Transmission Oil
 

Not to open another proverbial can of worms, but is this stuff a good lubricant for our old gearboxes? It's straight 90-weight, GL-1 rated and cheap at just 18 bucks for TWO GALLONS. It's from Tractor Supply.

http://www.tractorsupply.com/en/stor...on-fluid-2-gal

Re: Transmission Oil
 

Depends. Is your vehicle a 9N tractor?

Re: Transmission Oil
 

If you've got brass-anything, get the Brad Penn gear oil available through Summit.

Re: Transmission Oil
 

GL1 has very little high pressure additive if any. It should work OK with light duty use. If it works in a tracor then it will work in a car. You can use GL4 lubricant as well since it is still considered to be mild EP as the old long ago superseded GL3 was and it won't hurt the yellow metals. Sta-lube from Napa or other parts suppliers has a GL4 rated lubricant but it may be a bit more expensive than the tractor supply stuff. The rear axle really should have some EP additive in it.

Re: Transmission Oil
 

I've been running Lucas 85W-140 gear oil in both the transmission and rear end (see link below). Upon further research I found that GL-5 was bad for brass and other soft metals. I want to swap the Lucas out of the transmission and replace it with something safer.

LINK: http://lucasoil.com/products/gear-oi...w-140-gear-oil

Re: Transmission Oil
 

I understand GL4 but use either 85W-140 or 95W-140 in Steering box, Tranny, Overdrive and Differential.

Re: Transmission Oil
 

I uses GL-1 in my Ford 8N, not sure about your car. My Firebird 5-speed used ATF in the trans, my mechanic said it was for gas mileage compliance by GM.

Re: Transmission Oil
 

Guys, I ended up getting some Sta-Lube GL-4 stuff from Napa. It was still a fair price at about $35 for a gallon.

Re: Transmission Oil
 

When you buy bulk lube (gallons or larger), how do you guys get it from the package/container and into your differential? I saw a small (under 4 gallons) tank at a garage sale this week that looked like it had a hand pump on top of it for pumping liquid or grease out of the tank through a rubber hose. Maybe I should have snapped that up, huh?

Re: Transmission Oil
 

With great difficulty, LOL! I've got a laboratory-style squeeze bottle that I've augmented with a larger diameter hose so it flows *slightly* better. Still it's not an easy task filling the rear-end or transmission, though putting a squeeze-type bar clamp on the plastic bottle does help a lot.

Re: Transmission Oil
 

Your Firebird probably had a Borg-Warner T5 which used ATF for the carbon-fiber synchros, not necessarily for fuel economy.

Re: Transmission Oil
 

I use a suction gun (looks like a grease gun but just has one handle on one end and a hose nipple on the other) that has a tygon tube that is long enough & small enough in diameter to insert in most gearboxes & axles. I have to pull it appart and clean it if I change to a different lube but it makes the work easier anyway.

Re: Transmission Oil
 

There is a pump that screws onto the bottle of lube. NAPA has it. Should be right
by where that bottle of gear oil you purchased.

Re: Transmission Oil
 

A suction gun is an inexpensive tool for filling transmissions. We put a long tube on the outlet. Suck up oil from the container, insert the tube in the transmission and expel enough oil to just fill to the bottom of the filler hole. These guns are available at most good parts stores.