Transmission question.....
11-07-02, 05:59 PM
#1
Transmission question.....
Well, I really want to put FB gears into my FC tranny, but I have never taken a transmission apart before, so I really have no idea what to do, or how to do it. I was wondering if there were any write-ups, or how-tos anywhere that someone could lead me to. And also, how difficult is it to swap tranny gears? Would it be possible to just take the two trannies to a shop and say, " put these gears into this tranny"? Or is it straight forward enough that I can do it myself? Thanks
11-07-02, 08:50 PM
#3
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if youve never seen the guts of a tranny, its not simple. a tranny shop would probably be able to do that but i doubt you could do that by yourself. all gears are press fitted where they need to be. its not just nuts and bolts. unless you have the equipment to do it, your best bet it to take it to a tranny shop
--eric
--eric
11-08-02, 09:51 AM
#4
actually, only the bearings are pressed on and you can put them back in place without a press. the hardest thing about rebuilding a transmission is getting the bearings off for one bearing you need a puller that has arms about 20 inches long (you can fabricate arms to use with puller).
11-08-02, 11:35 AM
#5
Oh, ok thanks. Also, I have one more question. What gives transmissions their strength, is it the internals, or just the housings?? I ask because Im planning on a nitrous setup for my N/A, and of course I need a stronger driveline. Would putting FB gears into the T2 tranny make it less strong?
11-08-02, 12:24 PM
#6
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Rxmfn,
Haha, I just finished doing this! Actually, it's easier than you might imagine, once it's out and on the bench. No need to pull gears off shafts and stuff. The tranny is made up of three major sections: bellhousing, maincase (containing all the gears), and extension housing off the rear with the shifter turret. If you look at the factory parts manual it will make sense (mazdaformance.com). Also check the online service manuals. The FB and FC trannies share most details, like bellhousing bolt pattern, overall length, 5th, neutral switch locations, etc.; and differ in details like rear crossmember mount, shifter location, vents in bellhousing. There are some good threads on this forum and net info on doing this, so do some searches.
Here is an abbreviated description of what you want to do:
Use the FB maincase, with the FC extension housing, incl. tranny mount, and shifter. The FC control rod will fit the shifter fork rods without problem. Note when separating the extension housing - remove the speedo gear, 5th and neutral switches first, and don't reinstall them until the housing is back together.
The bellhousing you use is a matter of choice - my FB was from a 12A and did not have the vents that the 13B has, so I figured the increased heat and power of the 13B warranted the switch to the FC bellhousing. At any rate, you'll need to break all the sections apart anyway, because once you pull the extension housing, the forward seals will relax enough to start leaking / weeping (speaking from experience here). Note that special tools are required to separate the bellhousing from the maincase. You'll need to rent / borrow a 'FWD hub puller' (it's got a deep cup shape to it) and using a couple of the extension housing (long) bolts threaded into the front cover holes, pull and hammer on it until they separate. Note you will be pulling the mainshaft bearing off the input shaft when you do this, you have to remove the snap ring for it first (another tool you'll need - snap ring pliers). You can drive it back on with a hammer and block of wood. You'll need some replacement parts to reassemble as well - plan on replacing the front cover gasket and input shaft oil seal, the rear oil seal (tailshaft), new speedo gear O-ring, and you'll have to re-seal with RTV the case sections and shifter inspection plate. New throwout bearing might be advisible. You will probably need (I did) have to use the FB speedo gears, as the shaft gear for FB is coarse tooth, and the FC is fine tooth. Anyway, the gear ratio of the speedo gears relates to rear end ratio and tire size - and the FB and FC are within 2% of each other anyway.
I've only put about 15 miles on mine so far, so can't comment much on the differences. Certainly it revs faster - the gearing is shorter. Mine ('84 12A) is like a 4.3 rear in first, 4.5 in second, 4.3 in third, 4th is still 1:1, and 5th is way shorter (.807 vs. .697).
As for FB - TII, they are not related nor interchangable. But FC, FB, miata, RWD 626 are all same basic center section.
Good luck
Curtis
'86 gxl autox'r
Haha, I just finished doing this! Actually, it's easier than you might imagine, once it's out and on the bench. No need to pull gears off shafts and stuff. The tranny is made up of three major sections: bellhousing, maincase (containing all the gears), and extension housing off the rear with the shifter turret. If you look at the factory parts manual it will make sense (mazdaformance.com). Also check the online service manuals. The FB and FC trannies share most details, like bellhousing bolt pattern, overall length, 5th, neutral switch locations, etc.; and differ in details like rear crossmember mount, shifter location, vents in bellhousing. There are some good threads on this forum and net info on doing this, so do some searches.
Here is an abbreviated description of what you want to do:
Use the FB maincase, with the FC extension housing, incl. tranny mount, and shifter. The FC control rod will fit the shifter fork rods without problem. Note when separating the extension housing - remove the speedo gear, 5th and neutral switches first, and don't reinstall them until the housing is back together.
The bellhousing you use is a matter of choice - my FB was from a 12A and did not have the vents that the 13B has, so I figured the increased heat and power of the 13B warranted the switch to the FC bellhousing. At any rate, you'll need to break all the sections apart anyway, because once you pull the extension housing, the forward seals will relax enough to start leaking / weeping (speaking from experience here). Note that special tools are required to separate the bellhousing from the maincase. You'll need to rent / borrow a 'FWD hub puller' (it's got a deep cup shape to it) and using a couple of the extension housing (long) bolts threaded into the front cover holes, pull and hammer on it until they separate. Note you will be pulling the mainshaft bearing off the input shaft when you do this, you have to remove the snap ring for it first (another tool you'll need - snap ring pliers). You can drive it back on with a hammer and block of wood. You'll need some replacement parts to reassemble as well - plan on replacing the front cover gasket and input shaft oil seal, the rear oil seal (tailshaft), new speedo gear O-ring, and you'll have to re-seal with RTV the case sections and shifter inspection plate. New throwout bearing might be advisible. You will probably need (I did) have to use the FB speedo gears, as the shaft gear for FB is coarse tooth, and the FC is fine tooth. Anyway, the gear ratio of the speedo gears relates to rear end ratio and tire size - and the FB and FC are within 2% of each other anyway.
I've only put about 15 miles on mine so far, so can't comment much on the differences. Certainly it revs faster - the gearing is shorter. Mine ('84 12A) is like a 4.3 rear in first, 4.5 in second, 4.3 in third, 4th is still 1:1, and 5th is way shorter (.807 vs. .697).
As for FB - TII, they are not related nor interchangable. But FC, FB, miata, RWD 626 are all same basic center section.
Good luck
Curtis
'86 gxl autox'r
11-08-02, 01:09 PM
#7
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hmm i know mazdaspeed7 has a fb tranny into his fc. cause i was asking him about this conv. and he sayed i had to use the fb tranny i think and use the fc tailhousin. cant really remember. adam u there???
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