Rear end gear oil

joe71 · Post by **joe71** » Sat Jan 28, 2006 1:25 am

After pulling the axle on my 71 D200 I lost some of the gear oil. Can anyone recommend a type of gear oil i should use? and should i use an additive no one really seems to know.

docproc · Post by **docproc** » Sat Jan 28, 2006 5:38 am

Joe, welcome to the site. I ended up driving my 70 D200 from Washington state to Florida and was doing some freshening up before my trip and one of the things I did was change the rear end grease. I went with mobil 1 rear end lube. It was fully synthetic and cost a little more than the regular stuff. Within 1500 miles of freeway driving the rear started to loosen up a bit as I was noticing my engine speed starting to decrease at a given speed. With a 4.10 I used to be turning at 2950 at 60 mph, now the motor turns at 2800 at 60 mph. I did not use any additives. Just my 2 cents......Dr. P

MountainMoparRobin · Post by **MountainMoparRobin** » Sat Jan 28, 2006 6:38 am

I know the oil is a 90 weight, I think 80w90 someone will correct me

I don't have my bottle with me or I'd go in the garage and look.

joe71 · Post by **joe71** » Sat Jan 28, 2006 10:24 am

Thank's Dr.P/Robin. When changing the oil did you use a replacement gasket or just some type of sealant?

docproc · Post by **docproc** » Sat Jan 28, 2006 6:29 pm

I have the dana 60 and I used silicon sealant......Dr.P.

heviarti · Post by **heviarti** » Sat Jan 28, 2006 8:45 pm

80 or 90 should be good. sometimes a multi viscosity oil will cause howl.

as to additives I recommend slick 50 manual transmission treatment.

Post by **cowboy** » Sat Jan 28, 2006 10:12 pm

heviarti, does the slick(sick) 50 have the teflon like there oil junk , if so dont use as it will start glogging up , Thats why they slow down on all there tv adds about start-up's & most dealers wont cover a warrenty if it's found in the engine

bean · Post by **bean** » Sat Jan 28, 2006 10:37 pm

Just put the rear end in the 65 today... i know i used 90 weight...but im not sure what brand.

heviarti · Post by **heviarti** » Sat Jan 28, 2006 11:32 pm

I'm not sure what all is in the tranny shmeeze, but I can vouch for it's results on any bearing. we had a heater at the shop with a squeaky fan. someone oiled it, and it was squalling within two days. a drop of slick 50 manual trans, it hasn't made so much as a chirp since. did as good a job on tranny, diff, winch, transfer case... it's good stuff.

MountainMoparRobin · Post by **MountainMoparRobin** » Mon Jan 30, 2006 6:13 pm

I use gasket and permatex don't want any leaks

Highcountry · Post by **Highcountry** » Mon Jan 30, 2006 8:21 pm

...75W90, 75W85, 85W140??? The viscosity really doesn't make much difference! What is REALLY important is make SURE the lube you use is rated GL-5 and nothing else. A differential is a "hypoid" arangement, which means the gears "slide" against one another which requires GL-5 lube. I personally prefer ROYAL PURPLE lubes, highest tech available in my opinion.

Thanks, Bruce

Sweptline.ORG

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