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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!
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#79110 06/23/2007 2:22 PM | Joined: Nov 2006 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2006 Posts: 84 | I have a 1948 GMC 3/4 ton with a floor shift 4 speed. I was going to run down to the flaps and pick some gear oil to change it out. What type and weight do you guys use? How much do I need to get?  Thanks for the info. | | |
#79111 06/23/2007 2:46 PM | Joined: Jun 2005 Posts: 1,756 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 1,756 | 90 wt. seems like a qt would do it. It never hurts to have a extra qt on hand for the diff. too. Someone else? | | |
#79112 06/23/2007 3:01 PM | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | i use 80/90 weight.
many transmission aces recommend non-synthetic because, in theory, the synthetics are too "slippery" to allow the syncros to stick a little and line the gears up. makes sense to me, so i use good old left over dinosaurs. | | |
#79113 06/23/2007 5:07 PM | Joined: Mar 2007 Posts: 863 Shop Shark | | Shop Shark Joined: Mar 2007 Posts: 863 | I think you will need 2-2 1/2 QTS any extra is spare
for the steering box, rear end. | | |
#79114 06/23/2007 5:54 PM | Joined: Nov 2006 Posts: 84 'Bolter | | 'Bolter Joined: Nov 2006 Posts: 84 | Great.
thanks for the info guys. I will go pick up 3qs of 80-90W non synthetic gear oil. | | |
#79115 06/23/2007 6:08 PM | Joined: Apr 2007 Posts: 147 Shop Shark | | Shop Shark Joined: Apr 2007 Posts: 147 | I have been using synthetic oil in all my vehicles for the last 26 years with excellent results. This includes the engine, transmission ( automatic or standard ), transfer case, and rear end. The gear lube I used to recommend was the 80W-90, but the newer 75W-90 has a higher film strength and has a pour point of -50 degrees.
Bob
55 Cameo 396 TH 400 with overdrive
65 Caliente conv
67 BB Caliente conv
67 Mercury 1 Ton
76 GMC 3/4 ton 454ci
84 Buick Turbo Regal
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