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Old 06-18-2013, 09:12 PM   #1
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How much and what weight on gear oils

Ok I want to do my stick shift trans oil and my diffs what should I use and how much and what weights it's a 97 TJ with 2.5L stick shift

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Old 06-21-2013, 11:29 AM   #2
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I have a copy of the service manual; here is what it recommends:

MANUAL TRANSMISSION
AX5 . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 L (3.3 qts.)
AX15 . . . . . . . . . . . . . . . . . . . . . . . 3.15 L (3.32 qts.)
TRANSFER CASE
COMMAND-TRAC 231 . . . . . . . . . . . 1.0 L (2.2 pts.)
FRONT AXLE
181–FBI . . . . . . . . . . . . . . . . . . . . . . 1.2 L (2.5 pts.)
REAR AXLE
194–RBI . . . . . . . . . . . . . . . . . . . . 1.66 L (3.5 pts.*)
216–RBI . . . . . . . . . . . . . . . . . . . . 1.89 L (4.0 pts.*)
* When equipped with TRAC-LOK, include 4
ounces of Friction Modifier Additive.

LUBRICANT SPECIFICATIONS
A multi–purpose, hypoid gear lubricant which conforms
to the following specifications should be used.
Mopar
t Hypoid Gear Lubricant conforms to all of
these specifications.

The lubricant should have MIL–L–2105C and
API GL 5 quality specifications.

Lubricant is a thermally stable SAE 80W–90
gear lubricant.

Lubricant for axles intended for heavy-duty or
trailer tow use is SAE 75W–140 SYNTHETIC gear
lubricant.
The 181 FBI axle lubricant capacity is 1.2 L (2.5

pts.).

RECOMMENDED LUBRICANT
Recommended lubricant for AX5 transmissions is
Mopar
t 75W–90, API Grade GL–3 gear lubricant, or
equivalent.
Correct lubricant level is from the bottom edge, to
no more than 6 mm (1/4 in.) below the bottom edge of

the fill plug hole.

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Old 06-21-2013, 12:22 PM   #3
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On that friction modifier note... 99% of the gear lubes already have the required friction modifier so don't add more separately unless you know specifically the gear lube you are using does not have it. And that friction modifier is only (!) needed if your rear axle has a Trac-Lok limited slip differential.

It is hard to find a gear lube without that friction modifier since it is compatible with all axle types.

Your axles are not all that fussy about the exact viscosity gear lube so long as it is a GL-5 gear lube. Use a lower viscosity like 75W-90 or 80W-90 for most conditions. If you tow a trailer, use a heavier viscosity like 80W-120, 85W-140, etc.
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Old 06-22-2013, 08:36 AM   #4
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My Chilton's book recommended 75W-90 so that is what I put in it and my transmission. Also, my rear differential had a tag stating I needed to add the friction reducer. Must be I have a Trak-Loc differential. How would I know otherwise, is there something on the build tag or VIN that would tell me?

The gear oil I purchased clearly stated that it was for anti-slip top-off only, so I added the friction modifier.

Thanks for the info Jerry.
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Old 06-22-2013, 10:35 AM   #5
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Your gear lube stated what? That it was for anti-slip top-off only? The label said that? Exactly what is that wording on the label? It's not advised to add additional friction modifier if the gear lube already contains it which most do.

If your glove compartment has a label inside advising caution with the Tracloc limited slip differential, that would combine with the label on the axle to effectively confirm you have the Tracloc (aka various other ways to spell it).
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Old 06-23-2013, 03:55 PM   #6
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I purchased Advance Auto Parts 75W-90 synthetic blend gear oil. Both the label, and the description on their web site state for limited slip differential top-off only.

Buy Advance Auto Parts Synthetic Blend 75W-90 Gear Oil A133 at Advance Auto Parts

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