m42 / 318i gearbox questions

[Alburglar]

I have an m42 engine on a 318i getrag gearbox. Can I use this for an m52 conversion?

Also I have a great LSD from an IS. Can I keep my small case diff and prop? Has anyone done it or will the gearing be ridicoulous? is that the only reason people swap to large case diff and prop?

[blue30]

I've got a 318 box on the back of my M50, using a 320i linkage and prop. Gearing wise nothing will change if you're keeping the same bits. Personally I've no experience of the small case diff strength wise on an M52 though.

[town325i]

A 4.10 diff will be no good for a M52B28 gearing will be no good at all

[E30BeemerLad]

I'm using a 3.91 LSD from a 325 on my conversion with the iS gearbox and it's a little busy at motorway speeds, acceleration is quite lively though.

Ideally I'd be looking for a 3.64 or 3.73 LSD.

The iS LSD is quite rare so you'll probably get a decent price for it, enough to get a better ratio LSD swapped in there

[Alburglar]

ta everyone