Several folks here have done it.
I will also be doing it this winter.
IMHO, the easiest swap would be to whatever tranny was standared in the manual version of your particular car.
Having said that, most any Fiero tranny can be used in any Fiero.
It really all depends on your motor.
The Isuzu was never used with a V-6, but lots of people are using them with V6s. They seem to work especially well with 3.4 swaps, and are waaay cheaper than Getrags. Getrags are stronger, but are really overkill for a 4 cylinder engine.
4 speeds are fairly common, and will work with anything. Lots of people prefer the gear ratios/spacing of the 4 speed, anyway.
You will need to install the pedals, master cylinder and lines. I belive the lines are routed in pretty much the same location as the auto trans cooler lines.
You'll need different mounting brackets and axles. All manual Fiero axles are the same.
You'll need a shifter. All 5 speed shifters are interchangeable. All 4 speed shifters are interchangeable. They are not interchangeable with each other.
You will need the appropriate shift and select cables for your particular tranny. They are all different.
You'll need the appropriate slave cylinder for your particular tranny. Again, they are all different.
You'll need the correct flywheel for your engine. If you have an 88 V6 engine, get a flywheel for a 3.1 Beretta. It will work just fine and be much cheaper than the 88 specific flywheel.
You'll need to make some wiring changes. I haven't researched that yet, so I'm not sure what all will be needed.
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Raydar
88 3.4 coupe...........
Coming soon...
88 Formula, presently under the knife.
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