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Junior User
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Newb question
Ok guys this may sound dumb but it should be a easy couple answers. I'm going through all fluids,
76 F100. 360 w/ 4speed and dana 21 transfer case
Question #1.
Are there drain plugs on the front and rear differentials? I see the fill plugs but not drain plugs.
Question #2
For the transmission and transfer case is 140W really needed or is 90W ok? 90W seems to be what I'm seeing around here
Thanks for the help
76 F100. 360 w/ 4speed and dana 21 transfer case
Question #1.
Are there drain plugs on the front and rear differentials? I see the fill plugs but not drain plugs.
Question #2
For the transmission and transfer case is 140W really needed or is 90W ok? 90W seems to be what I'm seeing around here
Thanks for the help
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
If you want to visually inspect the gears yes, otherwise i just use a little hand held suction pump to drain the diffs.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
I like Mobil One 75-140 or 75-90weight is even better. This oil makes the 4 speed shift better especially when cold.
FYI do not over fill the trans oil. This causes the main shaft to stop turning to soon between shifts and is hard on syncronizers. I fill mine to just below the fill hole. If you fill it full, let it drain back out all it can before you put the fill plug in.
FYI do not over fill the trans oil. This causes the main shaft to stop turning to soon between shifts and is hard on syncronizers. I fill mine to just below the fill hole. If you fill it full, let it drain back out all it can before you put the fill plug in.
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Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
The owners manual for a '76 actually calls for sae 50w in the manual trans and the t-case but I couldnt find any on the day I was servicing mine so I used the 75-90w. One of these days I'll locate or order some straight 50w and use that
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Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
Motor oil and gear oil have different characteristics, i wouldn't put motor oil in my differentials so why put it in my transmission and transfer case which both contain gears.
Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
Bama's correct, the factory service manuals do call for 50w motor oil but i (and everyone i know) have always used 90w gear oil, both are the very same viscosity.
Motor oil and gear oil have different characteristics, i wouldn't put motor oil in my differentials so why put it in my transmission and transfer case which both contain gears.
Motor oil and gear oil have different characteristics, i wouldn't put motor oil in my differentials so why put it in my transmission and transfer case which both contain gears.
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
I know, i know, but i gotta part company with big brother on this one. 
Gear oils have a much higher level of extreme pressure additives than motor oils do, also there are a lot of additives in motor oil that will serve no purpose in a gear application.
Personally, i'll continue to use gear oil in my tranny and t-case, there are enough differences in the engine vs. tranny/t-case environment that I feel better going that route.
Lastly, as i noted earlier, 50w motor oil and 90w gear oil both share the same viscosity rating so the flow characteristics are the same between the two.
Gear oils have a much higher level of extreme pressure additives than motor oils do, also there are a lot of additives in motor oil that will serve no purpose in a gear application.
Personally, i'll continue to use gear oil in my tranny and t-case, there are enough differences in the engine vs. tranny/t-case environment that I feel better going that route.
Lastly, as i noted earlier, 50w motor oil and 90w gear oil both share the same viscosity rating so the flow characteristics are the same between the two.
Posting Guru
Joined: Dec 2009
Posts: 2,134
Likes: 1
From: Mississippi
I know, i know, but i gotta part company with big brother on this one.
Gear oils have a much higher level of extreme pressure additives than motor oils do, also there are a lot of additives in motor oil that will serve no purpose in a gear application.
Personally, i'll continue to use gear oil in my tranny and t-case, there are enough differences in the engine vs. tranny/t-case environment that I feel better going that route.
Lastly, as i noted earlier, 50w motor oil and 90w gear oil share the same viscosity rating so the flow characteristics are the same between the two.
Gear oils have a much higher level of extreme pressure additives than motor oils do, also there are a lot of additives in motor oil that will serve no purpose in a gear application.
Personally, i'll continue to use gear oil in my tranny and t-case, there are enough differences in the engine vs. tranny/t-case environment that I feel better going that route.
Lastly, as i noted earlier, 50w motor oil and 90w gear oil share the same viscosity rating so the flow characteristics are the same between the two.
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
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