Which diff?

[kdevitt]

Working through an M60 swap into a narrow body Z3 - need to start figuring out the diff to use (running a 420g as well)

The 188 is the easiest option in terms of fitment (would need to use E30 325i half shafts) but is a 188 up to the task?

210 from an E24 / E28 was also suggested- but it’s a bit more custom and potential headache in future if needing to replace bits.

Bearing in mind I’m getting old and won’t be driving like a hooligan - is the 188 the sensible option or one I’ll regret??

[flybynite]

Working through an M60 swap into a narrow body Z3 - need to start figuring out the diff to use (running a 420g as well)
The 188 is the easiest option in terms of fitment (would need to use E30 325i half shafts) but is a 188 up to the task?
210 from an E24 / E28 was also suggested- but it’s a bit more custom and potential headache in future if needing to replace bits.
Bearing in mind I’m getting old and won’t be driving like a hooligan - is the 188 the sensible option or one I’ll regret??

B30 or B40? They used a 188 on the Z3M with the S50B32. The problem wasn't the diff but more so the boot floor pulling apart.

My gut feeling would be a 188 with some sort of twin-ear back plate conversion and floor strengthening which is what I may do on my M54

[kdevitt]

M60B40 - doing the twin ear conversion and boot floor strengthening too. Reading conflicting opinions on whether the 188 is up to the extra torque. Figured it’s what the majority are using - a 210 swap would be a bit of a pain from the sound of it.