im sure this has been brought up before, but my trans in my NA car is just crappy. The shifter has about 3 inches of play when its in gear and i dont think it could be any more vague. And its not the shifter bushings either, i replaced those. the linkages are shot. So i was thinking of slaping in a T II trans, but why stop their? can a FD trans fit in a FC? will the engine bolt up? is the shifter in the right place? Is the speedo read from the trans? i dont care of the drive shaft is shorter/longer, thats no prob. and where can i get one.

 

Your answer.
https://www.rx7club.com/forum/showth...3rd+gen+tranny

 

Is the FD trans alot stronger than a TII trans?

 

Not according to my sister and her FD where the tranny imploded at 65k miles

 

Do yourself a favor and just get a TII tranny. The FD transmission will cost more, and it's not really much of an upgrade. I think the case is a little stronger.

 

he said he has an NA FC. A tii tranny will not bolt on to a N/A. you will need the half shafts and what not. Plus the Tii tranny is much heavier. Just get a rebuilt N/A tranny (which is cheaper than having someone rebuilding it for you, or buying a nu tranny). Also i heard that you could put some FB gears in there to get quicker acceleration

 

The TII tranny will bolt up to a NA 13b.

 

the TII tranny is about #30s lighter. I had both and weighed them.

 

Can't you just use the T2 driveshaft and redrill the pinion flange on the N/A rear diff to the T2 bolt pattern? I remember seeing that somewhere...

 

I guess you could, but it will make it just that much weaker. Maybe weld the holes shut on the pinion flange and then redrill them for the TII shaft. Or just use an N/A auto shaft.

 

The FD and FC Turbo trannies have nearly identical guts and design, but the bellhousing and many other parts of the design are different. Regardless, they're both VERY strong trannies - the tranny blowing up on the 3rd gen is not normal, BTW.

Anyhow, to the original poster, did you replace the plastic bushing that goes in the slot on the shift lever's ball? It's commonly overlooked and accounts for a LOT of slack.

Dale

 

If your going to bother swapping the tranny, you may as well just go ahead and swap the rear diff too. Its not difficult. Then you can just use a TII driveshaft You also need a TII flywheel, clutch, and counter weight. A TII drivetrain can take anything a NA can throw at it.

 

I meant redrill 45 degrees out of phase... so the new holes are nowhere near the old ones.

I dunno about the auto shaft, isn't it something like 5 inches shorter than what you'd need?

Of course, you could always just relocate the engine backwards the necessary few inches

 

if your gonna do it do it right sheez swap everything.

 

wells, not exactly, u need flywheel, clutch and clutch disc, starter, probably the Tii slave cylinder, and driveshaft modifcation. (welding the flange to the driveshaft) If you dont wanna modify the shaft get the Tii driveshaft along with the tii diff.

 

um, nope you got that backwerd. The tii tranny is about 30lbs heavier than an N/A tranny. That explains why the Tii tranny can support twice as much HP as an N/A tranny and is much more stronger.

 

But the transmission will physically bolt to the engine.

Another thing you can do is hunt down a '74-78 bellhousing. That way you can use the N/A flywheel, starter, etc and just get a T2 adapter clutch disc (N/A sized but fits the T2 input splines)

 

ah, well I misunderstood. u jus need to buy a whole bunch of other ****, then it will bolt on.

 

my question is...why bother? i dont recall ever hearing about N/A trannies blowing up so why upgrade it? just replace it with another N/A tranny. i could be wrong but ive just never heard of the N/A trannies being troubled areas. hell my friend beat the ever loving dog **** out of his GXL and the tranny never even flinched.

 

besides everything in front of the transmission.. alls i would need would be the driveshaft and diff? what about the axles?

 

1st-gen types blow up trannies left and right. I know of a certain GSL-SE that went through three trannies in a year... kept shearing 3rd gear.

FC N/A trannies are the same internals, only FCs make more power and are heavier. I'm SURPRISED that FC N/As don't eat trannies more often than they do. (Maybe they're saved by people doing half-assed mods that decrease power... <ducking, running> )

 

exactly, jus get a N/A tranny, and swap in the FB tranny gears in. I think just the 1st and second gears will swap in. Then when your done, you need to ShIfT mAd FaSt Yo!?!?

 

Break gears mad quick

You can't swap individual gears, except for 5th and Reverse. The countershaft and the countergears for 1st, 2nd, and 3rd are all one solid chunk of metal. (4th gear isn't a gear at all) That bg ole' shaft presses through the center bearing assembly and 5th and Reverse slide on the opposite side.

Swapping FB gears into an FC can best be described as pointless effort, unless you REALLY want RB gear ratios. It's the same junk in an FC N/A tranny as in an FB tranny, and a Miata 5-speed tranny and some pickups and other RWD cars as well.

Just as pointless as swapping an FD tranny in place of an FC Turbo tranny - same internals, just slightly different case. Only, the FD tranny is really unsuited for anything but an FD since it requires a pull-type clutch. Mazda beefed up the thrust bearing assembly and under-front-cover assembly to handle the added abuse of the pull clutch. Could you make it live without having to rebuild your engine to FD spec? Probably. But then, some people also manage to make N/A trannies survive behind turbo engines, or at least, they don't mind the breakage.

 

I blew a NA tranny. My fault though, tranny had 230K on it and I KNEW the pilot bearing was shot! wnet to pass a Semi and pulled 77 from 2 to 3 and BLAMMO!!!. Blew the main bearing!. Pineapple racing can build you a stout enough NA tranny.

 

no, u have it backwards, i just recieved a TII tranny, with packaging it weighed 86lbs said so on the packaging info. I shipped my old n/a tranny and with a crate it wieghed 135lbs. I figured the crated wieghed like 20, it was just small plywood.