Here are some potential options for transmissions that may be compatible with the engine and a rear-wheel-drive chassis:
* Isuzu 4WD pickup transmission: The Isuzu 4WD pickup transmission from the early 1990s is a 5-speed manual transmission that was used with the 1.6-liter turbo engine in some models. It should bolt up to the engine with minimal modifications.
* Toyota W58 5-speed manual transmission: The Toyota W58 5-speed manual transmission is a heavy-duty transmission that was used in a variety of Toyota models, including the Supra and Celica. It is capable of handling the power of the 1.6-liter turbo engine and should be able to bolt up with some modifications.
* Ford T5 5-speed manual transmission: The Ford T5 5-speed manual transmission is another heavy-duty transmission that was used in a variety of Ford models, including the Mustang and Thunderbird. It should also be able to handle the power of the 1.6-liter turbo engine and can be modified to bolt up to the engine.
As for the flywheel and clutch, you will need to find a combination that will work with the 1.6-liter turbo engine and the transmission you choose. This may require some custom work, but there are a number of aftermarket parts available that can be used for this purpose.
It is important to note that using a 1991 Isuzu 1.6 liter turbo engine in a rear wheel drive application will require significant fabrication and modification. It is not a straightforward swap, and it is important to ensure that the engine is installed and configured properly in order to ensure safe and reliable operation.