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| | | Forums66 Topics128,035 Posts1,055,564 Members48,426 | | 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
with Ads!  Again, thanks!
| | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | The original 420 4 speed with a 411 rear end will do 50 mph but really is wound up in 4th gear. Using this calculator and figuring your tires are 31" tall, your babying your engine. At 3000 rpm (way below the 4000 rpm limit) you should be in the 69 mph range. These engines were made to run all day long at 3000+ rpm. https://spicerparts.com/calculators/transmission-ratio-rpm-calculatorMike B  | | |
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