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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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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: Nov 2011 Posts: 2 New Guy | | New Guy Joined: Nov 2011 Posts: 2 | I have a 57gmc napco 4x4.I would like to change the I think 3.90 gears for a better hiway gear. Any help on what works. It has 10 bolt diffs.Where can I get a rear pinion seal and front pinion seal for this truck.The trans has numbers B248-5-GM-3761930 on it. the shaft coming out of the trans to the transfer that seal I need as well. Any help would be great. Thanks Rick | | |
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