Were there any improvments made to the transmissions to handle the increased power or are they the same between the series 4 and 5? I am specifically asking about the T2 transmissions. I have problems with my tranny in my 89 GXL and recently picked up a 87 T2 parts car so I am going to swap in the T2 tranny, driveshaft, rearend, and halfshafts. When I order my clutch kit what would I order for 87-88, 89-91 or does it not matter because they are the same? I remember reading somewhere to use the flywheel for your series engine but not sure if any of the rx7 gurus backed this info up. I plan on putting a 89-91 turbo engine in down the road when the NA engine gives out so please no "buy a t2" comments.

 

sounds what I am about to take on. But before I get started there, I need to figure out if the slave cylinder from series four will match up to the series 5. My clutch went to the floor and that is the closest thing I can come up with.
any help would be greatly appreciated.

 

i switched my slaves between the two trannys S4/S5 without any incident. SO i don't see why you should have some. and i believe the guts of the two trannys are the same.

 

Why dont you ask your gay questions to someone that cares.
Say whats up to curious Crispy for me.

 

What the hell was up with that?


Anyway, I believe the only difference were the meshes in the reverse gear between series 4 and series 5 (I could be wrong) Though, if you go with the turbo tranny, you'll need the turbo flywheel/clutch/pressure plate as well. I'm not positive, but you may have to change counterweights in the front cover, but don't quote me on that, just something to check into first. That should be all, from what I can recall.

 

Only difference between S4 and S5 is the rear cross member mount. And, it's a straight forward bolt in exercise to mount the double ear S4 mount to a S5 tranny to maintain the same Tranny mount.

This was a N/A application, but same should be true for T2 S4 tranny into a S5 T2 and visa versa. Slave is different between a T2 and N/A. T2 Flywheel is bigger than a N/A. So to marry up your T2 tranny to a N/A engine you'll want to go to an aftermarket lightened steel flywheel to adapt one to the other.

Otherwise, N/A to N/a or T2 to T2, electronics are the same, clutch disk and pressure plate are the same, clutch slave is the same, etc etc.

 

This is not intended to take exception to the above post, but after doing some research can someone explain why Mazdatrix has different listing for '86/'88 & '89/'91 TII clutch info. I am aware of the different sizes of the stock factory disc which would explain stock clutch/pp difference (aftermarket the same), but they also list a different throw out brg. and even aftermarket flywheels are different.
I thought they were all the same.
Can anyone explain the dfference between the two?

 

Thanks for the replies everyone. Can anyone else confirm what was said above?

 

To be clear, my experience is only with N/A's. So, some level of assumption that same is true for T2's.

The only real difference between S5 & S4 is the throw out bearing. The S5 is slightly different in design primarily in thickness between where the fork meets the back of the bearing and where the bearing meets the pressure place "fingers". The S5 is somewhat thinner than a S4 in this respect. Why? No one including Mazdatrix seems to know. I do know that Mazdatrix has not hesitation to use a S4 Clutch set up in a S5.

What I do know for sure is that you can't use a N/A flywheel with a T2 clutch disc and pressure plate as the T2 clutch disc is wider. However, since the counterweight is built into the stock flywheel, you need to combine a NA counterweight with a T2 size aftermarket flywheel so a NA Engine can marry to a T2 Tranny.

If there are other subtle difference unique to T2 tranny's related to S4 vs. S5, I bow to the T2 Rotorheads to clarify.

Drive safe.

 

to clear a couple things up.

1. get an aftermarket flywheel and a clutch/pressure plate from the appropriate car as the tranny came from. in the case a turbo S4.

2. youl need a counterweight from an automatic of the same series as the motor, not the tranny. when u order the flywheel ask for this counterweight. its part of the deal.