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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: Jul 2011 Posts: 16 New Guy | | New Guy Joined: Jul 2011 Posts: 16 | What kind of top speed can I expect from the three speed 235 in my 61 c10? | | | | | Joined: Jul 2008 Posts: 1,262 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 1,262 | That really depends on what gear set your truck has in the differential and what diamter rear tires you are running. Use this chart: http://www.sierrabronco.com/TireGearRatio.htmand the following: Pulling the rear differential cover (& counting the teeth) is the most accurate method to determine gear ratio but another way to check the rear end ratio is to jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers -or- 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 ¾ turns, you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.
Last edited by Hot Rod John; 08/08/2011 12:44 PM.
| | | | | Joined: Mar 2001 Posts: 1,181 'Bolter | | 'Bolter Joined: Mar 2001 Posts: 1,181 | ...To infinity and beyond? | | |
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