rebuilding 5 speed...what should be replaced?
 

what exact parts should be replaced during a rebuild of the transmission?

Im guessing the syncros and all the bearings. ARe there other seals or things that should be replaced? I just want to make sure that the shop I take it to replaces everything they should. Thanks!!!

Yes to everything you said. Seals are cheap the first time around. Inspect the fifth gear assembly well including the gear itself, syncro, and slider. These parts take a beating if there were any missed second to third shifts, (second strait to fifth). Second gear syncros take some punishment if you do any hard shifting. Second, third, and fourth use a "double syncro". They're usualy pretty robust but check them for cracks or rounded teeth. Do youself a favor and use Redline MTL trans fluid after rebuild, much better shifting as a result. I believe the Mazda Website is offering some synros for the third gen at close out prices. I'll try to find that link if you'd like. Good luck!
RACRX

oh if you have that link it would be great. I have redline synthetic in my diff for the last 18 months.

Try this link, click on clearance items, scroll to near bottom of page and you should see them. Free shipping on clearance items. You might want to compare prices with Ray @ Malloy Mazda 1-888-533-3400. Might be close. Hope this helps.
RACRX

http://www.mazdaformance.com/rx7.htm

who is rebuilding it? are they good? how much?

I thought it was just 1st, 2nd & 3rd gears that had the double torque sensing synchros?

After referring to the factory service manual, we're both wrong. It's just second and third that get the double torque sensing syncros. Sorry for the bit of miss info.
RACRX

Hey Zero, how bout you take the 8 to the shop, have them drop both trannys, and put them side by side.

This way we will finally know the differances between both and raise or lower the possibility of a 6 speed in an FD :D

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the 8 sucks ;)

sure you gonna pay for that? LOL.

actually you dont want an Rx-8 tranny in your FD. Sure the Rx-8's tranny is modern, smoother, precise and feels 150 times better...but...

Its a miata tranny and the same tranny as in the Japanese Is300. These tranny's start to break after about 250 RWHP. FD tranny's while crude and often difficult to engage are bulletproof.

if you want to do it right you need.

all the bearings
all the seals
all the synchros
the pilot bearing

the following should be looked at for likely replacement
1&2, 3&4, and 5&r hubsets, as they wear too
the cone and enguagement teeth on the gears themselves


why would you want an r8 tranny? its like 5x more shifting, and your rpms on the freeway will be higher

Eww. Nevermind then.

its actually considered the second best manual shifter gearbox, next to the s2000. Believe me, if you could get one in the FD you would love it. The problem is its not strong enough to support alot of Torque.

So that I don't have this massive power gap between 4th and 5th gear like we do know when shifting around 140mph.

Why do you think the Supras (and anything else with high HP and a 6 speed) are such highway kings? They are able to keep their RPMs within the max hp area when shifting in the upper gears.

Redline 4th then go to 5th. You'll wish you had another gear to get you 1000rpms closer to the sweet spot, and STILL have a final gear to go to get you even higher up in speed. Maybe you just haven't been up there enough times ;)

I really like it, too. But reverse was a little tricky :p:
You should have seen me at the dealer LOL. I kept going into 6th and bogging it out :p: I can't remember if I had to push a bit further out or if I just had to push down then out, but no one bothered to tell me this :confused:

ROTFLMFAO, after I bought my car I went to back out and I kept stalling. I asked the dealer and he is like...You have to press down. I guess its necessary because of the 6th gear thingy.

the sad thing is I had a 99 miata for like 3 years with the 6 speed and completely forgot.