Hi to all, I'm new here, and I've made a presentation post in the new members section. I've looked for information here in the forum on what's my purpose to swap the diff case, but found nothing specific (I say sorry in advance if my search was wrong).
Coming to details: my E86 3.0si m.y. 2006 is manual transmission and brings a 3.46 final gear ratio on its 188k differential. My car is equipped with a Quaife ATB unit, which I find wonderful on the road and makes the job in trackdays also, with compromises to be accepted jumping on the kerbs, as everybody knows.
I'd like to switch to a 3.73 final gear ratio and considering to refit the stock 188k case with its open diff and keeping it a spare part for future use or to sell. So I was wandering if I could find a spare full 188k case from other BMW model fitted with 3.73 final drive in which fit the Quaife and completely swap the stock.
Keeping on E85/86 platform I know the only option is 2.5 s.i. with smg, and there's also something in 3.64 (which I consider too short difference to value the job).
Of course the possibilities to find a 188k from an E85 2.5 s.i. smg are quite unusual so I was wandering if there are other models which can match.
Standing to RealOEM quite all the E89 range has a 3.73 final drive and 188k...the rear cover have the same OEM code. Any of you knows if the diff case from those models has the same attach points and can be directly fitted on E86?
Thanks in advance and sorry if I wrote something wrong

Coming to details: my E86 3.0si m.y. 2006 is manual transmission and brings a 3.46 final gear ratio on its 188k differential. My car is equipped with a Quaife ATB unit, which I find wonderful on the road and makes the job in trackdays also, with compromises to be accepted jumping on the kerbs, as everybody knows.
I'd like to switch to a 3.73 final gear ratio and considering to refit the stock 188k case with its open diff and keeping it a spare part for future use or to sell. So I was wandering if I could find a spare full 188k case from other BMW model fitted with 3.73 final drive in which fit the Quaife and completely swap the stock.
Keeping on E85/86 platform I know the only option is 2.5 s.i. with smg, and there's also something in 3.64 (which I consider too short difference to value the job).
Of course the possibilities to find a 188k from an E85 2.5 s.i. smg are quite unusual so I was wandering if there are other models which can match.
Standing to RealOEM quite all the E89 range has a 3.73 final drive and 188k...the rear cover have the same OEM code. Any of you knows if the diff case from those models has the same attach points and can be directly fitted on E86?
Thanks in advance and sorry if I wrote something wrong
