t-case lube

TDubya

Sr. Member

Joined

Aug 3, 2009

Messages

381

Loc.

Fortuna, CA

• Aug 14, 2012

• #1

I know 40 years ago 50w was recommended for the Dana 20 and that is what I've always used. Is that still the best stuff to use, or should I be using gear lube?

 

NicksTrix

Bronco Guru

Joined

Aug 1, 2001

Messages

6,386

• Aug 14, 2012

• #2

90W is quite commonly used and readily available

 

75brnco

Full Member

Joined

Apr 11, 2010

Messages

208

• Aug 14, 2012

• #3

http://www.novak-adapt.com/knowledge/dana_20_rebuild_guide.htm

 

Bronco Junkie

So Cal Broncos

Joined

Feb 29, 2012

Messages

3,233

• Aug 14, 2012

• #4

90W in mine.

 

Justafordguy

Contributor

Bronco Guru

Joined

Sep 26, 2009

Messages

6,253

• Aug 14, 2012

• #5

I have always run 90W in mine.

 

Skiddy

Bronco Guru

Joined

Oct 8, 2003

Messages

11,557

• Aug 14, 2012

• #6

Justafordguy said:

I have always run 90W in mine.

Click to expand...

same here and can use it in the diffs as well

 

Broncobowsher

Total hack

Joined

Jun 4, 2002

Messages

34,882

• Aug 14, 2012

• #7

90W (actually synthetic 75W90) for many years as well.

I have a generic service manual from the mid 60's, oil recomendations were a lot different back then. Recomended oil for engines being a straight 20 weight from the factory. Recomendations of old were good when that was the limit of technology, times have changed and so has the oil.

 

BroncoBrummet

Sr. Member

Joined

Nov 6, 2007

Messages

395

Loc.

Spring Creek , NV

• Aug 14, 2012

• #8

Sorry to hi-jack, what oil for np435 is everyone using?

 

blubuckaroo

Grease Monkey

Joined

Jun 11, 2007

Messages

11,795

Loc.

Ridgefield WA

• Aug 14, 2012

• #9

So lets see the paychecks for you oil engineers. I'll go with the pros. SAE 50 for 170K miles.

 

addicted

Bronco Guru

Joined

Jun 7, 2009

Messages

1,936

Loc.

Broussard, Louisiana

• Aug 15, 2012

• #10

Well the PO seemed to think that mud and water was a good lube but Ive since swapped over to 75-90. I dont think the lubrication of a D20 requires an oil engineering degree. Its not exactly a close tolerance, highly sophisticated, piece of NASA engineered equipment. lol.

 

B

broncnaz

Bronco Guru

Joined

May 22, 2003

Messages

24,341

• Aug 15, 2012

• #11

Been running 50W for 325K+ and the t case still works fine never been rebuilt. put a new outputshaft seals in but thats about it.

As for the NP435 well it can take either as well. Some early specs called for 50W other specs called for 90W. I run 50W in mine and I dont know how many miles it had on it before I got it but its a 1968 tranny thats appears to have never need rebuilt either. I installed it in 86 and have put well over 150K on it. I do put a little moly lube additive in mine as well.