SPEEDYws6

iTrader: (9)

I just recently installed a Billingsley street 9" in my 02 TA along with a random tech T/A, yank transmission crossmember-T/A mount, and badZ lca's. Ever since I have noticed the car nose dives like crazy. SO much that abs can not keep the rear tires from locking up in a heavy braking situation. I can't see this being related to anything but pinion angle unless something else is off. Pinion angle is set at -3, again it didn't do this until I started changing the rear suspension up.

krexken

I can't see pinion angle or rear suspension components having anything to do with this. Your pinion angle sounds almost perfect. Sounds like a brake bias problem although you're probably using the same brakes and lines as before, right? I guess you could always try a proportioning valve/valves but that sounds like a band aid. First I might would try bleeding the brakes thoroughly and then bleed them some more.

SPEEDYws6

iTrader: (9)

I thought brake bias at first too, but have ruled that out as the brakes have not changed and I have bled the system many times now. This has me stumped, something that I have changed is causing more weight transfer to the front of the car than before.

jimmyblue

iTrader: (11)

The same instant center effect that makes it plant
hard on acceleration will work to make lift on braking.
Not pinion angle per se, but the combination of torque
arm and LCA angles.

The Yank crossmember I got has three holes in it.
I just set up pinion angle last night and found these
have negligible effect on pinion angle, but they would
appear to directly adjust the instant center point.

Which would be best for you, I have no clue but I
think this is where you'd want to play (presuming
yours is also adjustable there, I gather newer versions
you might have to drill yourself?).