91 735il problem

[atv087]

i was told my driveshaft was bad so i replaced it it had alot of play in it anyways so it needed to be replaced
but now instead of the clicking noise it was making its making a horrible vibration any ideas what it could be.

[Bear]

Interesting. The usual things are a bad center support and of course bad "U" joints, but if the shaft was replaced and balanced correctly and the center support was replaced and pre-loaded correctly, then unless the transmission support bushings are bad, I am at a loss.

[atv087]

it was a brand new shaft i put in there. i dont think theres really much to screw up on installing one. it was weird before that it was making a horrible clicking like it was thudding.

[Bear]

Get up and under and take a look at teh transmission support bushings, if they are flat that could be the problem.

[fastasshell]

Originally Posted by Bear

Get up and under and take a look at teh transmission support bushings, if they are flat that could be the problem.

hello this is someone that is having the same porblem on my 1990 735i bmw and i just replaced the center suport bearing but the tranny supports are smashed looking so i will have to replace them also i am having the vibration like he said above.( THE MOUNTS )should this fix my problem?

[atv087]

when you replace a driveshaft your supposed to replace the flex disk also it would cause a vibration like that according to a friend of mine. Also the tranny mounts could be flat but i would inspect it before you just jump at something it can get costly guessing.

[fastasshell]

i checked my flex disk and it looks okay.thats what made me think it was my tranny supports now is the mounts and the supports the same thing? decause the ones im talking about are right in front of the drive shaft two little rounded mounts they sit right next to each other. and thanks for the feed back i really appreciate it alot.

[atv087]

if the driveshaft is good then the tranny mounts could be cracked or dryrotted also make sure their not flattened out. if all that checks out id look twards a rear end problem or a bad driveshaft.

[fastasshell]

ok i will check to see if the mounts are flat then i will go from there. thanks for the info.

[atv087]

my problem was tranny mounts

[atv087]

my tranny mounts were split right in half

[fastasshell]

my mounts are split so that should be a good place to start?

[atv087]

yeah i found mine from egermanparts.com for about 15$ each i think. pretty simple to install too.