Just wanna ask if the 4AT final drive of 4.3 can direct fit onto the 6MT diff to replace the 4.444 FD without modification? Reason is trying to get a more comfortable rpm for cruising. If the RX7 3.9 can fit, it would be better 0-100 or 0-400 doesn't really matter as I had gave up already

 

yes

but if you know about the 3.9.. why not just use that.

 

i think the 4at has a 4.1