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Originally Posted by drmiller100
I did some quick research. I have NOT played with the 944 transaxles, but the 911 transaxles from that era you can swap the drive and driven gears for pretty easy overdrive.
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It was very possible to do with the 901 boxes, but those were only used from 1963 through 1971 in the 911, and through 1976 in the 914. The 1972-88 911s used the 915 gearbox, and I have not heard of people flipping the gears around on those.
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On the 911 gear boxes, you usually can't change first gear which is fixed to the main shaft.
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The five-speed 901-based gearboxes had second gear fixed to the main shaft. Unless you get a 904 main shaft, which is serious cubic dollars, even in Porsche terms. The 915 did not have any gears fixed to the main shaft.
None of the 911 transaxles will work easily in a 924/944/968 or in a 928, for that matter. And none of them will hold up to 400+ HP (with a healthy big-V8 torque curve at least!) under heavy use. The 901s tend to detonate when you put more than about 250 lb-ft through them; the 915s are better but still not great. The 930 gearbox could be an option to hold up to the power, but it needs work to flip it around for use behind the engine. Machining of the diff housing so you can flip the ring and pinion, for example. Or run it upside down.
It may be worth looking into the later 928 transaxles. They are set up to run off a torque tube, and they can hold up to a reasonably healthy V8 motor. I don't know what, if any, alternate gear sets are available. The early 928 boxes are not well regarded as far as shifting and durability, so I'd probably avoid those.
The 968 might also prove a reasonable donor for the transaxle, but again I don't know what alternate gears are available.
Some Google searching will turn up info about the existing gearsets in different years of 924/944/968 cars. In general, the later ones will be stronger and the turbocharged cars will have stronger ones. And I'd be worried about the strength if the thing is hooked up to a healthy V8.
-soD