Transmission Vibration??

[scottmrit]

I have a 94 cobra with 3.73 and stock driveshaft. I have a nasty vibration through the shifter and i can some vibration through the pedals. Vibration is there with clutch in or out and transmission in neutral or in gear. Vibration comes more noticeable with rpm.
Tires have been balanced and the front end has been aligned. I have not had the driveshaft balanced yet. Transmission was rebuilt 5 thousand miles ago, replaced clutch and resurfaced flywheel. I read on on thread that it should be the front bearing of the transmission if it causes a vibration when it is in neutral.

I pulled the transmission already i am going to replace the pilot bearing, clutch and throw out bearing, and transmission mount. I do not know if i should take my tranny to a shop to have them look at it or not.

Figured that it should not be the bearings since they are only 5k old.
Any ideas???

 

[Jaswir]

check out your balancer

 

[2002BLGT]

dont know who rebuilt it , but I would check the output shaft in the tranny it might be bent slightly , if so it will cause a nasty vibration while the car is going down the road

 

[scottmrit]

Balancer is good, will a tranny shop be albe to tell if it is bent with out tearing it down?

 

[blindoboy87]

have the same problem but its developed further into a gear whining noise in 123 and 5. i priced out a reman tranny for $695 with a warranty on ebay

 

[spyder2455]

you say the vibration increases with rpm, but what about speed? If you're cruising at 2k then let out the clutch, is the vibration still present? If it is, then I would suspect the driveshaft is out of balance, or the u-joints are bad. If the vib goes away, then it's engine/transmission related. It doesn't seem likely that the input shaft bearing would be damaged since the tranny was rebuilt 5k miles ago. The only way I could imagine this happening is if the bellhousing was not indexed and was bolted up off of the centerline, and over time put a localized stress on the input shaft bearing and pilot bearing causing premature wear.

 

[scottmrit]

The vibrations increase with speed also. I do not like to go over 70 vibs are to bad. Over 1500 rpm the vibs start to get bad and if i put in clutch still there, and also if i put it in neutral still there.
Thanks for the replies, i guess i will get the DS balanced and hope this helps.

 

[79_cobra]

i had a small dent in my driveshaft that was causing some bad vibrations.