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**99ram360** · 12-01-2011, 09:05 PM

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hey im new to the forum and new to dodges, i just picked up a 99 dodge half ton extended cab long bed its all running and has a sticker just needs tinkering. but i noticed the differential cover was leaking i just wanted to know what im suppose to use for fluid and if theres any additives. thanks

**txbass06** · 12-01-2011, 09:16 PM

This is what I used

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**99ram360** · 12-01-2011, 09:18 PM

haha beautiful that works perfect. thanks

**txbass06** · 12-01-2011, 09:56 PM

No problem bud. Just make sure you get the diff additive when you do it. Not sure if you can tell from the pic but that's the two small white bottles

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**Mopar1973Man** · 12-01-2011, 11:24 PM

Hmmm... I've just bought a 5 gallon bucket of Mobil One 80w-90 Gear lube.

I buy in bulk for much less...

5 Gallons - 10w-30
5 Gallons - 15w-40
5 Gallons - ATF
5 Gallons - 80w-90

Total $320.00

**99ram360** · 12-02-2011, 12:32 AM

is there a special attitive i should use? and i wish i could buy in bulk like that it would be so much cheaper

**Mopar1973Man** · 12-02-2011, 09:54 AM

Originally Posted by 99ram360

is there a special attitive i should use? and i wish i could buy in bulk like that it would be so much cheaper

If you got a limited Slip rear end then you need the friction modifier to add to the gear lube or just buy gear lube with the friction modifier. When you have the diff cover off you know what you got...

**99ram360** · 12-03-2011, 11:32 AM

ya i assume it probably has a limited slip but i havent checked ill do it this week

**V-10 RAM** · 12-03-2011, 08:27 PM

Originally Posted by Mopar1973Man

If you got a limited Slip rear end then you need the friction modifier to add to the gear lube or just buy gear lube with the friction modifier. When you have the diff cover off you know what you got...

I believe ALL MOPARS with limited slip diffs need a Modifier added. Even the synthetic gear oils that are suppose to meet limited slip specs.
I say this because somewhere in one of my MOPAR vehicles owners manuals it says to add a modifier PERIOD. I don't remember the exact wording but that was the point.
Most of the newer Mopars call for synthetic gear oil. But I run dino in my Jeep GC 5.9 limited with out any trouble.
Under your hood towards the grill should be a list of equipment ie: which diff, gear ratios, paint code, etc.
You should buy an owners manual they are cheap like $14 on ebay. There is a world of info in those manuals. In fact maybe 50% of the questions asked on these forums are in the owners manuals.

**Mopar1973Man** · 12-04-2011, 09:34 AM

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You should buy an owners manual they are cheap like $14 on ebay.

How about FREE and a full Factory Service Manual???
Download PDF Dodge Ram 2001 Service Manual | PDFTown.com

I'm using Mobile One 80w-90 GL-5 lubricants for the last 190K miles with zero issues... Change fluids every 30K.

DESCRIPTION
A multi-purpose, hypoid gear lubricant which conforms to the following specifications should be used. Mopar Hypoid Gear Lubricant conforms to all of
these specifications. SAE ratings also apply to multiple grade gear lubricants. In addition, API classification defines the lubricants usage.

FRONT AXLE
² The lubricant should have MIL-L-2105C and API GL 5 quality specifications.
² Lubricant is SAE 75W-140 SYNTHETIC gear lubricant.

REAR AXLE
² The lubricant should have MIL-L-2105C and API GL 5 quality specifications.
² Lubricant is a thermally stable SAE 80W-90 gear lubricant.
² Lubricant for axles intended for heavy-duty or trailer tow use is SAE 75W-140 SYNTHETIC gear lubricant.

NOTE: Trac-lokY and Vari-lokY equipped axles require a friction modifier be added to the lubricant.

CAUTION: If axle is submerged in water, lubricant must be replaced immediately to avoid possible premature axle failure.

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noob to dodge differential fluid ?