[DeTomaso] new owner ZF education time

[6d9gt500 at comcast.net]

Hello all.. As with most new owners I am changing fluids.. I drained my ZF and refilled with a 75W90 synth oil GL-5 for limited slip applications. Brand name stuff..I am not getting any chattering.. no noise shifting.. 

Read tons of threads on 75W90 redline and 75w90NS.. I can't get NS locally would have to order. Since I am not getting chatter.. and all seems fine.. My clutches may be shot. and I really don't drive it
to hard yet... so should I change the fluid to redline or let it be?? 

Thanks, Mark
Vancouver,WA USA