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Old 04-17-2014, 02:51 AM   #1
hotmilk400
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Default Help determining a differential

Hey all,

I have two differentials that are already removed from the cars. I thought they were both open, but one might be posi/lsd and i wanted help determining. The reason I ask is one spins in the same direction while the other spines in opposite directions. No S on either.

The one in question is a 4.44 from a 97 auto. The tag reads 444v7092

When you spin one side, the other sides spin in the same direction.

From the previous differentials I sold, this should indicate that this is posi/lsd. I dont have the vin of the car anymore, its been awhile since I had it.

The other is a 3.45 from a 96 manual, and it spins in opposite directions.

Any reason why these too differentials act different but neither indicate why? Is there a way to tell the difference if I open them? if so, what am I looking for? thanks in advance
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Old 04-17-2014, 03:36 AM   #2
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Excellent post by CoolJess about what the different diffs look like when you take the cover off. That'd be the easiest way to be certain.

http://www.318ti.org/forum/showpost....4&postcount=91
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Old 04-17-2014, 03:49 AM   #3
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Thank you, this is exactly what I was looking for.

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Update:

Despite the two differentials turning different, opening them reveled that they are both open. I would say that that the direction of the shafts spinning is NOT a good way to determine if a differential is open or LSD. The lack of any attached wheels, which causes resistance, could have played a factor in this but everyone should keep this in mind while buying an LSD. If the differential is removed from the car, you should look for an S or open the case.

Thanks a lot
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Last edited by hotmilk400; 04-17-2014 at 08:02 PM.
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