will rub the trans case at the tail.
Check that out.

 

Yeah I was thinking that might be the issue. Let me run this by you and see what you think. Like an idiot I forgot to mention this in the first post but it only does this noise when I back up or when downshifting/engine breaking. Now what I think might be happening is the long shaft that's in the trans that's connecting to the driveshaft has a little bit of play so when I back up or let off the throttle it forces it up a bit and that protective cap rubs and makes that noise. There are 4 little vents in that cap and when I rotate it, it looks like it might be rubbing the trans (one side is cleaner on the tail under the cap). I hope that makes sense

One reason I believe this is the issue is ever since I bought the car the trans has been noisy, like bearing noise. So I think there could be enough play in there to let the shaft move a bit.

If this is the issue would it be possible to cut the cap off without throwing the DS balance off? I know the best thing to do it fix replace the trans but that's just not an option right now. I guess I could pull the driveshaft and grind a few thousands off the trans where it's rubbing lol, or just do what I'm doing now and don't engine brake

Edit: BTW when I made the video I had the car in reverse and pulled the e-brake up a bit to make the issue clear.....or louder I guess ha.

 

Ive done many clutches on these cars, and up until I did a pilot bearing for a friend, I had never seen this mystical 'cup'. Id cut it off lol

 

I think I might put it back up on stands and get it to make the noise again then spray WD40 on the "cup/cap" and see if that stops the noise. If so, I guess I'll cut it off.

BTW I don't remember this cup/cap on any of my other RX7's but it's been a while since I've owned one.