I have a 2000 Z3 2.8 with a 5-speed manual transmission. Any thoughts on what would cause a clunking sound when shifting. The sound is coming from within the end of the tranny near the driveshaft.
does it only happen while moving or can you do it while sitting still? If it is while moving does it only happen under acceleration and fast shifting or normal shifting. Does it happen all the time? There are quite a few Z3 owners with the same problem you described but different issues, sorry about all the questions.
The clunking only happens while moving. Its most pronounced when in first gear and I push in the clutch to shift gears it sounds like a double clunk. It is more pronounced under normal shifting and seems better when accelerating to around 4 grand and then clutching to shift. It clunks in all gears but is more pronounced in the lower gears. It does this pretty much all the time.
Exhaust hitting something? But my guess is u-joint. I had a similar problem when I punched it at the start of an autocross.
I had it in the shop and they said after putting it on the hoist they determined that it wasn't the u-jhoints or anything hitting it. But that the clunking was inside and near the rear of the transmission. It was beyond anything they (the shop) wanted to work on. Thanks for the suggestion…I also thought it was the u-joints. Anyone know of a reliable tranny shop in the Ft. Myers area??
I give them credit for not tearing into the tranny since they felt it was beyond them. Not even a tranny mount?
The problem with drive line noises is the noise can travel from either direction and travel to the area you are hearing it in the vehicle. Could be something with the clutch fork traveling through the transmission. It could be the center bearing in the driveshaft. Could be but most likely not rear subframe bushings, differental bushings. Yes do make sure the transmission business are in good shape to though.
Useful info on the guibo - http://blog.bavauto.com/14113/bmw-how-to-properly-install-driveshaft-flex-disc-giubo/
Sometimes the suspension needs to be loaded to diagnosis a problem which makes it difficult on a lift. Well, depending on the lift.
I really appreciate the suggestions. It has given me some ideas to explore. I still think it might be related to the flex disc….my question on this is would a flex disc make a noise all the time? The clunk is far less pronounced when shifting from higher rev's.
If your guibo looks like this or this or like this one on the right then I'd think you'd be getting clunking mostly on up & downshifts - another potential item is the center support bearing.
