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Unread 12-07-2012, 10:22 PM   #1
Trendsetter75
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Gear Oil Question

For colder weather such as 18-30 degrees Fahrenheit should I use 75w 140 or 85w 140 gear oil, and how often should I change the gear oil. I don't go in water or mud.

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Unread 12-08-2012, 06:31 AM   #2
2jhanna
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Any quality 80/90 or 75/140 GL5 will be fine. Valvoline, Castrol, Pennzoil, etc. Every 30k miles. Just make sure the label states that is good for LSD or you will need additive in the rear axle.

Axles:

Dana 30 - 1.25 quarts 80W-90
Dana 35 - 1.75 quarts 80W-90 or 75W-140 *
Dana 44 - 2 quarts 80W-90 or 75W-140 *
Rubicon Dana 44 (FRONT) - 1.375 quarts 75W-140 synthetic
Rubicon Dana 44 (REAR) - 2 quarts 75W-140 synthetic **

*4 oz of friction modifier is required with Trac-Lok limited slip differential.
**Friction modifier is NOT required with Tru-Lok locker/limited slip differential (factory Rubicon locker).
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Unread 12-08-2012, 07:58 AM   #3
Trendsetter75
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Quote:
Originally Posted by 2jhanna View Post
Any quality 80/90 or 75/140 GL5 will be fine. Valvoline, Castrol, Pennzoil, etc. Every 30k miles. Just make sure the label states that is good for LSD or you will need additive in the rear axle.

Axles:

Dana 30 - 1.25 quarts 80W-90
Dana 35 - 1.75 quarts 80W-90 or 75W-140 *
Dana 44 - 2 quarts 80W-90 or 75W-140 *
Rubicon Dana 44 (FRONT) - 1.375 quarts 75W-140 synthetic
Rubicon Dana 44 (REAR) - 2 quarts 75W-140 synthetic **

*4 oz of friction modifier is required with Trac-Lok limited slip differential.
**Friction modifier is NOT required with Tru-Lok locker/limited slip differential (factory Rubicon locker).
I have factory LSD in my rear D44 Axle.
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Unread 12-08-2012, 08:04 AM   #4
2jhanna
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Quote:
Originally Posted by Trendsetter75 View Post
I have factory LSD in my rear D44 Axle.
I saw that from your profile. Most quality GL5s already contain the LSD additive in the proper ratio for factory LSD units.

Look for wording on the label similar to:

"Suitable for make-up and refill of conventional and limited slip differentials...."

Refill being the key word

This is from Valvoline.

Valvoline High Performance Gear Oils are superior sulfur-phosphorus, extreme pressure gear lubricants formulated with premium quality base stocks to meet the demands for excellent performance. It is designed to provide excellent load carrying capacity, extreme pressure properties, anti-foam performance, demulsibility, corrosion protection, thermal stability protection, and service fill limited slip capability. These products are recommended for conventional rear axles, limited slip rear axles, and transmissions requiring EP gear lubes under high speed, high load, high torque, and high horsepower conditions. Valvoline High Performance Gear Oils meet or exceed API Services GL-5 and GL-4*. The inclusion of Limited Slip Friction Modifier in this product makes it unnecessary to add additional friction modifier (Ford M2C118A, Chrysler MS-5630, or GM1052358) in most vehicles
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Unread 12-08-2012, 11:04 AM   #5
Trendsetter75
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What Weight should I go with cold weather 75w or 80w. Im using Valvoline as well. I see they have the gray bottle and the white bottle, I guess the gray bottle is synthetic.
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Unread 12-08-2012, 11:18 AM   #6
Jerry Bransford
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In reality, there isn't a whole lot of difference in viscosity between 75W or 80W and the exact viscosity we use in our axles is not critical. In theory however, the 75W rating would be a little better in the coldest conditions than 80W would but not by a significant margin. A 75W-90 or 80W-90 would be fine for extremely cold conditions.
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