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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!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | I have found the 4 bolt side cover transmissions without a drain plug with 61 up date codes. Since it has the rear mount it is at least from a 58. There was a time when manufacturers determined that changing these fluids wasn't necessary. Those of us that believe in maintenance think this was a wrongheaded approach. I suppose they had no idea these vehicles would last this long.
You should be able to drain some of the oil by removing the lower bolt that holds the tail housing to the case.
Just put some sealant on it when it is reinstalled. A lot of mixing and matching went on with these trucks over the years.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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