XC92
Proven Member
- 1,573
- 362
- Jul 22, 2020
-
Queens,
New_York
I just read that in an AWD DSM with a VC LSD rear diff, which is what I have, if you raise the rear end and turn either wheel, the other wheel should turn in the same direction, and if it turns in the opposite direction then its VC LSD is shot and you either drive with an open diff or replace it.
Is this true, or is this only if say the trans is in gear, or in neutral, or all 4 wheels are raised? I tried this on my '92 Talon TSi AWD and the opposite wheel turned in the opposite direction when I turn each wheel. I just assumed that this was because with the front wheels down the prop shaft locked the rear diff so the opposite wheel had nowhere to go but the opposite direction.
Now I'm wondering if the rear diff and/or its LSD and maybe other driveline parts are shot. Is there a relatively simple way to check and confirm that all 3 diffs are ok, including the LSDs on the center & rear, along with the t-case and trans, at least in terms of basic power transfer?
E.g. by raising all 4 wheels on jack stands and putting the trans either in neutral or in gear and turning each wheel in either direction, or even running the car and putting it in gear? And is it necessary to detach the prop shaft per the FSM to overcome the resistance of the drivetrain even when in neutral, and any such test w/o detaching it is meaningless?
And yes, my Talon's rear diff has a VC LSD, with the orange sticker saying so and all, and none of the car's major driveline parts have been swapped, e.g. trans, t-case, rear diff--although come to think of it the trans was rebuilt under warranty a year or two after I bought it due to some gears being bad, but I don't believe they swapped its diffs let alone the rear diff.
I'm also assuming that ALL AWD DSMs had a VC LSD on the center diff.
Is this true, or is this only if say the trans is in gear, or in neutral, or all 4 wheels are raised? I tried this on my '92 Talon TSi AWD and the opposite wheel turned in the opposite direction when I turn each wheel. I just assumed that this was because with the front wheels down the prop shaft locked the rear diff so the opposite wheel had nowhere to go but the opposite direction.
Now I'm wondering if the rear diff and/or its LSD and maybe other driveline parts are shot. Is there a relatively simple way to check and confirm that all 3 diffs are ok, including the LSDs on the center & rear, along with the t-case and trans, at least in terms of basic power transfer?
E.g. by raising all 4 wheels on jack stands and putting the trans either in neutral or in gear and turning each wheel in either direction, or even running the car and putting it in gear? And is it necessary to detach the prop shaft per the FSM to overcome the resistance of the drivetrain even when in neutral, and any such test w/o detaching it is meaningless?
And yes, my Talon's rear diff has a VC LSD, with the orange sticker saying so and all, and none of the car's major driveline parts have been swapped, e.g. trans, t-case, rear diff--although come to think of it the trans was rebuilt under warranty a year or two after I bought it due to some gears being bad, but I don't believe they swapped its diffs let alone the rear diff.
I'm also assuming that ALL AWD DSMs had a VC LSD on the center diff.
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