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Discussion Starter · #1 ·
Okay I need to know if the 03 tranny needs the Friction Modifier when I do the tranny fluid replacement. I will be replacing it with the stock Mopar+4. Just need to know if it needs fm. thanks in advance.
 

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I think the guys with LSD use it. I have it in my car. SOme say to use the penzoil one who makes it for GM which is hte best one out. Others say to use what mopar recommends etc.
 

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Discussion Starter · #3 ·
I understand that the 04s with the LSD need the FM but does the 03 non lsd tranny need it to thicken up the mopar+4? The penzoil stuff is called snycromesh or something right? Thanks in advance
 

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The friction modifier is for the quaiffe, and is not needed in a non-quaiffe equipped 03 transmission.
 

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Doesn't the Mopar ATF+4 include a friction modifier? The Shop Foreman at my dealer showed me a syncro ring from the tranny that had a special surface facing on the inside of the syncro ring. He said that surface was was designed to slip then grab and required the friction modifier to function correctly.
 

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haljensen1 said:
Doesn't the Mopar ATF+4 include a friction modifier? The Shop Foreman at my dealer showed me a syncro ring from the tranny that had a special surface facing on the inside of the syncro ring. He said that surface was was designed to slip then grab and required the friction modifier to function correctly.
Original thread person is talking about the additional 4 ounces of friction modifier required for use with the LSD in the 04 (and retrofitted 03) transmissions.

DCX strongly advises the use of the specified fluids in their transmissions. Anything other than Mopar ATF+4 can invalidate the transmission warranty. Because the fluid is not a consumable item like engine oil, brake pads, tires, and other stuff covered by the MM act, they can specify the correct part for the transmission.
 
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