01-12-2007, 10:43 PM | #1 |
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Location: Brownfield Texas
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1997 gmc sierra z71
I have a 97 gmc Z with a 3 inch body lift and a 4 inch suspension lift and 35 inch tires. My question is what can i do to get better gas mileage? Im thinking changing the rear end gear ratio, and front. But i dont know the stock ratio. If any of you have any suggestions or info on the ratio. Please let me know. Thanks
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01-12-2007, 11:39 PM | #2 | ||
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Re: 1997 gmc sierra z71
I went back and found this thread that should help with your prob.
Quote:
Quote:
Also this link will handle any gear/tire combo ?'s. http://www.izook.com/gearcalc.htm Lastly, I haven't lifted any of the 88-98 trucks, but I would say 7"'s is possibly excessive for 35" tires. I have adequately cleared 37's with a six inch. You might consider eliminating the body lift. I see a lot of trucks on the road that could easily cut their lift in half and have better road manners and a lower center of gravity. The whole purpose of a lift is to strictly clear a tire size. Any height above that is wasted. I am a fan of low lifts and fender trimming. You can only wheel as deep as your axle allows you anyway. Good luck.
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01-13-2007, 12:02 AM | #3 |
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Re: 1997 gmc sierra z71
Thanks for the info.
About the lift, As it is now, my tires still rub turning lock to lock. but i know i could loose a good inch off the rear end because of the angle that the truck sits at. noses down prety good sitting there. Road manners are good, truck drives great. I dont really have a major problem with anything else except gas mileage. |
01-13-2007, 12:15 PM | #4 |
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Re: 1997 gmc sierra z71
stock ratio with a Z-71 is 3.73
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01-14-2007, 02:39 AM | #5 |
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Re: 1997 gmc sierra z71
thanks for the numbers. So im thinking some 4.10 gears would bring my truck back to stock final drive and maybe get some better mileage out of it. Whats a good place to get front and rear gears.
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01-14-2007, 08:43 AM | #6 |
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Re: 1997 gmc sierra z71
OPen the gloveobx and look at the RPO codes. Find the ones that start with a "G". 3.73 will be a GT4, GT5 will be 4.10s, and GU6 is 3.42s. Quick and easy way to find what gears you need with a certain size tire, divive the new tire by the old tire, then multiply that by the current gear ratio. So if you have 3.73 with 35s, then a 4.10 would bring it close to stock. But your not gonna get decent mileage out of a 4wd that has bigger tires on it. My old is b!cthing about that now. He has a 98 2500HD with a 454, 6" lift with 35s. It has 3.73s, and still goes OK, but 4.10s would be better. But he still isn't gonna get much better mileage.
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01-14-2007, 09:15 AM | #7 |
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Re: 1997 gmc sierra z71
Just wanna say welcome to the board from South Mississippi!
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01-14-2007, 03:51 PM | #8 |
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Re: 1997 gmc sierra z71
thanks for the tip. its about 8 degrees outside so im not going to even bother going and checking haha. thank you krue for the welcoming. i have been looking for a forum with good knoledgable(sp) people to help me out with my truck. Another question. start up takes a bit longer then i would expect, it sits and cranks for awhile till it will start up. I didnt know if thats just what the tbi does after it gets over 100,000 miles on it or what. The truck at the moment has 127,000 miles on it. Im not sure of whats been maintnence before i bought the truck so whats good places to check/replace.
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