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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,088 Posts1,056,125 Members48,435 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | The GM part number has been obsolete a long time. The number I cited is out if a 1954 GMC parts book. Your engine should have enough vacuum to shift it if you don't have leaks elsewhere. You let off the gas when you upshift and that of course raises the vacuum. And vacuum is what shifts it into high range. | | |
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