Sae 140 ?? That would be fine if you plan to off road on the sun! 
Transfer case lube
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Transfer case lube
I have a 1978 F-250 with NP 205 transfer case. My manual says to use gear oil, but when I took the plug out, it looked there was tranny fluid in there. Is this going to cause problems? The truck has about 130,00 miles on it. I'm not sure how long the tranny fluid has been in there, but I've not had any problems yet. Any thoughts would be appreciated.
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In my 73 it had 90 weight gear oil. The only problem with that is when it was really cold out, you could harly shift it until you drove enough for the oil to warm up and thin out a little.
I am guessing that the tranni fluid didn't hurt it too much. The problem is that it is so thin, it won't "hang" on the gears. But with that said, because it's so thin, it gets thrown around the gear case easier and that it keeps things lubed.
I am not sure of the right answer is for the colder climets. Maybe a nice 60 weight oil?
I am guessing that the tranni fluid didn't hurt it too much. The problem is that it is so thin, it won't "hang" on the gears. But with that said, because it's so thin, it gets thrown around the gear case easier and that it keeps things lubed.
I am not sure of the right answer is for the colder climets. Maybe a nice 60 weight oil?
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From: Spokane WA
Is your t-case married to an automatic? That would make me worry about your rear seal in your tranny. Otherwise, I'd just empty the tranny fluid and fill it with an 80w-90 myself. I've heard of people using a synthetic sae50 in tranny's and t-cases, especially for cold weather. They say it just makes more noise than heavier oil. I have no problem shifting my tranny or t-case in the cold with 80w-90, so I havent tried it myself.
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As per Ford Truck Shop manual, SAE 50W engine oil if the temperature is above 10 degrees F.
Some oil company sell SAE 50w gear oil (Exxon) which contain the special gear oil additives.
Do not use multi-grade engine oil (such as 10w40, 20w50, etc...) due to the polymers in the engine oil, which will cause foaming, and which will create deposits in the transfer case.
Use straight SAE 30w or SAE 50W on your tranfer case (NP 203 and NP 205).
Some oil company sell SAE 50w gear oil (Exxon) which contain the special gear oil additives.
Do not use multi-grade engine oil (such as 10w40, 20w50, etc...) due to the polymers in the engine oil, which will cause foaming, and which will create deposits in the transfer case.
Use straight SAE 30w or SAE 50W on your tranfer case (NP 203 and NP 205).
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I have just purchased a Haynes Repair Manual in the last week. It tells me to put SAE 140W gear oil in my manual transmission and transfer case. Would you thing that would be a little thick.
My 89 ford has the mercron in the manual trans and in the transfer case.
My 89 ford has the mercron in the manual trans and in the transfer case.
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Thanks for all the replys. As far as the cold weather effecting things- I bought the truck when I lived in Montana. It does get kinda chilly up there. I live in Ga. now, but I still haven't had any problems so far.