Lift and Gears ?'s

hunting Z71 · September 21, 2005

I have got an '01 Z ext. cab and i am going to lift my truck in about a month or so, with a 6" Fabtech lift with 315's terra Grappler's on 16x9 helo guns. 1) I was wondering what would be the difference in gas mileage, cause I know there will be. I get about 13.5 in the city and about 16.5 highway. 2) I was also wondering if I were to install new gears would that help with gas mileage? Or would a chip be better b/c of price? 3) Also is there a way to get the speedometer back to the right speed after the install of the lift?

Thanks.

DN1911 · September 28, 2005

gas milage will drop with the larger tires. if you want it to stay reasonanly close you need to change the gears. the average rule of thumb is: 4.10's with 33" tires and 4.56's with 35" tires.

the chip wouldn't help any with mileage, at least not in a good way. it will make more power but it will just burn more fuel.

the speedometer can be fixed. i think yours is electronically controlled and you will need some type of electronic device to adjsut it. whoever you buy the lift and tires of should be able to better help you with this issue.

Wingnut · September 28, 2005

Yes, you'll need new gears. They'll help a little with gas.

Yes, you'll probably need a tune (chip) to recalibrate the 'puter for the tire size.

Yes, the chip will make your fuel mileage better.

You can spend the same amount on gears and a tune as you spent on the lift, and if you're lucky...Only drop a mpg or two.

hunting Z71 · September 28, 2005

What all would I need to buy with the gears?

What is a good brand to buy?

DN1911 · September 28, 2005

the 4wd shop that did mine, only uses precision gears and bearings. you might want to look up Randy's ring and pinion on the net. they had some of the better prices when i was shoping for parts. but that was a while ago. definitly do some research. 4wd magazines tend to have a lot of advertisers in them, it would be a good place to start.

Precision Gear

Randy's ring and pinion

killerZ-71 · September 28, 2005

you can change gears if you want to, but you definately don't have to. i lifted my '01 z-71 and the gearing is just fine. i am running 33's on 17x9 and my

speedometer did not change at all. i drive by these radar boxes our town puts

out on the side of the road to show you how fast you are going, and mine

is always right on. all i am saying is that you can get the lift/new wheels/tires,

and you will be set to go. gears/brakes/ everyting that you already have will

be good to go. any changes you make are optional.

hunting Z71 · October 4, 2005

I have changed my mind on tires. I am going to get the bfg mud's but i will still have everything else the same. I ordered it all yesterday. Thanks for all ya'lls help, i dont think will not get new gears just yet b/c of price but i think i will get the chip.

camel · October 4, 2005

randy's ring and pinion has the best prices. can't go wrong with those guys.

hunting Z71 · October 11, 2005

I finally got it lifted but I think I am going to wait on the gears and perfomance chip until christmas. I ended up getting the Fabtech 6" lift with the moto metal 951's 16x9 and bfg 315 mud tires. thanks for all yalls help.