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| | | Forums66 Topics128,036 Posts1,055,448 Members48,422 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | Climberman, I just was over at Jolly's GMC site and saw just what we are looking for. He has a step by step procedure converting a SM 318 3-Speed to a SM 420 4-Speed, with great pictures to boot. Check it out at: http://www.6066gmcguy.org/3-to-4-speed.htmBill
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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