Originally Posted by FIRE UP
Hey Tom,
If I understand you correctly, you're wondering if the transmission ratios would change, if a different rear diff (and front too) set of gears was installed, correct? Well, I'm assuming that you know that, whether you purchase an available manual transmission with your Jeep or, the 5-Speed Automatic, the ratios of the gear sets in each one, remain the same, no matter what diff gears are presented to them. i think I'm trying to explain this right.
A vehicles weight, tire size, differential gears, transmission gears, aerodynamics and of course, available engine specs (V-8, V-6 In-line-6 etc.) all play a role in how it is motivated down the road or, out on the trail. The name of the game for the Automotive industry is GAS MILEAGE. That's the primary concern for any and all of them.
But, us end users, have to not only take into consideration the fuel mileage but, vehicle performance, based on individual use and requirements. For instance, while gas mileage is a concern for us, it's more important for me to be able to use less throttle for almost every given situation in driving, by having a bit more lower ratio'ed set of gears, to allow for the average power of that V-6 to be able to be used, every time we enter and drive that Jeep.
A side story. A good friend was traveling with his wife in there later model Corvette in Texas a while back. He we doing right at 55 'cause he was in a section of Texas that speed laws are SERIOUSLY enforced. In that section, based on the gear ratios that were in that Vette, and traveling at the speed it was, and even with a 400HP motor, he achieved right at 31 MPG!!!!! And that wasn't what the computer said, it was actually what he got using the amount filled in the tank.
But, that set of gears etc. would not work well for a Jeep.
Scott
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