Rb20/25/30

[wlspn]

I currently have an RB20 in my R32 but will soon be changing to either an RB25 0r 30. Do these 3 blocks share the same bellhousing pattern? i have an R33 manual box which I plan to recondition, put behind the RB20 for now & then leave it in when the engine gets swapped. Can I do this? Also how bout clutches? Any difference? Cheers

[blind_elk]

I have a R32 GTS4, with a RB25DET sitting in front of the standard (R32) gearbox, and (I believe) a RB20DET flywheel and clutch.

[Travis Trayhern]

all the same bolt pattern not sure about the flywheel/clutch, got rb30det with the rb25 box and a few less gifted of a brain down my way thought it would be smart to build a rb30det with a rb20 box because they are so cheap which lasted a week. so they all bolt up dude

[bubba]

Yes they all bolt up. I'm running an RB30DET, had an RB20 box behind it, now an RB25 box. Also had the same clutch behind my RB20 as I now have behind my 30 (and clutch originally came off a 25).

Edited June 12, 2008 by bubba

[GTS4WD]

+1 for all the same..

32 gts4 box, rb20 and 25.

[BigC1988]

I'm about to swap my RB20DE with a RB25DET. With the RB20 gearbox on the RB25 will I have to mod my tailshaft (the stock on the R32)????

[R32Abuser]

they all fit, but that sed if your going from a RB20 to a RB25, it isnt advisable to put a torquier motor infront of an inferior gearbox (RB20 box). The torque will eventually rip the box apart.

[BigC1988]

they all fit, but that sed if your going from a RB20 to a RB25, it isnt advisable to put a torquier motor infront of an inferior gearbox (RB20 box). The torque will eventually rip the box apart.

À friend of mine just told me that the gearbox wont hold the HP of the engine (planning on boosting 20psi). So I will use the RB25 gearbox. What should I do??

Thanks for the help

[bubba]

You should search. There are a few threads that detail how to go about putting a 25 box in a 32.

Oh and boosting 20psi means nothing. What turbo are you using?

[BigC1988]

I currently have an RB20 in my R32 but will soon be changing to either an RB25 0r 30. Do these 3 blocks share the same bellhousing pattern? i have an R33 manual box which I plan to recondition, put behind the RB20 for now & then leave it in when the engine gets swapped. Can I do this? Also how bout clutches? Any difference? Cheers

The bellH (r33) will fit on a RB25 but the clutches are diffrent if its turbo/ non turbo.

The clutches of a non tirbo are smaller then the turbo.

I have a rb20 bellH (non turbo) with RB25 clutchs and it fit.

[BigC1988]

You should search. There are a few threads that detail how to go about putting a 25 box in a 32.

Oh and boosting 20psi means nothing. What turbo are you using?

Still cant find any good guides

Now I have a T28. Planning to go GT35

[GTS4WD]

R32 boxes start to strip gears and do in bearing at about 240 odd kw depending on what life the box has had.