As long as I have everything apart for a clutch replacement, I'm replacing the rear main engine seal and the transmission seals, etc.
What is the preferred oil for use in the 3 speed manual transmission?
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
If memory serves me the traditional 80/90 is what is used. I just rebuilt mine and am going to put some fancy AMSOIL 80/140 or something to that effect in it.
I just rebuilt mine and am going to put some fancy AMSOIL 80/140 or something to that effect in it.
Really bad choice- - - - -the super slippery synthetic lube will prevent the synchronizer rings from gripping the gears, and you'll end up with a lot of gear grinding, particularly on a downshift. Those heavy gears have enough inertia that synthetics don't work well in them. The straight 90 weight mineral oil (not hypoid) that's specified for Ford N-series tractors is exactly what stovebolt 3 and 4 speeed transmisisons need. Our local source in the southeast USA is Tractor Supply Company, but I'm not sure if that business operates in other parts of the country. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Thanks a lot for all the replies. I know the manual specs 90 but thought with 70 years of exponential improvement in oil technology something else might be more appropriate.
We do have Tractor Supply here and my dad has a '52 8N.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
Sorry about that Otto. Yes, it's my 4 speed gearbox (transmission)
Craig
My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.
The straight 90 weight mineral oil (not hypoid) that's specified for Ford N-series tractors is exactly what stovebolt 3 and 4 speeed transmisisons need. Our local source in the southeast USA is Tractor Supply Company, but I'm not sure if that business operates in other parts of the country. Jerry
Here is what Jerry is talking about and what I use in my ‘52 3100 three speed.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
The GL1 oil supposedly does not have sulphur in it. In the Ford tractor there are brass components that can be affected by the sulphur content. I think the other oils do have sulphur which is a good lubricant under pressure, like gear to gear contact points. this is what I have been told over the years.
I believe anything up to and including GL-4 doesn’t have sulphur added. At least that’s what my research has revealed. GL-4 is more heavy duty than lower numbers and isn’t too hard to find.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
What I used was from a red&white Amoco 5 gal bucket that simply said "90 wt gear oil" that had been in the shop since the 80's. Looked as new as this morning. May be why it still slips out of high gear... I'll switch.
Last edited by Jethro in Va; 11/10/202212:41 AM. Reason: Added
~~ Jethro 1954 3100 Back to Life In the Dity Gallery 1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020
