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Mod | | | Forums66 Topics128,106 Posts1,056,213 Members48,436 | | 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
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| | | | Joined: Aug 2012 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2012 Posts: 50 | first off thanks for a great website and all the good advice.I have a 1948 3/4 ton chevy truck with stock 4 speed and a 4.57 rear end. the engine is a 1967 250 cu in 155hp chevy inline 6 that runs great. the truck has 16 inch wheels with radials. the truck seems happiest at 45 to 50 mph but will run at 55 to 65mph. no tach on the truck. Is it bad on the tranny or rear end to go that speed?I don't want to change the rear end since I use it for hauling | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | It's not bad for either. Make sure your brakes are up to snuff, and you should be fine. An OD transmission could help with interstate speeds a little. | | | | | Joined: Aug 2012 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2012 Posts: 50 | what rpms do you think the truck is doing at 60mph, my rough figures say something really high. also the truck has good helper springs in the rear. what load would be ok to pull, ( say with brakes on the trailer). would a tongue weight of 750lbs be ok. we loaded 500 lbs of feed in the truck and it did not seem to mind I have completely redone the original brake system. thanks charles | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | If you look up your tires on the Tire Rack, take the revs/mile and multiply by your rearend ratio to get your RPMs at 60 mph. | | | | | Joined: Sep 2009 Posts: 433 'Bolter | | 'Bolter Joined: Sep 2009 Posts: 433 |
1954 Chevy 3104 3 Window Hydra-Matic in my family for over 60 Years
Once in a while you get shown the light in the strangest of places if you look at it right... "Scarlet Begonias" Grateful Dead 1974
| | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | I couldn't tell you rpm at a given speed without knowing the exact tire size, or at least a rough idea of the tire diameter.
30 inch tires
60 mph at 3064 rpm
70 mph at 3575 rpm
32 inch tires
60 mph at 2873 rpm
70 mph at 3352 rpm
32 inch tires with typical 27%OD transmission
60 mph at 2097 rpm
I can't answer your weight pulling question. Old trucks used to work hard all the time. They just went slower when they worked. Local restrictions might dictate what a truck can and can't pull. Be sensible, stay out of the left lane and use common sense.
70 mph at 2447 rpm | | | | | Joined: Aug 2012 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2012 Posts: 50 | great advice.. thanks for all the good info
55mph will be my top speed in the left lane, no IH 35, only county roads and state highways, light hauling no big trailers. really enjoying the old truck . thanks again all. | | |
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