For one front wheel to spin is normal with a conventional differential up front. I'd expect the VCU inside of the rear diff to kick in and attempt to send power to the other non spinning wheel. That is the whole point to the rear LSD. Interested to see what others have to say about it. Have you tried draining your rear diff to see if the viscous fluid in the rear VCU has mixed with it?

J

 

It is possible depending on a few factors. Were both rear wheels off the ground? Of was the non-spinning one still on the ground? The VCU needs a bit of resistance on both wheels to opperate correctly (a disadvantage of a VCU). Thats why the manual tells you to apply a little bit of e-brake to get unstuck, because it makes resistance to the freespinning wheel, transferring power to the wheel that is not free-spinning.

 

my 92 still has a good limited slip. i got high centered a week ago, and both rear wheels spin and one front wheel spins.
but my friend with a 95 got stuck a few days later and only one rear wheel and one front wheel spinnin.

i know on supra if the real lsd gos out you get horrible in lift on corners.

 

ya same thing happened to me and a friend awhile ago after a snow storm. we went with a few other cars to mess around in the snow. my vr4, droptop awd converted eclipse, 2 wrx's. me an the eclipse got stuck and only 1 rear tire was moving. so we jus pushed it while i givin gas, same thing with the eclipse

 

my 91 vr4 with 80k miles spun both rear wheels but the stealth with 145k only spun 1. i think age is taking out all the rear diffs and we dont even know it.

 

It is possible depending on a few factors. Were both rear wheels off the ground? Of was the non-spinning one still on the ground? The VCU needs a bit of resistance on both wheels to opperate correctly (a disadvantage of a VCU). Thats why the manual tells you to apply a little bit of e-brake to get unstuck, because it makes resistance to the freespinning wheel, transferring power to the wheel that is not free-spinning.

Both axles were high-centered so there was minimal downforce on both rear tires. Thanks for the reminder about the e-brake...I forgot to try it. I hope it's simply an exception when both axles are effectively in the air as you suggest it may be. Given that some are experiencing the same while others are able to spin both rear tires, it would be nice to reach a definitive answer.

I haven't checked fluids yet and I don't notice any abnormal cornering behaviors. Can the LSD function fail without causing other collateral issues? Years ago during an emissions inspection they put my car on a treadmill thinking it was 2WD. After I noticed a severe clutch-like burning smell they came out to the lobby to ask me if my car was AWD...I was ready to strangle someone.

Thanks for the replies all.

 

It is possible depending on a few factors. Were both rear wheels off the ground? Of was the non-spinning one still on the ground? The VCU needs a bit of resistance on both wheels to opperate correctly (a disadvantage of a VCU). Thats why the manual tells you to apply a little bit of e-brake to get unstuck, because it makes resistance to the freespinning wheel, transferring power to the wheel that is not free-spinning.

As far as i know, the VCU is speed sensitive in that a prolonged difference in speed is usually enough to heat up the viscous goo inside of the VCU enough to lock it up the internal plates- which would initiate the limited slip action. Pulling up on the ebrake to transfer power to the non spinning wheel works on conventional differentials as well- and may help him get out of the jam, but should not be neccesary.

J