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Click on image for the lowdown. 
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9 members (MikeStone1953, Hanks custodian, Gdads51, Shade Baby, rfs56trk, sron48, dt235sd, Keepinthemstockm, TUTS 59),
66
guests, and
2
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,084 Posts1,056,333 Members48,442 | | 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!
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#12297 10/09/2002 9:04 AM | Joined: Feb 2000 Posts: 268 Shop Shark | | Shop Shark Joined: Feb 2000 Posts: 268 | Have a look on this wen page, it's for the SM-420 4-speed, but at the bottom of the page there is a chart with the ratio's for the SM-318 too. 6066 GMC SM420 Trans Page. Fogot the link  | | |
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