2.47 LSD in 3.07 open housing with 3.07 gearset?

[Mighty190]

Will this work? Everything is w126 210mm stuff.

[Frank Reiner]

Ring gear spacer required.

[Mighty190]

Ok that's not bad. Is there a good place to get them?

[97 SL320]

You would likely need to make one from steel that is ground on both sides or redrill one from a more common car. Check places like Jegs / Summit and some rear end gear / trans parts vendors. The thickness can only be found by mocking the gear up with washers as spacers.

It is absolutely critical to make sure the ID of the ring gear is still on the register of the diff carrier otherwise the gear will bind / wear out.

[benzevo124]

What car did the LSD come from?


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[Mighty190]

The LSD came with a R107 parts car that I bought but the carrier is a w126 carrier with a r107 cover. No idea what this originally came out of.

[whipplem104]

I do not know if you know the cost of rebuilding one of these lsd units and that they are pretty crappy lsd units to begin with and do not last very long. You are better off just getting a Quaife or wavetrac. They are a bit more money. You can buy them for the 3.07 gear set and they will last for ever and work better.

[Mighty190]

I have not priced this out and what makes them bad? I know the brakeaway torque is pretty low stock but I wouldn't mind putting in a stiffer spring from something else like ford 8.8 or whatever happens to work. I like that I have this LSD unit already and I would not pay the premium for an aftermarket lsd.

[Raffaelli]

I've never seen a Mercedes LSD unit, but it's probably clutch discs and a spring setup just like a fords 8.8

Whenever I regeared my mustang, I used two sets of clutch discs and packed the sucker as tight as it would fit. It was a pain to assemble, but had enough bite to chirp the tires in low speed turns for the first couple thousand miles.

I would try doing this if possible to your Benz unit.

[Frank Reiner]

Originally Posted by Mighty190

I have not priced this out and what makes them bad? I know the brakeaway torque is pretty low stock but I wouldn't mind putting in a stiffer spring from something else like ford 8.8 or whatever happens to work. I like that I have this LSD unit already and I would not pay the premium for an aftermarket lsd.

Originally Posted by Raffaelli

I've never seen a Mercedes LSD unit, but it's probably clutch discs and a spring setup just like a fords 8.8

The Benz LSD is indeed a clutch type, but there are no springs. The initial preload is set with one selectable friction disc per pack. Additional clamping force comes from thrust between the differential pinions and the side gears. When the friction discs wear to a certain point the side gear bottoms against the diff case, and at that point it becomes an open diff on the worn side.

[benzevo124]

You can install a spring block inside the lsd to apply constant pressure to the clutches as they wear.


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