I have been driving my truck sence the weather has been nice but the Rpm around 60 mph is 2600 rpm what would a good rpm to be doing say around 65 mph. The truck has 4 on the floor with the granny gear and the rear end is out of a 98 chevy truck i think its a 3/4 ton.
What engine do you have and what rear gear? At that RPM, I would say you have somewhere around a 4:11 or lower. Move to around a 3:50 to 3:08 for highway driveability.
The formula used for determining RPM given MPH, axle gear ratio, transmission gear ratio, and tire size is the following: mph X 336.1524 X final drive ratio รท tire diameter Or, the UN-simplified long version: mph X 12 (inches per foot) X 5280 (feet per mile) X axle gear ratio X transmission gear ratio pi (3.14159265) X tire diameter X 60 (minutes per hour) I hope this helps.....Big Tim
All You Need : Now , is a Tachometer and don't exceed 3,000 RPM unless you're accelerating and up shifting . This assumes you're running an L6 engine , 216 , 235 or 261 .
The motor is a 235 and the rear end don't know what kind of gears but i have a friend that will look at it and let me know and swap them out. I was just wanting to know what would a good RPM for cruzing down the road at around 65 mph. I was thinking 2600 seamed kind of high for the motor but i could be wrong.
