R33 Gearbox Project

[ix9]

Hi Guys,

I got an R33, RB25DET - the gearbox is whirring in 2nd, 3rd and 5th. Replaced the oil and all that - and its starting to get louder and louder! Ugh! (more $$$)

Here's my plan, help me out here tell me if its a shit idea or not.

1. Buy Good RB20 Gearbox cheap

2. Remove RB25 shagged box

3. Replace with RB20 Box.

4. Fix/Rebuild Gearbox as time/research/money permits.

5. Swap rebuilt RB25 with RB20 box again.

6. Sell RB20 Box cheap

I'm not pushing super-hp yet, but will be around the 350+rwhp after turbo upgrade soon, so the RB20box has to hold the standard 270-280hp that I've got now.

Installation considerations - I got access to workshop/hoist etc. I know the R33 boxes are heavy (like 70kg) so I'll get a few mates in on the deal.

I just need to make sure that EVERYTHING bolts up to the RB20 box, bellhousing, drive shaft, shifter, clutch slave cylinder etc.... Anyone done this before?

Cheers guys

-Kym.

[slip]

in R31's, you need to modify the tailshaft to fit the rb25det box, not sure about the gearbox crossmember. could end up being a bit of stuffing around.

might be a better idea to buy an RB25 box, even if its an NA one, because the resale will be fine and it will bolt straight in.

[dr00]

"standard" 270-280hp?

[R31Nismoid]

Not worth it, you gotta fart around with tailshafts

just go without the car for a week or two dude.

[shoei]

its a real b1tch removing and refitting a gearbox!!! why would you wanna do it twice?

[ix9]

OK let's rephrase this -

"Fix old box as time and money permits" - think longer term like a few months.

Ash - whats involved with the tailshaft messing around?

[R31Nismoid]

basically you'll need a different one

all the rooting around will cost you near on HALF of what the box itself will cost to rebuild.

if you drive it like a grandma till you can rebuild it, you'll save a good $700 in the long run

[BHDave]

Dont forget the different speed sensor required aswell.

[ix9]

OK anyone got any ideas what a RB25 box rebuild is worth?

Being that I'll prolly need new synchro's and bearings etc...

[R31 POWER]

Speak to Bayley Kym.

[al_r33]

JUSTJAP sell new ones for $3200.. i bought one of them instead of rebuilding as it was cheaper! i think it was 4000 for the rebuild. dont hold me to it thow

[stuartlaw_78]

Mate,

i'm no expert here but it sounds like you got a little ripped off! They reckon $4000 for a rebuild?? What the hell are they putting in it??

JUSTJAP sell new ones for $3200.. i bought one of them instead of rebuilding as it was cheaper! i think it was 4000 for the rebuild. dont hold me to it thow

[Bl4cK32]

Yer $4000 is way off.

$1600 here in Adelaide for a full bearing and new syncros for every gear. That price includes the $600 in labour to do the whole job.

[T04GTR]

yeah 4k WTF 1k-1500 is on the money.