Rear differential VCU. Good or Bad - 3000GT/Stealth International Message Center
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Old 03-15-2010, 01:33 PM   #1 (permalink)
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Default Rear differential VCU. Good or Bad

I know that questions about the rear LSD VCU are redundant, but I am not sure of my evaluation.

Originally, I did the front and rear VCU test with the engine, transmission, and drive shaft connected. I came to the conclusion that the center VCU was bad and I changed it when I pulled the transmission.

I also came to the conclusion that the rear VCU was bad, but now I am not sure.

My drive shaft is removed from the car. The car is jacked in the air without tires exposing the rear wheel hubs. There is no "load on the rear wheel hubs. If I turn either hub forward, the opposite hub rotates forward and the and the drive shaft hub turns. If I block one wheel hub with a crow bar, I can still turn the other wheel hub but with some resistance. The drive shaft hub also turns.

What do you think. Is the rear LSD VCU good or bad?
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Old 03-15-2010, 02:11 PM   #2 (permalink)
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Default Re: Rear differential VCU. Good or Bad

It sounds usable. Perfect? I really doubt it. Unless you're racing your car, I doubt you'll notice any issues. Mine is pretty much shot, and I don't have any traction issues, even auto-crossing.
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Old 03-15-2010, 02:31 PM   #3 (permalink)
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Default Re: Rear differential VCU. Good or Bad

as long as turning one side makes the other side go in the same direction I'd call it ok.

IMHO I'd rather have the rear spin anyway because that puts less stress on your transfer case.
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Old 03-15-2010, 03:46 PM   #4 (permalink)
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Default Re: Rear differential VCU. Good or Bad

I guess I'll leave it as is then. I was kind of dreading tearing the rear differential apart. I already have a heavy work load on this car with the engine and transmission torn apart.

BTW. I easily removed the U-joints from my drive shaft using my dremel tool to grind off the staking and a hammer and chisel to knock out the joints. I just hope I can find some replacements. I got a guy in Ohio from Driveline trying to match some up. Fingers crossed.
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Old 03-15-2010, 04:17 PM   #5 (permalink)
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Default Re: Rear differential VCU. Good or Bad

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Originally Posted by Beau_Jester View Post
I guess I'll leave it as is then. I was kind of dreading tearing the rear differential apart. I already have a heavy work load on this car with the engine and transmission torn apart.

BTW. I easily removed the U-joints from my drive shaft using my dremel tool to grind off the staking and a hammer and chisel to knock out the joints. I just hope I can find some replacements. I got a guy in Ohio from Driveline trying to match some up. Fingers crossed.
hell man you were in the other thread with me a couple years ago, it is:

precision j-joint 399.


Drive shaft U Joint question
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Old 03-15-2010, 05:37 PM   #6 (permalink)
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Default Re: Rear differential VCU. Good or Bad

Forrest, you have a better memory than me. I forgot about that thread.

That thread was back when I first bought the Stealth RT/TT and I was getting my "to do" list together. The car has basically sat in my driveway for two years untouched. I am kind of starting from scratch again, fixing things as I find them. As I pull parts off I find more problems.

I had to let this project sit because I blew the differential that year and the engine the next year in my base 3000GT. I put all my time getting that one running again. Now it is running good and I can finally get the turbo car going. It should be running by summer.

Thanks for providing that U-joint part number. I looked it up and it is a hollow U-joint. I was hoping to find a solid performance U-joint similar to what is currently installed. If I can't find one I may have to go that way. Problem is I am going for 450 AWHP and I am not sure a greasable U-joint will hold up.

Last edited by Beau_Jester; 03-15-2010 at 06:32 PM. Reason: revision
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