Quote Originally Posted by edwardb View Post
If I understand correctly, your IRS diff is pointed UP toward the front. That is correct. I've done two IRS builds and both were the same. This is all fixtured by FFR, and no reason any would be different. Welding moves things around (like the suspension tabs) but these are solid frame mounts and every one should come out the same. Also, logically this is correct. Normal for the engine/trans to be pointed DOWN. So between the two (engine and IRS diff) they would be roughly parallel. Both of mine came out at 1.4 degrees difference, which is in the acceptable 1-2 degree range. And driven a bunch of miles with no issues. Keep in mind your measurements are all relative, e.g. should be compared with each other. No guarantee your chassis is sitting level, and it doesn't matter if you look at it that way.
Hi Paul,
It was point down towards the front, the opposite of what we want.