Gear ratio leads to less top end?

[Joopin]

I was looking on the net for a regear chart for when I get new tires and I found this... http://www.off-road.com/toyota/taco/tech/axle/gearchart.html My question is, according to the chart, if I get a higher gear (#) to get "more power" what will I loose? Is it the high end I will loose? Low end? I was going to regear to return to stock performance but I was just curious about the "more power" part of the chart on that site. Thanks for the help

 

[jps4jeep]

They way most companies figure out what gear would be acceptable, is based on the engins speed. If you factory gears have your engin revving @ 2000 rpm at 60 mph, The idea is to have the new gear do the same. So if you went with a set of 4:56 with 33 inch tires, @ 60 mph, your engine would be reving at about 2200-2300 rpms (not real numbers)

All with the same tire size- If you go to a higher gear (numrically lower) The RPM's at 60 mph would also be lower, allowing the car to go faster due to larger power band (obviously this doesn't apply to jeeps, they just don't come out of 4th gear on the highway), and more economical on the higway. the car won't accelerate that fast though.

If you "gear down" (numrically higher) You loose top end, but the car accelerates a lot faster.

Johnny

 

[Bounty__Hunter]

The lower the gear ratio (higher number) the more rpms you will run on the highway, so you may not be able to run as fast for as long, and will use more fuel on the highway. What you get is quicker acceleration and a slower offroad crawl speed.

 

[jps4jeep]

Does this sound like a good price?

Man I took my stupid pill this morning, I can't even spell engine

 

[Joopin]

Okay cool, so I will just shoot for close to factory performance... if I end up getting 35s I will get a 4.56 ratio. I really don't need a slower offroad crawl like Bounty was saying... it is still my daily driver and I need a good cruising speed. I wanna hear those meats hum! Thanks guys.

 

[Bounty__Hunter]

Regearing only compensates for the increased tire size, if you keep the rpm close to stock, and does nothing to compensate for the increased rotating mass. If you are undecided between two different ratios, I'd lean towards the lower gears to help compensate for the added rotating mass. It will take a lot more to get those heavier tires moving.