Identifying Second Gen rear end

B

BBeasley

New member
I'm attempting to put together a 4.10 turbo II rear end for my 89 RX7. Currently I have an ISC 5.12 which I'm replacing with the turbo II (Engine swap requires 4.10 gearing). My friend shipped me the unit in the pictures. How do you tell from the outside that it's a turbo II?
It takes just over 4 revolutions of the input plate to rotate the axle 1 revolution. I guess that's a 4.10?
I also need turbo II axles and have located a set. The seller said that axles are S4 or S5 specific. How do I tell which version, of the rear end, I have?
I understand the two versions (older FC or newer FC) LSDs work differently. Since I'm putting in a Kaaz I was told the difference does not matter so it just comes down to axles.... right?

Thanks,
Bob

re1.gif

re2.gif

re3.gif

re4.gif
 
If you have a normally aspirated rear end to compare with, the centers of the studs/bolts on the turbo unit are farther apart than on the na unit, both for the driveshaft and the axels. You know that you need a turbo driveshaft, right? And that the turbo driveshaft requires a turbo transmission. Don't know about the s4/s5 issues.
 
pinion modification for rearend 5:12-4:88 other

I have access to getting the pinions modified for the rearends....if interested just PM me. You furnish donor pinion and new pinion.....
 
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