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Discussion Starter #1 (Edited)
Just got back from the dealer, and have resolved at least one question. Both the service writer and one of the mechanics told me that only the rear diff. requires 4oz of friction modifier. They said any brand would be OK. There are some sort of clutch plates in the rear end (viscous coupler?) that require the additive.
They were wrong, see my next post below!!


Also the transfer case (J 140) requires ATF+4, any other is something else(didn't ask)

BTW, this is for my 2006 3.7, hope this helps.

EDIT-Picked a bottle up today, about $8.


 

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Discussion Starter #3
Got the word from the horses mouth today. I sent an email to chrysler.com yesterday regarding the friction modifier additive, and here is the response...

Dear Chris:

Thank you for contacting the Chrysler Customer Assistance Center
regarding the rear differential for your 2006 Jeep Commander.

According to our records, your vehicle was equipped from the factory
with a conventional rear differential. This type of differential does
not require the use of a friction modifier.

Chrysler recommends using Mopar synthetic gear lubricant SAE 75W-140.

Thanks again for your email.

Sincerely,

Joe

Customer Service Representative
Chrysler Customer Assistance Center


So the dealer I spoke to, once again, is WRONG!!:mofo:

I changed the diff fluids yesterday, and it looked like an open diff to me. I am accepting this as the final answer for my JC.

Case closed.
 

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I love being right!
 

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i posted some in the for sale section under parting out
 
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