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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: Nov 2014 Posts: 164 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 164 | I swapped out the 4.11 rear end in my '53 3100 with a 3.55 gear set. I have a 1960 261 in it and 27" inch high tires. What should I expect in terms of RPMs at 60 or 65 mph? Thanks!
~Denny 1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd | | | | | Joined: Feb 2001 Posts: 4,095 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 4,095 | Use this. I will let you figure, no trans listed, auto or stick.
Last edited by WE b OLD; 09/12/2017 9:20 PM.
Ron, The Computer Greek I love therefore I am.1954 3100 Chevy truckIn the Gallery 2017 Buick Encore See more pix1960 MGA Roadster Sold 7/18/2017
| | | | | Joined: Nov 2014 Posts: 164 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 164 | Thanks, I did use that but my results are quite different. For example, that calculator indicates that I should be running 2830 at 65 mph but my tach only reads 2150. I have a 3 speed on the column. What are others seeing at that speed?
~Denny 1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | What type/size tires? What measured-diameter of your tires? (not the "rated" advertized tire-diameter) 12v 6-cylinder tachometer? 3.55 rear end 1:1 high gear 27" diameter tires 65 mph 2872 at 65 mph 2651 at 60 mph http://www.csgnetwork.com/multirpmcalc.htmlI have radial trucks tires that the manufacturer shows 30" rolling diameter, but on my 6.50x16" wheels the rolling diameter is about 31.5". | | | | | Joined: Nov 2014 Posts: 164 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 164 | Well, DUH! I had the tach set on 8 cylinders. When I corrected it to 6 cylinders my numbers matched up well. Sorry for this distraction, guys.
~Denny 1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd | | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | No distraction. This post might help someone else in the future. | | |
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