If I put the crx si tranny in my 88 crx hf crx, will my 88hf axles fit in the tranny?, I know i need a si flywheel clutch combo.

 

Yes, your axles will work fine.

As for the clutch, make sure to use a clutch for the year of the vehicle that the tranny came from. If it is an '88 trans, use an '88 clutch. If it is a '90-91 trans, use a '90-91 clutch.

 

If your chassis is a HF you will need to use HF axles. They go right in the trans no problem. HF's have smaller outer CV's so you have to use HF axles with HF hubs. If you chassis is a DX/SI will need DX/SI axles....