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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

diff fluid

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Old Sep 20, 2009 | 08:52 PM
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diff fluid

so i changed my front, t-case, and rear diff fluids and the front was dark, looked like normal wear to me, same as the t-case, but the rear diff was a thick carmel color that i had never seen before, my thought was water in the diff, but from were i wondered, anybody have any ideas?
 
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Old Sep 20, 2009 | 09:42 PM
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plug may have been loose was it tight coming off
 
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Old Sep 20, 2009 | 09:46 PM
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rear diff

no plug was really tight, and theres no leaks anywere on the axle
 
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Old Sep 21, 2009 | 08:00 AM
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Well your front and rear diff take gear oil and your t-case takes ATF . So the fluids should look differnt.

Now. Some rear diffs used synthetic gear oil while "all" front diffs use standard gear oil. And if you had water in your gear oil it would be a lighter color and milky
 
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Old Sep 21, 2009 | 08:41 AM
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Originally Posted by Diesel_Brad
..."all" front diffs use standard gear oil.
The specs for mine call for using a variant for Hypoid gears.
 
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Old Sep 21, 2009 | 09:42 AM
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according to the haynes manual it takes 90w in the front and rear and atf dextron/mercron in the t-cse
 
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