Rear differential service oil ? - Hemi Truck Club
 
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Old 03-15-2018, 05:19 AM   #1
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Rear differential service oil ?

I don’t have a manual. my 03 with 3.92 gears what weight gear oil do i use and do i need lsd additive? How much oil is needed ?

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Old 03-15-2018, 08:27 AM   #2
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This is from my 05 owners manual. (should be the same for your 03) IIRC I used a little over 2 1/2 qts. +_additive, but I also changed to a aftermarket cover. Just fill till it runs out the cover. MoparSynthetic Gear Lubricant SAE 75W-140 (MS-8985). Limited-Slip
Rear Axles on 1500 Models Require the addition of 118 ml (4 oz.) Mopar
limited slip additive or equivalent
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Old 03-15-2018, 09:23 AM   #3
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Quote:
Originally Posted by TooCool View Post
This is from my 05 owners manual. (should be the same for your 03) IIRC I used a little over 2 1/2 qts. +_additive, but I also changed to a aftermarket cover. Just fill till it runs out the cover. MoparSynthetic Gear Lubricant SAE 75W-140 (MS-8985). Limited-Slip
Rear Axles on 1500 Models Require the addition of 118 ml (4 oz.) Mopar
limited slip additive or equivalent
You only need the LSD additive if you have a factory LSD. I think with the 3.92 gears, you most likely do.

As TooCool posted, just fill until the gear oil starts to run out of the fill hole on the factory cover. If you have an aftermarket cover, like a Mag-Hytec or something similar, it should be the same process, depending on where the fill hole is. I think the Mag-Hytec actually has a dipstick for the level but the fill hole is still about the same(ish) level as stock and the described method should work fine.

I really need to change the gear oil on my truck...
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Old 03-15-2018, 01:46 PM   #4
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Thanks guys, had to order a timken wheel hub from rockauto so i just got the gear oil there also. Went with the lucas full synthetic 75w-140
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Old 03-15-2018, 08:22 PM   #5
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Quote:
Originally Posted by Stanger View Post
Thanks guys, had to order a timken wheel hub from rockauto so i just got the gear oil there also. Went with the lucas full synthetic 75w-140
I too run the Lucas Synthetic 75W140 gear oil in my open diff. with 3.92 gears. I will be using the same thing when I switch to a Detroit Locker, and 4.56 gears.
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Old 03-16-2018, 04:28 AM   #6
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All of what was said above except there was a TSB for filling the diffdont fill until it runs out fill to 3/8” below the hole or first pinky finger knuckle deep.
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Old 03-16-2018, 03:25 PM   #7
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This is the service when needed on the 2007 year models taken from my owners manual.

This inspection should be made with the vehicle in a level
position. The fluid level should be even with the bottom
of the fill hole for the Manufacturer’s C205F HD Front
Axles. The fluid level should be 5/8” (16 mm) below on
9 1/4” Manufacturer’s Rear Axles.

For all 2500/3500 Model axles, the fluid level should be
1/4” ± 1/4” (6.4 mm ± 6.4 mm) below the fill hole on the
9.25” Front and 3/4”± 1/4” (19 mm ± 6.4 mm) on 10.5”
Rear axles. The 11.5” Rear Axle level should be 1/4” ±
1/4” (6.4 mm ± 6.4 mm) below the fill hole.
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Old 03-16-2018, 09:25 PM   #8
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Using Lucas 85W140 heavy duty conventional differential oil in my Detroit Tru-Trac with the Motive 4:56 gears and PML extra capacity cover. No problems noted at all in over three years with this lubricant. The high quality pure synthetic differential oil has been reported to work very well too .

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