Vibration

[Mohammed_A]

Had my driveshaft shortened and flange change and balance when changing to the ZF ///M3 Gearbox with the s50 swap.
Problem im having is that im feeling a vibration but only when the car is cold, as soon as it driven for a little bit the vibration goes away..

any ideas on what this could be??

[E30_fiend]

did you have the driveshaft balanced when you had it shortened? It could also possibly be binding u-joints that free up when they warm up

[Mohammed_A]

Yes i had it balanced, im thinking it could be the exhaust ???