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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2005 Posts: 227 'Bolter | | 'Bolter Joined: May 2005 Posts: 227 | Hey…
How often should you change the gear oil in your manual transmission and differential?
I am trying to keep track of when to change the GL4 gear oil in my manual transmissions in my 60’s trucks and also the differentials. I tried searching the forms but came up short. I might not be searching for the correct words to bring up this information.
I think time intervals are more important than mileage because these trucks are not at work often and are not my daily drivers. Any help would be greatly appreciated.
Last edited by Bornco; 03/23/2026 4:57 PM.
1960 Chevy Apache (C10)
1965 Chevy C30 Dump Truck
1966 Chevy C30 Tow Truck
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