Just dropped in a ZZ4 motor with a SuperRam on it and the aftermarket T-56 trans in to my car, I used Spohn’s cross member, torque arm and driveshaft.
I have the pinion angle at 0* and do not feel any binding in the driveshaft when I rotate it by hand, but when I drive the car and go more then 20% throttle then I get this really bad vibration. At cruse speeds it’s not there and when taking of at less then 20% it not there. Today I ran it to 45% throttle and 4500 rpms and once it got above 3500 it seemed to smooth out.
So what could be causing this, anyone have any ideas?
I sent Spohn an email Wednesday but still have got no reply back yet.

Well let's see.... the vibration changes in correlation with engine speed. That would indicate to me, that something's not cherry with the engine. Check your harmonic balancer maybe ? Your accessories ? Belt ? etc etc ?

That's what I am starting to think and seeing as I have a little bit of a cooling problem I wonder if it might be the water pump.

It's an Edelbrock that was on the car and it did sit around for a year, might be the bearings are going out.


Thanks for the idea :hail: Odyssey, I have been kind of obsessed with the pinion angle and I think I got tunnel vision.

You should not have Zero Degrees of pinion angle. Even if the vibe is gone you should readjust to -1 to -1.5 degrees pinion angle or you can ruin the u-joints. Also, if you have not done it yet, you should have the Driveshaft balanced. It only cost about $50 and provides peace of mind.