Hey guys, I'm usually on the grand Cherokee forum because that's my rig.. My wife however has a 99 xj. I'm changing her manual transmission fluid for the first time and I'm reading confusing information about which fluid type. Can someone please CONFIRM the best and correct fluid type and amount I'll need?
Thank you? I'm sure this is a very common and aggravating subject.
I is definitely confusing. You are looking for a Gl-4 fluid. At sone point, Jeep switched to recommending 10w30 motor oil, but I have not tried that option yet. There are several options that should be pretty readily available. Stalube makes a Gl-4 gear oil. I got some at my local Napa.Royal purple makes a brass safe gear oil. On the back it will say safe for yellow metal. Redline MT-90 is GL-4 compatible. Amsoil makes a Gl-4 gear oil. I have been interested in trying the Pennzoil synchromesh.
Bottom line, you want a GL-4 75-90 gear oil. Don't put GL-5 in. It will do bad things to the brass synchros. I think some owners manuals were misprinted and indicate GL-5. My owners manual was one of those misprinted ones.
Pennzoil synchromesh should work wonders. Motor oil wouldn't hurt anything either. Just make sure you don't put in any gl5 fluid because your synchros will be toast
The 4.0L (6cyl) AW-4 Automatic Transmission uses Transmission Fluid labeled Dexron-III/Mercon. -Drain and Re-fill = 4 Quarts (3.8L) -Filter and complete fluid exchange = 8 Quarts (7.8 L) -2.5L (4cyl) Chrysler/Mopar AutomaticTransmissions use ATF+3 or ATF+4 Type 7176
Manual Transmission
Chrysler recommends that 10w-30 motor oil be used in XJ Cherokee manual transmissions.
Jeep owners report good results with Synchromesh fluid.
-AX-5 5 speed manual - 3.3 quarts 75W-90 GL3 or GL4 (NOT GL5or GL5 compatible as incorrectly stated in some Owners Manuals) -AX-15 5 speed manual - 3.32 quarts 75W-90 GL3 or GL4 (NOT GL5or GL5 compatible as incorrectly stated in some Owners Manuals) -NV 3550 5 speed manual - 2.1 quarts Mopar fluid part # 04874464AA or Synchromesh (meets Mopar MS-9224 specs)
The NLGI specs are important -typical NLGI GL-5 gear oil carries added sulphur used as an Extreme Pressure (EP) lubricant. Especially when heated, sulphur is antagonistic to yellow (copper-based) metals - and the synchronizer rings and any bushings in the AX-15 are bronze. Most synthetic gear oils are rated GL-5 and are listed as"safe for use with yellow metals."
Unlike API specs (to API Service SL/CJ-4,) NLGI Service specifications are not reverse-compatible.
If you want to use a synthetic (RedLine, AmsOil, etc.) either check the back ofthe bottle or check the manufacturer's website to make sure it's safe for use with yellow metal. Using sulphur-bearing gear oils usually results in draining your synchronizer rings at your next fluid change...
Transfer Case -NV231 Part-Time (Command-Trac) - 2.2 Pints (1.0L) Dexron-III/Mercon -NV242 Full-Time (Selec-Trac) - 2.85 Pints (1.3L) Dexron-III/Mercon
Thanks Tim. That's what I figured but it doesn't hurt to double check with someone more experienced than myself.
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