What's the difference between ASD (automatic slip differential) and LSD (limited-slip differential) ?

My understanding is that ASD has hydraullic-lines to the diff, while LSD is self-contained within the diff.

I believe they are also NOT interchangeable. That is, if your car has a LSD, you can't install an ASD instead, and vice-versa.

Can someone please confirm?

Thanks,
:-) neil
1988 360TE AMG (with 3.07 LSD, looking for a 2.87 LSD)
1993 500E (looking for a 3.07 ASR)

ASD is computer controlled limited slip.
ASD is Automatic Sperry Differential.
They aren't interchangable.
They do "almost" the same thing.l

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Does the 1999 C43 AMG come with the ASD differential?

__________________
Marc
C55: Evosport headers & UDP's; AMS crank; TVT thermo; phenolic spacers; Denso IK16's; EuroTech ECU; RennTech cf airbox w/ Green filters; Z06 catch can; Sprintbooster; Optima RedTop; Quaife LSD; AMG: shift paddles, 030 rear calipers & rotors; Rotera brake lines; Euroteck CF lip; "C63" rear diffuser; 18" SLK AMG Turbines (summer); 18" OZ Superleggera's (winter); K40 dual f&r radar w/ laser jammers; MB: digital climate control, iPod kit & mp3 CD changer; iTronic B/T for MOST.

LSD is ASD (acid) !!!

I finally got a complete answer from another Mercedes list:

As my source I am quoting (with minor edits) from:

1993 Sales Brochure - The 300 Class,
MB Pulbication MC-92-103-200

"The Automatic Locking Differential (ASD) operates automatically at speeds
below 19mph to limit wheel slip. ASD is a computer controlled, variable,
hydraulic-locking differential which redistributes power away from the
slipping rear wheel.... ASD is available on the 300D 2.5 Turbo Sedan."

"The Automatic Slip Control (ASR) system uses both throttle and brake
control to reduce whell spin during aceleration. Below 24mph, if wheel
slippage is detected, the brakes are applied to either or both rear wehels.
If wheel slippage continues, the engine is then automatically throttled
badck until traction returns. Above 24mph, the engine is throttled back
before the brakes are applied. ASR is available on all 300 Class vehicles
except the 300D 2.5 Turbo and 4matic models, and is standard on the 500E"

Hope this helps,

Kevin Kenner
Seattle, Washington

:-) neil
1988 360TE AMG
1993 500E