Quote:
Originally Posted by bradleyland
I can't imagine it's a technical limitation, just that it's expensive. I don't know if this is true for the M135i, but at some point (can't remember the year), BMW started welding the ring gear in the 135i diff, so you can't just swap out the components; you have to replace the entire diff and ring gear. It ends up costing close to $2,500 for a LSD, and that's just for the part.
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Yep. I've had it explained to me as 'machining off the end and welding the diff in place and putting it back together again'. The outfit who would do this for me say its a 5-day operation. But once it's done it's undetectable without opening it up. And those numbers are pretty close although over here it would be the same figure in £.