Hi everyone,

I have a question about the ASD (hydraulic locking differential) which was optional on a number of 124/140/201 diesels. From the EPC and service manual info, it *appears* that the ASD diff acts as a normal limited-slip diff until the computer decides to apply hydraulic pressure to the external collars, then allowing 100% lockup. Normal LSD only gets to something like 20-40% lockup, I believe, depending on the tension of the thrust washer pack (adjusts with different thicknesses).

So, if someone has a car equipped with ASD could you do a test for me? Jack up the rear end so both wheels are off the ground. Put the tranny in neutral and turn one tire. Observe if the other tire spins the opposite direction (open diff), or the same direction (indicating limited slip function). Or, if anyone knows FOR SURE how it works, that would be fine. Right now there are a number of different claims & speculation that aren't matching up well. I'd hate to buy a used ASD diff, expecting to get cheap LSD by swapping that in, only to discover it doesn't work...!




Best regards,

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Dave
Boise, ID
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