RB20 Transmission Rebuild Help

[Kingtal0n]

I thought the RB20 and sr20 trans was very similar or the same?

I also remember a transmission from an RB25 laurel (4-door) that definetely has sr20 transmission parts inside it

I have an automatic from an RB20 R32 I just pulled out for a powerglide...

[Rustys14]

Originally Posted by Ashchetum

I actually have a rebuild kit, I'll PM you

Awesome, I just replied

Originally Posted by Kingtal0n

I thought the RB20 and sr20 trans was very similar or the same?

I also remember a transmission from an RB25 laurel (4-door) that definetely has sr20 transmission parts inside it

I have an automatic from an RB20 R32 I just pulled out for a powerglide...

They are very similar. As far as I can tell the bearings and seals are identical in the RB20, SR & KA transmissions, but comparing them the 2nd, 3rd and 4th gear syncronizers aren't compatable. I believe the syncros are the main difference aside from the RB casing being about 4 inches shorter in overall length.

Replacing the box with a new RB25 box (or something more stout) from Nissan has crossed my mind since they're easy to source and not all that expensive considering its a brand new OEM transmission. But then I'm down the rabbit hole of needing a new driveshaft, trans mount and having to modify my harness which I'd like to avoid. I don't plan on making more power than the RB20 box can handle so sticking with it makes the most sense from a time/money standpoint if I'm able to source the parts to rebuild it.