HELP: How to tell the difference Between RB20 and Rb25 Transmission?

[bkos90]

Months ago i saw a topic on how to tell the difference between the RB20 and RB25 transmission so you dont get ripped off. Im planning on buying an RB25DET in a few weeks but i really dont want them to rip me off by selling me an RB20 transmission. i tried searching everywhere but couldnt find it anymore. Help Please

[placham]

rb25det comes with fs5r30a trans model IIRC #'srb20det comes with fs5w71c trans model IIRC #'s

rb20det's trans looks like ka24/sr20 trans just different bell housing bolt pattern. You'll know once you see it, rb25 is much larger. And also ka24 drive shaft fits rb20's trans but will not work in rb25's(that's why you'll need cutom drive shaft for rb25 trans).

and all rb transmissions are interchangeable between 20/25/26/30, meaning their all one bolt pattern bell housings.

you should start using RB forum section for this type of info.