Trackin'. I'll go ahead and just drain it and pick up some fresh fluid, just to be safe, as soon as I get it back on the ground here in about an hour. I just got paid by Googitube so I've got the cash, and it doesn't take 5 minutes.

 

Just called Advance and she looked up my order of transmission fluid and it was described in the computer as Valvoline 75W-90 "Synpower" full synthetic oil. I'm gonna run down to the store and look up that item number and see if it's the one with the limited slip label on it.

 

This is how it is described on Valvoline's website... Looks like it includes friction mod for LSD.

SynPower® Full Synthetic Gear Oil

Formulated for ultimate protection and performance

• Contains additives to assist in protecting gear teeth
• Maintains excellent low temperature fluid protection down to -50°F (-46°C)
• Provides outstanding thermal stability for cleanliness and longer service life
• Contains special additives to reduce chattering in limited-slip differentials
• Recommended for (conventional and limited slip) manual transmissions where an API GL-5 or MT-1 fluid is specified
• Protects parts from rust and corrosion
• Compatible with conventional gear lubricants

 

You're missing the point. The transmission does NOT take "gear oil" of any kind, limited-slip or not. It takes special manual transmission lubricant and there are only a few brands that are approved. Pennzoil, Royal Purple, Red Line, and Mopar are the only ones I'm aware of and even then, it MUST say "syncromesh" or something like that. If you're not sure, get it from the Dodge dealer.

Those fluids are NOT specified for the NV3500.

 

Went to Advance and every single bottle of 75W-90 there has friction modifier. Valvoline, Royal Purple, Mobile 1, Lucas, even the Autocraft (store brand) all said, "For use in manual transmissions, hypoid differentials, contains friction modifier, etc."

I'll double check Car Quest tomorrow just out of curiosity, but I'm guessing there's no such thing as 75W-90 without friction modifier any more.

Also I checked just to be sure, mine has the AX-15 transmission (3.9L engine).

We DO have a brand new Chrysler dealer that opened up, may give them a call and check on this whole issue tomorrow as well.

 

Available at Advance. I think this is what you need.



http://shop.advanceautoparts.com/p/p...il+synchromesh


Pennzoil Synchromesh Manual Transmission Fluid is designed for certain manual transaxles and transmissions used by GM and Chrysler. Provides excellent oxidation stability, low-temperature performance and synchronizer performance.

 

In the AX-15 you can use 75w-90 - BUT NOT a GL-5 oil.

You can use 75w-90 GL-3 gear oil. GL-5 IS NOT COMPATIBLE.

Good luck on finding a GL-3 gear oil nowadays. Syncromesh fluid is fine.

There's more to an oil than it's weight. Don't trust the guys at the parts store. All they know is what the computer tells them.

 

I'm not positive what the AX-15 takes, but I seem to remember from my days of owning a Jeep that it can use gear oil, as long as it's not GL-5. I would still call the dealer, though.

*EDIT*
Dan beat me to it.

 

From allpar

http://www.allpar.com/mopar/transmissions/NV3500.html

The AX-15 uses 75w-90 GL-4 or Redline MT-90 If I remember correct they say that Mobile-1 75w-90 is bad for the AX-15 as it eats the syncros but its been in my AX-15 8 years with no problem.

Bad info is everywhere always do your own research and double check

 

Found 3 bottles of this today. Haven't put it in yet. The MOPAR part number listed on the bottle is different than the one listed in the instruction manual. Is this the one you were talking about?

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