sorry about the miss understanding. miata highway gears suck. so i was going to put the rear assemly fom a rx7 to help out my highway gears.

 

Anything will fit with enough money, sorry though i dont know if it will but just take a look at it and try.

Sorry

 

The Miata guys would probably know the answer to this question. Sorry I don't have any links for you...

-s-

 

#1 the RX-7 has a 4:10 rear end whereas the Miata has a 4:3 so its not really going to make a very big difference at all. If your miata doesn't have forced induction your going to have to do a lot of extra "rowing". The miata is geared the way it is for a reason, and having lower RPMs to cruise at isn't going to help your gas mileage much, the fact that it is a convertible and has a poor drag coefficient is a more important factor. A simpler way of decreasing your RPMs would be to install the 6 speed rear end, which has a lower final gear than the 5 speed, but you will have to downshift into 4th anytime you want to accelerate on the freeway.

 

The power Miata guy's are using TII rears with minimal fabrication.

 

thanks for the infor guys

 

i have a friend with a highly fabricated miata., he just got done putting a tII diff, tranny, and hubs into his miata. was not easy by no means, but should hold up quite well

 

www.solomiata.com has some good info on miata rear ends IIRC

http://members.aol.com/solomiata/Drivetrain.html