1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12A transmission options

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Old 09-19-12, 01:47 PM
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12A transmission options

My syncros are nearly gone from 3rd down into 2nd.

I have access to a few 13b S4 and maybe S5 N/A transmissions. Will they bolt on? Are the mounts the same, and shift location?

Needs to fit onto my 12a.
Old 09-19-12, 02:38 PM
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the S4 is easiest, it just needs the FB tailshaft housing swapped over.
Old 09-19-12, 02:40 PM
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Originally Posted by j9fd3s
the S4 is easiest, it just needs the FB tailshaft housing swapped over.
Which is super easy.
Old 09-19-12, 09:21 PM
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A lot of the tail shafts between the Mazdas can be switched around. I have a '79 RX7 tranny in my MG with an '80 B2000 (yes pickup truck) tail shaft. Moved the shift way forward.

ok, that was a whole lot of useless information for this board.....
Old 09-19-12, 09:53 PM
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Originally Posted by Rotary-MG
A lot of the tail shafts between the Mazdas can be switched around. I have a '79 RX7 tranny in my MG with an '80 B2000 (yes pickup truck) tail shaft. Moved the shift way forward.

ok, that was a whole lot of useless information for this board.....
Not useless!!

I've been wanting to make a rotary truck, and a B2000 is now a prime canidate.... Although, it would be easyer to locate a Ford ranger or B2200. Do you know if the tranmissions are the same on those?
Old 09-19-12, 10:40 PM
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also, the speedo gear needs to come over with the housing, right?
Old 09-20-12, 10:12 AM
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Will the length be the same? I just had a new driveshaft made. :S
My race car doesn't use a speedo. So I'm assuming it's not necessary.
-Is the overall length of the trans the same, and
-what is the purpose of the tailshaft swap?
My 12a is in a Corolla, so the shifter position doesn't matter for my specific usage.
-Do they use different driveshaft splines?
Old 09-20-12, 03:28 PM
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You'd have to change the mainshaft to change length for the driveline.

If it's just a tail housing swap, then the lengths are the same.
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