turbotim

how strong is the factory diff in a 87 gxl rx7, how much power will they take before they break, I just did a 2j swap and now I am thinking of upgrading the turbo's I want to target about 650 whp, but I wana know how much abuse that factory diff is going to take.

turbotim

what is a good upgrade option if they are not strong and if they are where can I get different gears for it, cause 4.10 is to low for me, I would like 3.55.

RotaryRocket88

iTrader: (7)

An NA 7" diff is going to blow up with 650whp. An 8" TII diff will take more abuse, but they're all going to be 4.1. You will have to go with a custom gear set if you want to change it.

southsidecox

iTrader: (52)

alot of guys with high HP setups are now going to the ford explorer/lincoln markV custom rearends,v8 guys can help you with that

southsidecox

iTrader: (52)

i meant mark VIII,ithink thats eight?

farberio

iTrader: (7)

VIII is 8, that's all I really got.

Except that your n/a diff will not like 650whp very much.

Rx-7heaven

iTrader: (1)

It'd be fine if you got no traction! But if you want to hook you'll distroy that thing!