any info about putting 5th gear from FD into FC tranny ? (higher top speed, better economy at highway)

My 3rd gear grinds and i think i should rebuild tranny over the winter and while at it, put 5th gear from FD into it.

I need to know which parts i need to order to fix 3rd gear problem, what new gaskets i should order and finally where to order 5th gear from FD for it....

thanks for any input, url's and part numbers would be great ;o))

thanks

 

dont do it.. the 3rd gens have the same problem

 

im not sure but im not so sure that a tranny rebuild is a do it yourself type job...

well i guess thats just me for all i know you can do it perfictly fine

 

this forum really sucks, no answer or totally useless answers at all....

are there any knowledgeable ppl on this forum or not anymore ???

 

for some rwason i dont think the fd 5th gear will fit. i know when the fd guys put the lower gears its a gearset from an 87-88 b2600 truck.
also if its a turbo tranny, you need the factory puller set to get it apart, its not easy like the n/a's

mike

 

The FD gear will fit but your syncros will have the same problem they have. With a drastic jump in rpm from 4th-5th you'll increase the wear on that syncro. Now, if you have a light flywheel or are really good at waiting for RPM matches, it shouldn't matter.

 

I know it will fit, i and i don`t have problem with 5th gear syncro...but i need to know what exactly is involved with swap, what parts (part numbers) i need and where to get them (for how much $$$)

 

what i was tryin to say earlier.. is that even if u wanted swap the FD 5th gear synchro or an FD tranny.. sooner or later youre gonna run into the same problem.. because I think the FD has an even worse problem than FC have with that 5th gear synchro that is usually caused by harsh or 2 quick or not pressin the clutch all the way in when shiftin from 2-3..... hope that helps.. and if u do it.. the 5th gear in the FD is slighty shorter i think.. so cruisin rpm's would be changed

 

rebuilding transmissions is generally a PITA and NOT recommended for a do-it-yourselfer. It's harder than rebuilding an engine, or just as hard, at least. also, individual parts are often worth more than an entire used transmission.

It's really not worth the hassle just to get 1-2mpg, if that.

 

PLEASE stop telling me what is worth and what not, i want FD 5th gear for reason of different ratios, better economy, higher topspeed.....not to fix worn synchro, my 5th is going in without any problems....

answers i expect are something like this :

u need :

5th gear and 5th counter gear

R523-17-610 $160.12
R524-17-308 $92.84

prices from mazdaformance.com

 

you need the 5th gear and the 5th gear on the countershaft. you should also change the 5th gear synchro, and maybe the hub if its bad. plus the two bearings you press off. mazdatrix, or mazdaformance, or your dealer (the auto palace) can get the parts

mike

 

faster and cheaper than getting it at Mazda dealer in Czech Republic is flying for it to USA....seriously....

Mazda CZ does not know what RX-7 is, how to fix it...been there, talked to them and they really don`t know what are rotaries about.

I have spare TII tranny, mine starts to have worn out 3rd gear synchro so i will have to rebuild it....it is cheaper, faster and easier to rebuild it than get another one here in CZ....and since i have spare one, i don`t need to rush with it, i`ll take my time and do it right, i just need to know what to buy, where and for how much....for both, fixing 3rd gear synchro and upgrading to 5th gear from FD.....

 

u need :

5th gear and 5th counter gear

R523-17-610 $160.12
R524-17-308 $92.84

You seem to already know what you need. Why ask our input? And I know you don't have a 5th gear syncro problem, but is could become a problem later with this swap.
Also, I seriously doubt that many FC guys have done this swap. However, I would like to have the FD 5th gear. But if my trans ever goes I'm just gonna swap a G-force or something similar. I had an AWD talon and I know what a bitch it is to have shitty transmissions. Just go straight to the good stuff.

 

Simple answers.

If you have a TII... don't bother. There difference in gearing is something like (-.003)

If you have an N/A... try and get a 5th gear from an 86'. They have a .637 vs. every other years' .711 and it would be a much easier swap (out with the old, in with the new) because both are Type-2.

 

i knew sumone with a tII who wanted to do this but he didnt and tol me it was cauz of a reason like wut he sed. i didnt really understand wut he meant but im sure they both are tlkin bout the same thing.

 

i knew sumone with a tII who wanted to do this but he didnt and tol me it was cauz of a reason like wut he sed. i didnt really understand wut he meant but im sure they both are tlkin bout the same thing. ill try an get into contact with him cauz im sure he knew wher to get parts from.

 

from few ppl i have information that difference is noticable TII 5th vs FD 5th, i want to have it confirmed.....i mean 260 vs 300 km/h top speed or something like that.....

 

i tried emailing him but i guess he changed his email ad cauz it says his account is full. i knew him like a year back. sry tho.

 

:Apoligizing:

I, in fact, am WRONG. The 5th gear in a 5-speed is .697 vs. the TII's .711! That's quite a difference.

I'm sorry that I couldn't help you out with problems or ways to go about the switch, but I didn't want to spread misinformation. Sorry about that.

 

and FD ratio ?

 

anyone ? i need to know for sure....

its been said topspeed S4 TII topspeed (theoretical) will go up from 165 mph to 180 mph upgrading to 5th gear from FD

true or not ?

 

bump

 

FD = .697
TII = .711

same 4.10 R&P

Sorry, I thought my apoligy post got it's meaning across.

 

i would just swap the 4-6th gears to londer ones, personally i would want a car to be fast through 3rd and then have a pretty high top speed...

 

Liquid anarchy...your ratio numbers are cool, but my question is about top speed affects....