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GL-4 can be used as a hypoid gear lube, but in most cases it's probably better to use a GL-5. Long ago it was explained to me that GL-4 is a compromise in hypoid applications.

Go to this page and click on the "Where To Buy" button. It's showing in stock at Grainger outlets in my area. https://www.crcindustries.com/api-gl-4-multi-purpose-gear-oil-1-gal/ It's a small demand item, so it could be discontinued. Or possibly a batch blending wasn't scheduled soon enough...

Mike, we'd still love you even if you didn't share your character flaws.

Same here. I have a high school friend who's been using similar homemade blocks for close to 50 years. He had them on his '71 340 4 SPD Cuda, the best car in the school parking lot. He managed to slam shift it just fine.

Other than the year wait for seat covers, just the same list on which you can find the rest of us. That of the psychiatrist, to help us cope with our Mopar obsession.

Yes. There are probably several better lubes to use in MT applications, but 20W-50 or even better straight SAE 50 engine oil has been used for zillions of miles of service with zero of issues. A grade 50 motor oil has an equivalent viscosity to a SAE 90 gear lube. Probably just as important...

No one is trying to win anything, just contribute the best way we know how. You followed the golden rule, which is to go to the factory service manual. I lent my knowledge and experience from 32 years in the lubes business to update your contribution. I'm sorry if you felt otherwise. It's...

Time marches on. Products are updated as specs become obsolete. There used to be six gear lube classifications, GL1 through 6. Now only 4 & 5 are currently specified. Case in point, try finding any of those listed in your service manual. Straight 80, 90 or 140 really don't exist anymore as...

They sell a mineral base Sta-Lube 85W-90 GL-4 and a full synthetic Red Line 75W-90 GL-4. Either will work well, but if using the synthetic may need you to have the later synchronizers with the oil bleeds. I guess by selling those products, they have Brewer's endorsement.

At 100°C, claimed viscosity is 9.08 cSt, which puts it solidly in the range for an SAE 80W gear oil. At 40°C, viscosity is 41.6 cSt, equivalent to an SAE 75W gear oil. So, calling it a 75W-80W would be accurate.

I've looked over the spec sheet for the Pennzoil Synchromesh, and I think it could probably be labeled as a SAE 80 GL-4. Putting that on the label, however, might cause people to use it in an application other than it's intended use of a passenger car and light truck manual transmission fluid...

That jives with what my wife told me. She said her Grandpa told her that his job was "to break stuff."

I sure wish my wife's grandfather was still alive. He worked in the dyno room at New Process Gear all the during development and at least the first decade of production of the A-833. I'm pretty sure he could set us straight in industry standard terms. He passed away relatively young, forty...

It has merit. Both are lubes with anti-wear and anti-rust additives. Hydraulic oil is less expensive than brake fluid. Finding it in a container smaller than a gallon may not be easy, though. Hydraulic oil isn't as nasty if leaked. Brake fluid would probably be easier to find in the field, but...