Napa 90W gear oil

[steelsoldiers]

Hey,
Have any of y'all used the Napa 90W GL1 gear oil in your diffs or t-case? I found a good price on some in the 5 gallon pail at my local store. It might be a little thick for a tranny in winter, but I would think it would be OK for diffs or t-case. Since I need 11 gallons of the stuff, I figure it would be a good way to go. Thoughts? Experiences? Thanks.
Chris

 

[Recovry4x4]

I use the Warren brand of GL-1 and have no problems with it at all. NAPA stuff should be par with the Warren stuff.

 

[jwaller]

I used the napa GL1 when I first got my truck bc I was wary of synthetics and napa was the only place I could find GL1. I have since switched to pure Mobil 1 in all axles cases and the trans. I had no problems with the napa stuff but I preferred to switch to the modern fluids for mpg's as I drive mine quite a lot.

 

[steelsoldiers]

Great, thanks guys. I'll grab a couple of pails and try it out.

 

[red devils dude]

read this it has all the info on gear oil you will ever need
http://www.steelsoldiers.com/index.php?name=PNphpBB2&file=viewtopic&t=8941&highlight=gear+oil

 

[steelsoldiers]

Thanks Jed, I had seen that post before, very helpful.

API GL-1 : Non-additive lubricant oil for mid level service conditions spiral-bevel, spiral, chronic endless gear type differential and some plate gearboxes.

It would seem that my differentials and t-case could fall under this definition since they won't see heavy-duty conditions (ie-fully loaded, towing, loaded/towing off-road). Am I reading that right?

 

[red devils dude]

the thing is when most of these truck came off the assembly line they got MIL-L-2105 which
is a GL-4 see(MIL-L-2105 : Former specification equal to API GL-4 performance level).

 

[acetomatoco]

What is "most of these trucks" ? GL1 is the oil of choice for gear boxes on "most of my trucks" ACE btw.. it is a lot cheaper at the farm tractor stores than at NAPA most of the time...

 

[red devils dude]

all M series 1960's to present see the chart in my link.

 

[steelsoldiers]

My question wasn't really "What did they come with?" it was more "Will GL1 90W work safely as an alternative?" I'm sure I could prolly order pails of 80W90 GL4, but if GL1 will work and it's on the shelf, then I'll use it. I appreciate the technical data Jed.

 

[steelsoldiers]

Holy crap that's cheap. You should sell that out of the back of your truck at Aberdeen

 

[m38inmaine]

I ordered napa brand GL-4 from my local store and it was around $45 per 5gal pail.

 

[Ferroequinologist]

Ouch! I'm going to dig an oil well....

 

[red devils dude]

I spent $60 for 5gals of CASTROL AP Gear Lubricant it's what the military use's appearantly.

 

[Rattlehead]

When I first changed out all the fluids in the deuce, I put in some 90w GL-1 in the trans and the t-case, GL-5 in the axles since it offers EP additives and there's no synchros to worry about. Afterward, the trans was VERY hard to shift if I had been on the highway for an hour or two. Ended up putting in some MT-1 gear lube and that solved the hard shifting.