m42 gearbox

[viliusE30]

Hi, im about to replace my m10 engine with m42(from e36), got kinda evrything i need, exept prop shaft. so i got question- e30 m42 gb is same as e36 m42 gb ? or difrent length? i might be able reuse my propshaft if thay are same, Thanks for anwsers

[bumpygt]

Main bit is different gearbox ratio, e36 use around the 3.45 area.
Not sure on exact lengths between e36 and e30 iS gearboxes.
If you use the e36 gearbox the compact prop and small case diff would work
Easiest option is m42/40 clutch m40 gearbox m40 prop and 3.91/4.10 diff all easily avalible.

[viliusE30]

as i said i got all parts 3,91 diff already in from m10, i just couldn't get e30 m40 prop then i would be using m40 box (and e30 m42 propshaft is rare as unicorns), soo if e30 wiki isnt lying m42(e30 org 318is) and m10 prop is almost same lenght, and if e36 and e30 boxes are same size, it should fit, so i was hoping if anyone can confirm it before i check it hard way

[bumpygt]

I can check the length of my m42 prop this evening

[viliusE30]

well last night we puled out m10(4 gears) engine annnnd this morning took out propshaft and it is ~160 cm not sure if it will fit :/ will find out when we slam in m42 with gb

[viliusE30]

can i shorten prophasft by pushing it together im middle by loosening the collar nut?

[age]

yes you can

[AdamGardner]

I have an m42 engine with an e36 direct top ratio gearbox fitted. I loosened the nut and slid the prop up slightly to get it to work

[viliusE30]

well as my m10 gb was 4gears propsh was way too long so ended finding e30 m40 gearbox and prop, and car is runin but driving at 120 km/h and having littil bit over ~2.5k rev (maby less) is normal or my m10 clustter is troling me? (diff ratio 3.91)