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

12a tranny to 86+ 13b

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Old Jan 5, 2003 | 11:07 PM
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12a tranny to 86+ 13b

Well I'm currious if my starter motor will work on the engine.

I have a 12a 5spd tranny hooked up to a 86 13b block.

The starter is from an 89 motor.

It seems to bolt up fine... but I havent tried it yet.

Will this combo work or will I need an FB starter?
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Old Jan 5, 2003 | 11:57 PM
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Try it and find out!

There are two different 1st-gen starters, one with an 8-tooth gear and one with an 11-tooth gear. Since the flywheel diameters and starter cases are identical, the difference must be in the transmission case. FWIW my '80 had an 8-tooth, my '85 has an 11-tooth, and I don't know which year brought the change.
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Old Jan 6, 2003 | 12:40 AM
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I think it may work. My friend's 87 GXL's starter screwed up, and I gave him the one from my GSL-SE, and it worked. (I have a TII starter now)

Then again, they were both 13B's with the larger flywheels than the 12A cars...
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Old Jan 6, 2003 | 12:49 AM
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Originally posted by Directfreak
I think it may work. My friend's 87 GXL's starter screwed up, and I gave him the one from my GSL-SE, and it worked. (I have a TII starter now)

Then again, they were both 13B's with the larger flywheels than the 12A cars...
An 83+ 12A would have the same size flywheel too.
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Old Jan 6, 2003 | 11:52 AM
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All '74-up N/A have the same size flywheel.
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Old Jan 6, 2003 | 12:04 PM
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I've got an RX4 starter in my 7 right now.
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Old Jan 6, 2003 | 12:06 PM
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What year RX-7?

Specifically, what year transmission?
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Old Jan 6, 2003 | 01:33 PM
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would the 12a tranny bolt up to the t II 13b?
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Old Jan 6, 2003 | 01:39 PM
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Yes it would.

The T2 flywheel won't fit in the N/A bellhousing, though. You'd need to get an N/A flywheel for it (use stock flywheel from same year, or get a N/A lightweight flywheel).

Make sure to have a good stock of transmissions on hand. The N/A RX-7 trannies are fairly weak, especially the later ones which have bearing problems and fine-pitch gears.
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Old Jan 8, 2003 | 05:29 PM
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ok good, i just wasnt sure because of the 12a tranny if the 89 starter would reach the flywheel from the 86.
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