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Originally Posted by CrazyCooter
I've been running 4.10's and 35's w/ TH350 for 10 years.
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TH350 is the big difference. If you're not running an overdrive tranny 4.10's are probably the best balance of economy and power.
The problem with larger tires and a 700R and larger tires, is that you can’t seem to get enough RPM’s to get the OD to properly engage. 4.88's or 5.13's would be a great choice for a 700r and 35's depending on the power production of your motor.
Assuming a true tire dimension of 35”, a vehicle with a small block motor mated to a 700R and 5.13's would spin 2241 RPM’s. Running with 4.88’s would have the engine humming along at 2132 RPM’s, only saving 109 revolutions of the motor per minute at 65mph. Most small block motors are comfortable running between 1800 and 2800 RPM’s. 5.13’s or 4.88's with the addition of OD allow this number to be on the lower end of the spectrum, while allowing for maximum acceleration and off road performance. Anything less than 5.13's or 4.88's w/35" tires will will have your tranny jumping in and out of OD when cruising along at freeway speeds.