A few facts first:
Completely stripped down 57
I have about 250 pounds in trunk to simulate a gas tank, bumpers & misc
The current pinion angle is between 2.5 and 3 degrees on the stock rear end.

While test fitting the LS 5.3 & 4L60E the angle at tail shaft is 5 degrees.

I cannot get less engine angle because the top of the tail shaft is hitting transmission tunnel.



I had not planned on modifying the tunnel for this project. Am I missing something?