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what fluid in dana 20
- Thread starter 4lofun
- Start date
- Joined
- Aug 23, 2007
- Messages
- 24,346
Original spec was 30w motor oil. 80w gear oil is fine in the cold.
broncodriver99
Bronco Guru
Last edited:
broncodriver99
Bronco Guru
Just playin. Figured he hit the wrong #. He is usually the guy who knows the answers to the tough questions.
I added a smiley to my previous post. Better?
Just playin. Figured he hit the wrong #. He is usually the guy who knows the answers to the tough questions.
I added a smiley to my previous post. Better?
Viper is good, really good, I call this test. As for me I would put some ep 90 and keep wheeling.
Where is Dirt?
- Joined
- Nov 3, 2003
- Messages
- 49,427
Right here. Ran 50 weight Valvoline Racing oil (remember, it has to be a non-detergent motor oil specifically) for years and had very good luck.
I changed to a full synthetic 75w/90 gear oil and ran it for years too.
I like gear oil for it's extra "cushion", the 75w/90 because it's a relatively lightweight and easy-flowing, and synthetic because it flows SUPER easy when pumping it in, offers good protection year-round in any temperature I'm likely to see, and leads me to believe it'll fling itself all over the case when things are spinning to help lube the output bearings. And it was available without the GL-2, 3 and 4 additives that were originally detrimental to the soft materials that the bushings and thrust washers were made out of.
And because I like synthetics in applications where you're not changing the oil very often. Like gear boxes. Nowadays you can easily find standard grade gear oils that won't attack the bronze bushings, but I'm sticking with the synthetics.
T-shift case still shifts like butter no matter what the circumstances. No noises or other ill effects.
Paul
I changed to a full synthetic 75w/90 gear oil and ran it for years too.
I like gear oil for it's extra "cushion", the 75w/90 because it's a relatively lightweight and easy-flowing, and synthetic because it flows SUPER easy when pumping it in, offers good protection year-round in any temperature I'm likely to see, and leads me to believe it'll fling itself all over the case when things are spinning to help lube the output bearings. And it was available without the GL-2, 3 and 4 additives that were originally detrimental to the soft materials that the bushings and thrust washers were made out of.
And because I like synthetics in applications where you're not changing the oil very often. Like gear boxes. Nowadays you can easily find standard grade gear oils that won't attack the bronze bushings, but I'm sticking with the synthetics.
T-shift case still shifts like butter no matter what the circumstances. No noises or other ill effects.
Paul
VT_Don
Full Member
- Joined
- Aug 16, 2001
- Messages
- 365
Believe owner's manual specifies, 50 weight engine oil. Has been a tad bit of improvements in gear box oils since 1966. Suggested reading is, ANSI/AGMA 9005-E02
As the Dana 20 has neither bronze synco rings, or friction surfaces, oils with extreme pressure additives will prove beneficial.
As the Dana 20 has neither bronze synco rings, or friction surfaces, oils with extreme pressure additives will prove beneficial.
- Joined
- Aug 23, 2007
- Messages
- 24,346
Yes, I miss-typed. But I was still correct. SAE 30 is specified below 10 degrees F. SAE 50 above that.
- Joined
- Nov 3, 2003
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Correct. But it specifically calls for a "non-detergent" motor oil.
That's a fact-and-a-half!
Not 100% correct. The thrust-washer(s) that set the freeplay in one of the shafts (intermediate I think?) are all bronze. Premature wear there would possibly cause popping out of gear issues and the like.
Or maybe cause nothing of the sort, but they were perhaps just being overly cautious because they could and it didn't cause anybody any real headaches trying to find non-detergent oils back then.
And I thought there was a bronze cylinder-type bushing in one of the bores too, but that may be the 3-speed manual trans' idler shaft I'm thinking of?
Paul
- Joined
- Aug 23, 2007
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If you have an auto trans you could be leaking trans fluid into the tcase.
70_Steve
Old Guy
- Joined
- Dec 13, 2002
- Messages
- 8,317
You know what they say... "If it looks like ATF, and it smells like ATF..."
Might be worth pulling the fill plug and checking to see if you magically picked up some lube!!!
kayakersteve
Full Member
What is D20 capacity??
70_Steve
Old Guy
- Joined
- Dec 13, 2002
- Messages
- 8,317
2.75 pints or about a quart and a half.
Jr.mudflinger
Jr. Member
80W90 is what I use. Does fine. Anything over 90 usually works well.
blubuckaroo
Grease Monkey
My book says SAE 30 or 50 depending on the temperature. It says nothing about non-detergent. I've been using SAE 50 Valvoline Racing oil since the first change. Must be ok. I have over 270K miles with nothing replaced but an adapter seal. Why try to second guess an oil engineer? Most of them make far more than I can imagine.%)
