Rb25 Box Or Rb20/sr20 Box With Gear Set, Which Would You Use?

[works 510]

Guys,

The Rb20 is abit ill, I have a 25det ready for installation.

Rb25 will just have a 2535,injector upgrade, intercooler and 3" turbe back exhaust, so not massive power but enough to start wrecking 20 box's.

Options are:

a rb25 box, most likely a secondhandie from either a wrecker or forum (1k to 1500) or even one straight out of japan.

or

my Rb20 box or even a sr20 box (with bellhousing change) using a OS giken/jap brand/ppg/whatever 3 gear set.

Im sure I would be able to come close to getting a gearset in a rebuilt box for not far off the price of a rb25 box + tailshaft

Have a few mates that work for various companys..

Now: If it was you, which would YOU use? Or have you already gone down this path before, if so, explain your reasons.

Im trying to figure out a good balance between cost, reliability and availability of a gearbox that will last.

Im not sure on how strong a gearset will even be compared to a stock r33 box, anyone care to give me some examples, power and what sort of driving wise?

Pritty much asking as a rb20 box is factory fitment,meaning no tailshaft mods or xmember mods, and I already have one to use as a base..

Thanks

Dan

[RedDrifter]

I dont't know for sure but have a search on the net in regards to the sr box. The bellhousing will swap over but I beleive it is 1-2 inches longer than the RB20 box despite being the same part #.

Can anyone else verify this?

As for a RB20 box being built up with ppg/os internals i haven't seen any listings for the 20 box all just the sr20?

[BHDave]

you're looking at 2k for a second hand 25 box, shaft and install if you can do it yourself vs around 5k for a rebuilt 20 box with internals done (retail obviously) Your mates can get you a gearset and output shaft (don't forget shafts as they are the next thing to go after 3rd gear) plus install for 2k?

A 2535 equipped rb25 will not break a 25 box unless you are seriously ham fisted and have no mechanical sympathy.