GEAR OIL

[jimk]

I installed Mobile 1 gear oil shc 629 which is 150 vg in the differentials in my 95 4x4 and it had a lot of air bubbles traped in the gear oil when I checked the levels. Not bad in the rear with the anti-slip. But the front looked like whip cream and I drained
them out and replaced it with regular 90 wt. Any ideas, no water was in them either. also does this forum have a spell check in the tools?

 

[LandShark]

JimK: I have no idea what 'Mobile 1 gear oil shc 629 which is 150 vg' is, or what 'regular 90 wt. ' is. It would also help if you mentioned what axles are in your truck.

Start out by using the proper multigrade gear oil. For a 1995 truck use API/GL-5 SAE 80w90. Do not over fill; this can cause air to be whipped into the oil!

Front axle:
For a Dana 44 full is 1/4 inch below the bottom of the fill hole. For a Dana 60; full is 1/2 inch below the bottom of the fill hole.

Rear Axle:
For a 9 1/4 inch axle, full is . 625 inch below bottom of fill hole. For Dana 60, 70, or 80, full is 3/4 inch below bottom of fill hole.

The above information is from a 1995 Chrysler Ram Truck Service manual.

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1995 2500 SLT Club 4x4, auto, 3. 54, 3300 pound Elkhorn slide in camper, AirLift air springs, Ricka dual wheel adapters (used only with the camper on), K&N, DC tow hooks, Rancho RS9000, Hellwig rear sway bar.
110,000 miles and counting.

[This message has been edited by LandShark (edited 03-20-2001). ]

 

[Dan Watson]

JimK,

You are using a Mobile industrial gear oil in the wrong place. This particular oil is not rated GL-5 which is required for your differentials. The ISO 150 rating is equivalent to a straight 90 weight under the SAE ratings. It is unwise to use gear oils for industrial use in your truck. The additives for the GL-5 gear oils are designed for the sliding contact of the ring and pinion gears in the differentials. Use of non-Extreme Pressure (EP) gear oils will result in premature failure of the gears.

Stick with the recommendations in your owners manual. I believe in synthetic gear oils for all gear applications. Large equipment mfg's recommend synthetic gear oils and usually triple the warranty when the synthetics are used. Companies like UPS use nothing but synthetic gear oils. If you tow a lot and are near GCVW limits I recommend you use a synthetic 75W-140. This gives you better shock absorption on gear shifting which cause a hammering effect in the rearend.

Dan Watson
AdvancedLubeTech

 

[Missouri Mule]

Jim,
No spell check on forums. I use the write icon(print out word unsure of) then use spell check, or you can use write icon for whole Post/Reply, copy(from write after spell check) then paste in box for post/reply.

Like LandShark I had no idea what the number meant for the gear luge you were using.
Glad Dan did and he is right use only recommended gear lube specs.

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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000