i hear people talking about upgrading there gears if they get lifts.. whats the point of this and the benefits.... if possible some prices...

 

The benefit is that you get your truck running at the right RPMs vs MPH. My truck was a dog with the 3;55s and 35 tires. I paid $1350.00 for 4;56s

 

When you add a taller tire, the engine will be operating in a lower RPM range and perform slugishly.

 

To re-iterate what Wandell pointed out, you want the RPM range to be sufficient to carry the added weight of larger tires. Thus with a lift, you would garner larger tires and have more weight. The more weight added to the truck in the form of rolling resistance, the more sluggish the engine feels because the RPM range is now out of the "sweet spot" if you wheel.

Take a look at the chart.

http://www.4lo.com/calc/geartable.htm

 

thanks for all the good info, i just became a member the other day so i could clarify some questions i had, this is the best website out there....