M90 240

[Tony1990]

Hello there so after blowing 2 m47 boxes up in a month I've bought a m90 I'm looking for any advice on fitting this in my 240 please if any one has any I'd greatly appreachiate it

[230ina245]

Hi
If you're careful and take the clutch slave cylinder out of your M47 before you remove it from the car then you can put it in the M90 when it's in. Saves disconnecting the slave and bleeding it etc.
Before you put the box in you will need to shim out the pivot ball a few mm. The plastic cover that fits on the pivot ball will probably have disintergrated so have a new one ready.
You'll need to reduce the length of the gearstick support and actuator link to get the gearstick in the right spot in a 240.
You will also need a spacer to fit between the gearbox output shaft and propshaft.
Depending on which box you have (the paper sticker telling you this is usually missing) you may want to strip the box down and weld the 3rd gear syncho support ring. I'd also change the oil while it's easy to get at.
There's several threads around detailing how to do it. I've probably forgotten a few steps. Take your time and allow twice as long as you think it will take.
Tim

[Bugjam1999]

I’ve got an m90 in my 240. You’ll need to:

Shorten the gearstick linkages by 100mm (one is alloy, one steel)

Reduce the width of the bracket holding the rear end of the alloy gearstick linkage so it’ll fit inside the narrower 240 tunnel and find a way of attaching it to the tunnel top (I welded on an m6 bolt and drilled a hole in the tunnel in the correct place

Lengthen the front half of the propshaft by 50mm/or find a bolt on spacer (I think Lucas mods sell one)

Get a clutch to suit the m90 gearbox - the spline count is different to an m47. Depending on your power goals, a turbo diesel clutch from an early 940 may be all you’ll ever need.

Cheers

[classicswede]

Shorten gear linkages by 100mm
Lengthen prop by 50mm
Use m90 bracket adaptor
Space out pivot ball by 5/6mm or use the lengthened version
Replace the plastic ball cap for the clutch fork
Clutch use the dog dish M90 clutch or go with the TTV flywheel conversion
Oil use the redline MTL https://www.classicswede.org/shop/re...mtl-75w-80-gl4