If You are trying to prevent low band apply in manual low, You can weld a hole in the transfer plate up & toss the low/reverse check ball, I've done that...with 4:11's I wasn't concerned with coast-braking in 1st with the trans so....I just wanted a clean manual 1-2 shift w/o burning My kickdown band again. With a stk. 904, & a Slanty making ~190hp, it worked well.