ok. thats interesting. Anti-lock = ABS?

I didn't think there was any direct interaction between the two. However, i've noticed a slight response from the ABS when braking at very low speed- parking.

how would ABS affect diff?

85 WR quattro
90 V8 Silver, 91 V8 Black, 93 V8 Lago
93 100e quattro V6. Titan, i think