You need not but a new driveshaft, with so many excellent reman places in the US. One of them Driveline Services of North Atlanta, was at one time doing driveshafts for BMWNA. this was to solve the problem on the early E36 cars. On the E30 and E28, there is a "harmonic balancer" on the front of the driveshaft, and the guibo or flex disc goes inside or right next to it. without this balancer, the driveshaft will vibrate like heck between shifts, especially in the 5 and 6 series cars. sometimes, the shop will remove the balancer because it is very expensive. when this happens, you sometimes get a weird vibration that no one can fix. However, we have found out that when one of the driveshaft places(beware of bozo driveshaft shops) does fix the driveshaft PROPERLY, and balances it, you no longer need the harmonic balancer. Hmmmmmm. One of the best places to go to is Beyer Motor Works in Phoenix, Arizona, they will send you a rebuilt one and charge you a core charge, which they will refund when they get your old one back. I can heartedly recommend both Beyer and Driveline of N Atlanta for excellent work, price, service, and warranty. It is in many cases, better than new!!!!