quick history:

1988 240 dl with M47

Problem: shift knob bounces up and down on grooved freeway

Solution #1: replaced tansmission and engine mounts

no change

Solution #2: replaced center driveline center bearing and rubber mount.....and while I was under there and replaced the flex disc (M47).

New problem: Now my driveline vibrates.

I took the time and care to mark everything so that I put everything back together correctly. ie. rear driveline to differential coupling, and front and rear sections of the driveline before pulling the two parts apart to get at the bearing.

Everything seemed to fit together properly, nothing looks suspicious, and my U joints seem fine.

Question: Do I need to take it in to get the driveline balanced? or did I screw something up putting it back together.

Thanks in advance, this board is great!
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Ryan - '68 122, '88 240 DL (5 spd)