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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: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | I have not been able to find any date codes on the BW units I have worked on. A general rule would be: 55-57 cars & trucks did not have a rear mount on the OD unit. 58 up cars used a rear mount and the mount holes were drilled out. 58-65 trucks would have the mount boss but some were not drilled. They were all the same basic unit and will interchange. If you have a transmission case that has the extended casting area you can drill the hole for the reverse shaft. Your 58 case should be OK. Some of the cases will not work.
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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