80W90 GL5 oil for Ford 2000 tractor trans?

Folks sorry for broken record question but not found answer yet. Have a 1964 Ford 2000 gas tractor w/4 spd trans. It's basically a Ford 601 tractor with different color scheme and hood. Looking to change trans and rear end fluids that are currently 303 hydraulic oil. Original fluid was mild Extreme Pressure SAE 80W. I've found a few 90W GL1 gear oil products but seems there are a lot of 80W90 GL5 oils but Im not smart on the GL classifications and have read concerns about yellow metal protection. Dont even know if mine has yellow metal in trans/rear so thats why asking.
 
GL1 rating is no longer enforced so anyone can call their oil GL1. I still have to use GL1 in my bulldozer because GL5 will plug up the
wet steering brake bands. I use 40 weight non-detergent motor oil which is the same thing as the old SAE 90W GL-1.

I have a Ford 641 and have used GL5 90W oil in it for many years. NO yellow metal in the Ford that I know of, plus many GL5 oils are now
yellow metal safe anyway.

Now adays - GL5 is NOT good to use in synchromesh transmissions. Again, no problem with your Ford.

303 oil is only 20 weight viscosity and I'd rather have the GL5 90W which is 30 weight viscosity. Plus the GL5 gives better metal wear
protection.
 
I have about 3800 original hours on my '63 2000, never having a wrench proper on the drive line, including the engine proper, other than a PTO seal and
used GL-1 for years. These trannys are non-synchronous so there are no syncing discs made of brass of which I know. I have pinhole leaks in my
hydraulic fluid lines inside the bottom of the tranny case and it has been diluted with 134 AB trans-hyd fluid for the 25 years at least, I've had it.....so when
I drained and filled with new fluid, the tranny and hyd sumps got the same fluid. Diff sump still running gear oil like OEM.
 
I would stick with a universal fluid like New Holland 134 in all three reservoirs. That's the current New Holland recommendation for your tractor. If you use gear oil in the trans and diff, it can contaminate the hydraulic system and cause problems.
 
Either GL-5 80W90 or CNH 134D or equivalent is fine in transmission and differential.

I use 134D in all three sumps because usually (always?) one or both of the compartment seals leaks.

Dean
 

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