Howdy,

I'm a 1999 miata 5sp owner, and I'm considering purchasing a 5th gear from a 86-91 NA RX7 for a swap to get my revs down for highway cruising. (My Miata has a .81

The following guide:
http://members.aol.com/solomiata/Drivetrain.html
http://members.aol.com/solomiata/Mia...terchange.html

lists the 87-91 NA RX7 as a .691 ratio 5th gear, with the 86 having the .711. However this is for American cars.

Is the Canadian RX7 the same ratio? I called my Mazda dealer, who won't give me the gear ratio / tooth counts, but says the same gear is used for 86-91 NA RX7's. So I suspect something is different in the Canadian cars.

Could anyone confirm the ratio of the Canadian 86-91 NA RX7's?

Regards,
Mitch

 

That seems to me like a mistake. As far as I know, 2nd gen RX-7's all have the same gear ratios.

I'd believe the Mazda dealer.

Then again, i'm on beer 3 for the evening.

 

Verts also have differnt gearing, but I'm 99.75% sure they are the same.

 

S4 and S5 have different ratios, for 5th gear anyways.

S4 N/A
http://www.rotaryheads.com/PDF/2nd_g...CAL%20DATA.pdf

S5 N/A, apparently it had 2 different ratios. The .756 ratio is only for the n/a's with the viscous lsds, but I thought that was only the turbos in S5.

http://www.rotaryheads.com/PDF/2nd_g...CAL%20DATA.pdf

 

86 rx-7s had a different gear ratio.. the 5th gear is the only difference .711,
from 87-91, they had a .697 5th gear except the american gtus which had a higher 5th gear ratio of .756... of course this is only n/a rx-7s
so the 86 is the only s4 that was different the rest are like the s5

i have a 89 gxl which has a 4.10 rear end, and a .697 5th gear, at 120 i'm roughly around 3000rpm... hope that helps

this info is from FSM, and Racing Beat...

 

Right the GTUs forgot about that little guy, explanes the viscous lsd.

 

Go to Mazdatrix website he has all the different tranny ratios for all the RX's and Miata's. THEY ARE NOT ALL THE SAME!

 

S4 TII vs S5 TII have identical gears.. at least my 10AE has the same as my viscious 90 TII!

 

we're talking about n/a's not tII

 

Your right untill you get to 5th gear, then it's different.

 

http://www.mazdatrix.com/g1.htm
The bottom of the page will answer all your questions

 

Thanks for all the help guys!

Unfortunately the miata has a different input shaft ratio than the rx7, so that nice .697 5th gear becomes a .75 or something in a Miata... Better, but not by much.

There doesn't seem to be any taller ratio 5th gears out there either, unless I go custom, which would probably be a lot of cash.

Cheers,
Mitch