Or theories on how it changes the performance of the car? More importantly, how is effects the rear end? I'm having problems with breaking my 9" and I think it is due to my pinion angle. I don't know what it's set at right now. I have pulled the center sec. and will check the contact patch and backlash. If all checks out, then I'll pull it apart. Any suggestions?

I'm running a 4.11 gear w/ a spool that I bought complete from moser. It's in a manual car w/ a raceweight of 3350 and is launched off the 2 step above 5500rpm.

What are you breaking? The only thing a bad pinion angle will hurt is the u-joint.

Here is one that I like.

http://www.wolferacecraft.com/pinionangle.aspx

Nothing wrong with that explanation.

As for an example, my ladder bar suspension is set in the zero to -1 range. Since everything is solid, there's no diff rotation. Just up and down movement on the springs.

That what I was thinking. My car obviously isn't the fasting thing out there (see sig), but I only made 4 passes w/ the new moser center section and now it's making a horrible noise. I'm not sure if I cracked the solid spacer or what. There should be no reason why a 360rwhp car can hurt a rear that's built for (what moser claims) 2000hp. The center is out, and I'll be measure and inspecting all tonight. Will post up tomorrow what I find.

PS - Thanks for the link.

Freebird, there has been alot of issues with Moser lately. I've had friends that had to reset their rear up, after a qualified Moser assembly shop could not get it right a second time.

I was refering to the 12 bolt. I see in your post, that, you are refering to the 9". I suppose it could still happen with either Moser rear, though.

Backlash was .010" the wear patter was bias towards the toe. I'll be adding a shim to the pinion tonight to move it out closer to the heel and checking it again. Thanks for the help guys.