can i fit an e30 m3 box on to an m20b25?

[midnight]

as title states, and if so is the s14 box stronger etc.?

[Jhonno]

no it isnt, and why would you want to? £500+ for a box as opposed to £100

[maxfield]

The M3 box is a Getrag 265, which is rated to 265NM of Torque, where as the M20 Box is rated at 260NM of Torque.

But in reality I can't see there being much difference.

[reggid]

The M3 box is a Getrag 265, which is rated to 265NM of Torque, where as the M20 Box is rated at 260NM of Torque.

But in reality I can't see there being much difference.

They are able to take a whole lot more than that.............where did you get that rating?

[johnl320]

The clue is in the name of the gearbox

[Ant]

S14 box onto M20 is a non-no

M20B23 dogleg would fit, but its weaker so why bother ??

Leave it as-is Kev, fix it when it breaks, it Wont

[jaistanley]

I have a high mileage 325i gearbox on mine. I changed the oil and forgot to add the transmission vinration damper when putting it together. Rattles a bit at idle but still as sweet as a nut, even with the bashing I give it!

I always (through habit) double de-clutch and heel and toe and use the driveline to deccelerate more than the brakes too and it's fine with that n all. I guess the double declucthing will give the synchro's a slightly easier mind.

[maxfield]

Yes, I know they can take much more.

But, if I'm mistaken, didn't Getrag give the boxes these ratings?

[e21Jason]

A m3 box into a m20 no probs

The us spec 528ie manual came with the 265 box and a detable bell housing, ask some one on m3tech or another us forum to source a bell housing, then you just need the box.

I sold my set up about 5 years ago to racer in the kumho at the time.

But is you want a box upgrade use one from an m50 cheaper

Jason

[jaistanley]

The trouble I can see with using the E36 boxes is that the canter of the engine is different so you'd need custom linkage and gearbox support wouldn't you?

[Ant]

^ easily done Jai, works fine the other way around.

linkage will tweak in a vice, and the cradle is an easy fix with a mig and some 40x40

Dont see the point though,Stock box easily hacks 400HP in good nick, and as Midnight owns my old SE now, that box is 100% pukka

Good info on the Bellhousing Jason

[e21Jason]

hi

A custom gearbox support is an easy mod compared to tracking down a 528e belhousing, or mega expensive denrith

Or use a 525tds box, or some early m20 e34 520' came with a later gearbox but i can rember the spec of the of of my head.

Jason

[Dave_M3]

I'd love to get hold of an S50b32 box for the is

[midnight]

alright guys thatnks a lot for the info its just that i got offered one and was just curious whether it was a worthwhile swap. so ill allow it but thanks again