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Little advice with mods please


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Posted

Finally found the wheels I wanted, 20x10 chrome with toyo 35x12.5. been on a 3.5" level with 305's. Ordered the Mcgauphy 7-9 ss kit wheels, rubber. I have two weeks before installation. My truck is a 14 black hc with 6.2/3.42 4x4. I like the looks of black and chrome, my grille, and headlight surrounds are colormatched black, door handles, mirror caps chrome should go well with chrome wheels.

My question is should I be upgrading the struts, or go with coil overs? The guy at mcgauphy stated their struts are good, and they don't offer the bilsteins anymore.

Also I read somewhere that someone regeared to 4.56 and is averaging 16-18 city, and 22 highway with 35's. Gas mileage isn't critical to me (obviously) I'm running a 4x4 as a daily work truck, but interested if regearing will be necessary with the larger rubber.

Thank you for reading, and insight with photos... :)

Posted

Can't really answer on the coilovers but they usually ride better. On someone getting 22 HWY and 18 City with 4.56s and 35s. That is a straight load of horse crap IMO. Don't believe everything you read on forums, people fudge the numbers a bunch.

Posted

35s are tall enough that lower gars will help some acceleration to be regained. I agree with Ryan about mileage. My guess is 10-12 around town, maybe 12-13 hwy. A lot depends on how you drive. But a 8" lifted truck with 12.50 x 35 tires is going to take a lot of gas to move it along.

 

Guys that do big tires and lifts don't talk about mileage much. Big tires make a big dent in mileage. Tall lifts take a big bite at highway speeds.

 

My crew 6 1/2 ft, 5.3L, with a level, 12.50x33 tires, gets 12-13 city, 15 hwy. ymmv.

Posted

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35s are tall enough that lower gars will help some acceleration to be regained. I agree with Ryan about mileage. My guess is 10-12 around town, maybe 12-13 hwy. A lot depends on how you drive. But a 8" lifted truck with 12.50 x 35 tires is going to take a lot of gas to move it along. Guys that do big tires and lifts don't talk about mileage much.

My crew 6 1/2 ft, 5.3L, with a level, 12.50x33 tires, gets 12-13 city, 15 hwy. ymmv.

Thanks,

mileage isn't a big concern, but if some is gained by re-gearing it helps in my justification process.. lol. Thanks for the feedback. I used to love the look of my truck, now i hate it... Hope this project gets it back

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Posted

I took about a -2mpg dent when I went with 20x10 -24 and 33x12.50 mud terrains. I knew it was going to happen but you have to pay to play. For what it would cost to regear your truck, I would think it would just be cheaper to pay the additional cost at the pump.

Posted

I took about a -2mpg dent when I went with 20x10 -24 and 33x12.50 mud terrains. I knew it was going to happen but you have to pay to play. For what it would cost to regear your truck, I would think it would just be cheaper to pay the additional cost at the pump.

 

Thanks, I'm hoping it doesn't downshift everytime I hit an overpass on the interstate, usually cruise around 80 on the highway here in Florida. If it doesn't wanna stay in 6 I will likely regear.

Posted

Florida is as flat as East Texas. I have a 6.2 with 3.23 rear gear turning 35X12.50/20's on a 6 inch lift and feel no reason to re-gear.

Posted

Yea, they would have to show me on paper with receipts and hand calculations how that are getting 16-18 city and 22 hwy mileage with a 4.56 gearing in the rear. It is possible that someone might be able to get the stated mileage with a 4.56 rear end ratio but there transmission would have to be vastly different from any normal stock GM tranny that's been used in the last 20-30 years. I struggle to get that on a good day with stocks and 3.42 rear.

 

With that said, to answer your question, yes re-gearing will help you with mileage turning 35's but you will never get back to the stock mileage. There is a simple calculation that is used to determine what the new gearing should be when adding bigger than stock tires. See the following link to another thread that covers this topic and the formula in depth:

 

http://www.gm-trucks.com/forums/topic/189486-regearing-truck-after-lift-kit-and-35s-tire/

 

Following that calculation, the rear end gearing for 35's that would give you the same ratio (theoretically) as stock would be a 3.86. You would then want to find the next closest available gearing to 3.86 which should be either a 3.73 or a 4.10.

 

Honestly though, unless you are really worried about loosing some acceleration power, I wouldn't re-gear for 35's. really not worth the hassle in my opinion and if you do want to re-gear I would go with 3.73 since that is a standard option in these model trucks.

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