Gear Oil
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Fleet Mechanic
Joined: Apr 2017
Posts: 1,391
Likes: 106
From: COSMOS
Gear Oil
I planned to use 75W90 oil in my 3.03 trans & open differential.
I found Lucas Oil LUC10043 Oil SAE 80W-90 Heavy Duty Gear Oil on sale. Is the Lucas safe to use instead ?
I found Lucas Oil LUC10043 Oil SAE 80W-90 Heavy Duty Gear Oil on sale. Is the Lucas safe to use instead ?
Cargo Master
Joined: Feb 2006
Posts: 3,009
Likes: 250
From: North Pole, Alaska
No problem as it is close in viscosity. The W stands for winter use. The lower number is best for cold weather operation. The higher number is best for hot use. Where are you located?
Thread Starter
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Fleet Mechanic
Joined: Apr 2017
Posts: 1,391
Likes: 106
From: COSMOS
My final decision for 3.03 transmission fluid. (until I find a less expensive substitute) 
GEAR OIL, SAE 75w-90, Motorcraft Manual Transmission Fluid, Full Synthetic, GL-4, quart, replaces SAE 80W-90, API GL-4 spec specifically for manual transmissions, API GL-4 spec provides proper lubrication for synchronized manual transmissions without causing excessive wear on the brass blocker rings that an API GL-5 spec oil will do, This fluid is also backwards compatible with GL-3 spec fluids, Manual transmissions, especially Ford Top Loaders, are designed to need some amount of friction to mesh the synchros, Ford 3sM/T requires 2 pints, Ford Top Loader 4sM/T requires 4 pints, Borg Warner T-10 requires 3 1/2 pints, (2 pints = 1 quart), The GL-4 spec is not optimized for rear axles and a GL-5 spec oil should be used in that application, NOT for use in rear axle differentials
GEAR OIL, SAE 75w-90, Motorcraft Manual Transmission Fluid, Full Synthetic, GL-4, quart, replaces SAE 80W-90, API GL-4 spec specifically for manual transmissions, API GL-4 spec provides proper lubrication for synchronized manual transmissions without causing excessive wear on the brass blocker rings that an API GL-5 spec oil will do, This fluid is also backwards compatible with GL-3 spec fluids, Manual transmissions, especially Ford Top Loaders, are designed to need some amount of friction to mesh the synchros, Ford 3sM/T requires 2 pints, Ford Top Loader 4sM/T requires 4 pints, Borg Warner T-10 requires 3 1/2 pints, (2 pints = 1 quart), The GL-4 spec is not optimized for rear axles and a GL-5 spec oil should be used in that application, NOT for use in rear axle differentials
WOW 
COMING FROM YOU, THIS IS AN HONOR 
EVERYONE HAS HELPED ME GREATLY...SO I TRY TO HELP WHEN I CAN 
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