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Click on image for the lowdown. 
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7 members (baldeagle, Southerntruck, Hanks custodian, Woodcmiami, J Lucas, Rusty Shackleford, TooMany2count),
79
guests, and
1
robot. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,133 Posts1,056,398 Members48,441 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Feb 2011 Posts: 583 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 583 | Replaced a leaking right rear axle seal. What brand/weight gear lube should I use for a stock 1939 Chevy JD Stake Bed 3/4 ton?
Rick
1939 Chevrolet Stake Truck
| | | | | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | | | | | | Joined: Feb 2019 Posts: 4,483 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,483 | Before you go out and buy S.A.E. 90w oil, you must find out if you rear contains hypoid gears. I have a ‘52 3100 and I use 90 weight multi-purpose gear lubricant not the 90 weight mineral oil that I use in my tranny. There is a caution in my shop manual that states “CAUTION: Straight mineral oil must not be used in Hypoid rear axles or two speed axles.”
I would suspect your’s is the same, but we need on of our “experts” to chime in.
Last edited by Phak1; 03/18/2021 1:02 PM.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 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 BrakesProject JournalsStovebolt Gallery Forum | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | 1939 3/4T JD - (Commercial -3/4 Ton-3 Stake Pockets - Wheelbase 123 3/4in.) some information on lubricants - 1940I could not find 1939 information. | | | | | Joined: Feb 2004 Posts: 29,814 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,814 | On a "hypoid" axle, the pinion gear will intersect the ring gear below its centerline. If the driveshaft is below the center of the axle tubes, it's a hypoid axle.
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!
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