Is GL-1 rated gear lubricant suitable for 3 speed tranny?

[TJM70's_48]

I now know my transmission has the wrong oil in it - hypoid GL-5. I picked up a gallon of Ford tractor gear oil today - pure mineral 90wt GL-1 rating. Suitable for ford farm transmissions between 1939 and 1952.

Is this what I want to use or should I keep looking?

If I want to change it out, should I do any kind of flush to remove the old (wrong) oil that's in there?

Tom

[Plymouthy Adams]

you do a drain and let it drip dry real good..you should not really need a flush...but if you did want to flush..you can get SeFoambrand tranny flush at the bix box store..follow their instructions and then when flush is complete, fill with the new GL1

[TJM70's_48]

Thanks for the help, Tim.

[TJM70's_48]

Does anyone else use GL-1 rated oil in their tranny?

[DJ194950]

according to borg warner overdrive repair manuel,

correct oil for the std. 3 speed box and overdrive unit is gl-1.

so i'd assume if its ok in trans with overdrive it should be fine in trans without od as the main box and gears are the same and share oil.

its what i'm using in my od trans.

good news?

doug

49 suburban

50 4 dr. super deluxe

[Powerhouse]

I read this on wikipedia...http://en.wikipedia.org/wiki/Gear_oil

It is extremely important to note that EP additives are corrosive to yellow metals such as copper or brass in bushings or synchronizers. GL1 is the class of gear oils that does not* contain EP additives, so it is the correct gear oil for. Having the same viscosity as 50W motor oil, some owners/operators have switched to this more readily available choice.

Has anyone just used 50W motor oil????

[Powerhouse]

Anyone know what it means when the label reads:

EXCEEDS ALL GL CLASSIFICATIONS.

Lucas Oil/1 qt. 80W-90 high performance heavy duty gear oil label says so.

Is it safe to use in an OD tranny?

That's what I have in there now...as well as rear.

[greg g]

if it's compatable with hypoid gears, it not good for brass parts which is what our synchro's are made of. Probably the balking rings in the OD also.

The Lubriplate makes a non hypoid gear oil but only in 5 gallon pails. Tractor places are good sources for GL1. Some of the new additives superceed Gl 1 but do not replace it.

Sometimes more is not better.

Although some of the synthetics say they are good for everything.

[DJ194950]

gl-1 oil is available from napa #65-201

was not in store here but had it next day. about $18.00 per gallon.

took about half for 3 sp. w/od.

happy hunting

doug

[1941Rick]

I have found that when in doubt call the oil company...ie ESSO....they have a tech department that can give you the straight goods......

You must use an oil that is compatible with brass parts...

[TJM70's_48]

I bought my gallon of GL-1 at Tractor Supply - it was in stock on the shelf. $20 including tax. It took me a while to find it, but, I'm relieved to have the right stuff.

My car is in what is probably not an uncommon situation: much of the work done by the previous owner was undocumented and not up to snuff (he didn't have a shop manual...I do). I'm left with trying to take things one step at a time.

A compounding factor for me is that this is my first antique car and I'm learning a lot as I go. Some things I knew - like brakes and how to time an engine...well, there are quirks to the Lockheed system and turns out everthing I ever was told about disconnecting the vacuum advance when timing was wrong in 1948. So, I scrape along trying to get it right.

Thank God for this forum.

[greg g]

Are you in George Asche country??? He lives in Venus PA near Oil City.

[TJM70's_48]

I'm a few hours away from Oil City...I'm east of Pittsburgh. Closer to the supplier of rubber parts in Windber, PA. Can't remember the name, just made a mental note that someone pretty local has stuff for my car. I live about 20 miles (west of) from where United Flight 93 was crashed on September 11.

I'm not familiar with George Asche...is he a parts dealer? Seems to me I've see the name here on the forum. I was just in the Oil City area about 2 weeks ago for work.

[greg g]

George is an older fellow with a great deal of knowledge of Mopar flatheads, he rebuilds carbs, his sons do auto electric stuff, he splits intake and exhaust manifolds and sels and or rebuilds OD transmissions. He is listed in the vendor section on the main page of this site. He doesn;t do computer stuff so its phone only, and he like to talk....