What are the options for using RB25 tranny on S13

[justfortest]

I am researching to get the info to have RB25 tranny to SR20DE for S13

I heard there is an adapter for it. Has anyone try it ?

Also, is it really worth doing it ?

I just want to get around with the gear ratio. Stock ratio is kinda weird to me...


Thanks in advance.

[1eightySX]

This may be too little too late but from what I can tell is not too many people go the RB25 transmission.

It would seem that most people upgrade to accommodate increased power but that is usually done by people he beat on their cars. The recommendations for the upgrade usually point to the Z32 transmission but that would require and adapter and a new drive shaft.

It can get a bit pricey.

[reeskm]

Depending on your power requirements, there are many options available:
- shot peen gears on stock trans and/or cryo treat parts
- upgrade to Z32 trans
- upgrade to RWD RB20/25 trans (should be same as z32 trans)
- upgrade to 6 speed Nismo unit
- upgrade internals using parts from OS Giken, JUN or another reputable shop
- upgrade to dog or sequential Hollinger transmission (super costly but super strong)
- go to a junkyard and get another 7S5W71C trans from any other nissan truck or car and keep blowing them up