Dam that stumpy box is much shorter !!! the photo with the box fiitted in the ute is that the standard 1200 box tunnel ?

Are you running the Maddat fitting kit ? How does the box shift at hight rpm ......and did you end up fitting the speedo cable to the stumpy box ?

Difference in length between Stumpy and S13 gearbox



S13 gearbox fitted into 1200

ive used a stumpy in mine. It came on the l20b that was in my ute when i purchased it. I thought it would be the "easy" route.
Had to change to ca bellhousing and also change one of the bearings. No drama there. Just a little research on what bearing to use etc etc
I also went this way as i thought it would save me some time and $$ in tunnel mods as i cant weld and i outsource this.
All well and good getting the engine in the car with the gearbox attached. Gear stick lines up perfect.
But......cannot remove/service gearbox without engine out or cutting hole in firewall to back the bellhousing bolts out. I've also had trouble with a speedo corrector box to fit next to my gearbox crossmember.

Mmm it's looking like I'm going to have to some trans mods !! I'll try an hunt down an auto tunnel and fit a standard ca18det box !

Or just put up with a crunching stumpy box lol !

RB engines were mated to different gearboxes
* FS5W71C - same as the S13/S14 Silvia gearbox, except with RB bolt pattern
* FS5R30A - RB26, RB25DET and Skyline 4WD applications, stronger and heavier

71C gearbox for RB20 can be used with other engines (e.g. CA18DE, KA24DE, SR20DE, VG30) by partially disassembling the gearbox and swapping the front half of the case it can be used on the other engine.

If you can find the 1200 tunnel from a 71-series automatic (L3N71B), it will go into the ute and you can still use the heater. You don't need to change the tunnel, but it makes gearbox installation easier.

Interesting ! I never though about an Rb box ..... Basically I'm trying to get away minimal trans tunnel modification ....

The Rb box would be bigger box compared to the stumpy box ? I would have to Do a tunnel change ?

S12 and stumpy boxes are getting very thin on the ground if you need to replace one. Ca would be easiest to source but you might even be able to then use rb box with the ca bell housing I think. Or is that for Sr?

In your opinion do you think it's worth cutting and beating the trans tunnel up to fit the 71 series box ? Or use a stumpy box ? I have read that the stumpy is a hard shifter at high rpm ...

The stumpy box lines up in the 1200 perfectly.

With any 71-series gearbox it is a tight fit and some hammering & cutting is required. Some 1200s came a 71-series tunnel, coupes & sedans.