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Gear lube in 53 3600 3/4 ton truck
#1365990 Mon Jun 22 2020 09:35 PM
Joined: Mar 2017
Posts: 199
E
Elmo Offline OP
Shop Shark
How many bottles of 80/90 gear lube goes inside of my transmission?
How many bottles do I need to buy??
Thanks guys and gals...
Elmo

Last edited by Elmo; Mon Jun 22 2020 09:46 PM.
Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1365992 Mon Jun 22 2020 10:10 PM
Joined: Mar 2004
Posts: 4,604
M
Shop Shark
The SM-420 holds about 6.25 pints of SAE 90 Mineral Oil.

Here's what I use...

https://www.tractorsupply.com/tsc/p...-all-mineral-90-transmission-fluid-2-gal

Mike B smile

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1366670 Sat Jun 27 2020 03:29 PM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Would I use this same SAE 90 mineral transmission oil in the rear differential?


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Gear lube in 53 3600 3/4 ton truck
Spotbiltxo #1366686 Sat Jun 27 2020 04:51 PM
Joined: Jun 2004
Posts: 8,211
W
Master Gabster
Originally Posted by Spotbiltxo
Would I use this same SAE 90 mineral transmission oil in the rear differential?

NO! You must use gear lube rated GL5 in the rear end. I like 85/140 viscosity. It also holds about 6 pts.

George

Last edited by Wrenchbender Ret.; Sat Jun 27 2020 04:54 PM.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1366754 Sun Jun 28 2020 01:27 AM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Thanks George. I think I’ll make a trip to Tractor Supply tomorrow to pick up some of your recommend gear lube, then change mine. Haven’t peaked inside the pumpkin in the 12 years I’ve owned the truck.


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1366911 Mon Jun 29 2020 01:25 AM
Joined: Mar 2004
Posts: 4,604
M
Shop Shark
This is what you use in your rear...GL-5 Hypoid Gear lube rated for extreme pressure.

https://www.tractorsupply.com/tsc/product/traveller-80w-90-gl-5-gear-oil-6-1-quart

Sold everywhere, not pushing Tractor Supply, their links are easy for me to find to give you the specs.

Mike B smile

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1367297 Wed Jul 01 2020 01:22 PM
Joined: Mar 2017
Posts: 199
E
Elmo Offline OP
Shop Shark
Ok now I’m really confused, I’ve heard people say to use a GL5 in the transmission and I’ve heard people use GL4 in the transmission.
Which one is it?
Elmo

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1367305 Wed Jul 01 2020 02:31 PM
Joined: Aug 2018
Posts: 246
D
Shop Shark
Elmo, GL4-rated fluids are recommended for transmissions. They promote smooth shifting and are synchronizer-friendly, especially important for gearboxes that may have "yellow metal," brass/bronze components. The mineral oil recommended by Mike B. is rated GL1, and OK for older transmissions that don't require a higher level of protection. GL4-rated fluids are better products in that regard, but generally cost a bit more. My go-to is Red Line Oil MT-90 which is GL-4 rated, FWIW, since it's what I keep in my shop to service several newer vehicles.

GL5-rated fluids are recommended for wear protection of the hypoid gears used in rear differentials. Once again, FWIW, I use Red Line Oil 75W90 or 75W140, depending on what's called for, and because it's what I have in my shop for the same newer vehicles (BMW, Nissan).

There seems to be a bit of debate in the forum, but the sulfur content in GL5 fluids may promote corrosion of brass/bronze components, and they are generally not recommended for transmissions (which do not use hypoid gears) and so the increased level of protection isn't needed.

Hope that helps.

Doug

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1367378 Wed Jul 01 2020 11:08 PM
Joined: Mar 2004
Posts: 4,604
M
Shop Shark
Some of the newer transmission lubes are to slippery for our old transmissions, it doesn't give enough resistance to slow the gears down when shifting which can causes grinding between gears...

Mike B smile

Re: Gear lube in 53 3600 3/4 ton truck
Elmo #1367394 Thu Jul 02 2020 02:16 AM
Joined: Jun 2008
Posts: 1,445
S
Shop Shark
Thanks for the info on diff fluids and the link to what Tractor Supply sells.


Chuck
1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
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