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What Gearbox Do I Have

t304vkcalais
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t304vkcalais Enthusiast

t304vkcalais

Posted
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but all the 25 boxes i have seen have the speedo sender near the middle of the box, if so what model is this box out of been told its a series 1 rb25 box.

also what power can these take and how do you modify the speedo to work as manual cable driven?

tim

Birds Grand Master

Birds

Posted
Posted

I think it may be out of an R34. I'm looking at an R33 RB25DET box right now and yes, they do have the speedo sensor in the middle of the box, along with different crossmember mounting points on the extension housing. Unless they changed these things from year to year on an R33?

The only other RWD boxes that use a similar box are the 300ZX and VL turbo, but they have different shifter setups to this one...they don't have the angled shifter housing.

Either way it's one of the big boys...people regularly run 300rwkw+ through these boxes without trouble...but that's all going to come down to how you drive and the clutch you mate it up to. You'll need an electric-manual adaptor for the speedo drive. These ones use f***in' magnets I think.

The Dan Grand Master

The Dan

Posted
Posted

I keep looking at it and the more I look the more different it looks.

It can't be Neo as it would have a pull style clutch which that one doesn't. It also has the speedo further back. I'll go take a pic and see if I can post one up of a 25 box.

The problem is that there is nothing to compare it's size to. If you had an RB20 box beside it, you would instantly know

The Dan Grand Master

The Dan

Posted
Posted

Yeah it must be S1 I think. Definitely RB25 though.

And OP, it doesn't matter which RB25 box it is, they all take the same spline tailshaft yoke same as Z32 300ZX

webber Proficient

webber

Posted
Posted

I wasn't going to reply here as i thought the experts would have nailed this...

There are only a few options, it is definatly an fs5r30a as people suggest.

For those a little slow...

Options are narrowed with sloped shifter housing:

Z31 FS5R30A with RB Bell housing - rear speedo drive.

2wd Navara box with RB Bell Housing (Pretty uncommon, required a bit fair bit of mod too)

VL TURBO MX7 - has less ribbing that is further apart - center speedo

R33 RB25DET - is push, looks about right but speedo drive is in the center

R34 RB25DET - Pull Clutch, speedo drive center - so ruled out

Z32 is ruled out because it would require full case change & is center speedo, which would make it an RB25 box.. lol

My opinion... I would say Z31 FS5R30A with RB (RB25) bell housing.

post-12420-0-32412800-1304868796_thumb.jpg

I seen that on another forum your after a speedo drive.

and if your looking for a stubby mechanical speedo drive i would suggest it would be 32703-31Gxx just from having seen them.

post-12420-0-91929800-1304868807_thumb.jpg

FAST Says Z31 is 32703-58sxx the difference between the 2 maybe (i think) the mounting clip/point ??? OR... maybe electric??

I am in the middle of a write up for my site ATM, so without digging through all the info i have gathered i can't be certain... PM me for more info, and i can find out.. too late CBF ATM...

COLOURS MEAN:

32703-xxx21 21 teeth (PURPLE) Ratio 4.375:1

32703-xxx20 20 teeth (RED) Ratio 4.11:1

32702-xxx19 19 teeth (WHITE ) Ratio 3.90:1

32703-xxx18 18 teeth (BLUE) Ratio 3.70:1

32702-xxx17 17 teeth (BLACK ) Ratio 3.545:1

32702-xxx16 16 teeth (YELLOW) Ratio 3.364:1

The red speedo drive in the pic you had: Your Post I would suggest is from an RB25DE gearbox from an R33 to have electronic speedo drive.

Birds Grand Master

Birds

Posted
Posted

Options are narrowed with sloped shifter housing:

Z31 FS5R30A with RB Bell housing - rear speedo drive.

2wd Navara box with RB Bell Housing (Pretty uncommon, required a bit fair bit of mod too)

VL TURBO MX7 - has less ribbing that is further apart - center speedo

R33 RB25DET - is push, looks about right but speedo drive is in the center

R34 RB25DET - Pull Clutch, speedo drive center - so ruled out

MX7 doesn't use a sloped shifter housing, it has a big flat one.

Didn't account for FS5R30A in a Z31 turbo...that could well be what this is. But that would mean that someone did an...engine out on a Z31 :P

Either way it's a mongrel of a box.

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