Look here, near the bottom of the page, http://www.onlineconversion.com/bigger_tires.htm

The short answer is no, not for long.
To go 65 regurlary you need even faster gears than 4.10, with only 4.10 and 28" tires you have to turn 3200 rpm, and that's more than a 235 wants to run for a long time.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-