Does anyone know if you can swap out the internals of an Si tranny into other CRX/Civic trannies? Like into a DX or STD tranny?

 

Up.

 

dx and si are pretty much all the same gears except the final drive thats what plays the role in better punch off the line

 

he wants to know if he can use a DX transmission case to replace a broken Si Transmission casing.

 

There's a few different generations of tranny cases in the 88-91 cars. Some use a smaller diff bearing and some use a larger one. If the diff bearing is the same size between the cases, you'll be able to swap gears over.

I built my close ratio Zc gear/Si final drive tranny using the guts from a 91 CRX tranny, a JDM ZC tranny, and the case from my 4 speed 89 Civic STD.

 

I guess I will just have to try and it find out. I have heard of ppl rebuilding their DX trannies with Si parts. So I dont think it would be a problem.