[JLMounce]

A quick update on this. I have installed a 2* pinion shim in both directions. This moved the pinion down about 1.5* and up about 2.5, not quite a full 2* in each direction. No change in vibration was noted with either direction.

I would actually say the vibration is getting worse and it has changed where it occurs from slightly off idle, to a now rpm dependent range of around 2800-3800 rpm before it then clears up.

Of note, because the engine angle is steeper, my header collectors have been scraping pretty badly getting the car on and off the lift. This has created a number of exhaust leaks in the system and moved things in such a manner that there are witness marks on the passenger side pipe from hitting the cross-member, as well as the passenger side collector flange which is now hitting the transmission pan. I know that exhaust hitting floorboard and such can cause some weird vibrations, but this is extremely noticeable in the car.

I have a new set of headers going on the car next week that should fit better than what's on there. They'll re-align the exhaust as well and get it off of the cross-member. I guess we'll see if that has any effect.

I have also ordered some transmission mount shims to try and raise that angle slightly as well. I know its working angle is still beyond what is considered "good."