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Iv been trying to decide how much I want to lift but it really comes down to not completely destroying the MPG and power I like so much. I really wish someone would offer 3.73 gears but I am out of luck on that front so far. Is anyone running the 4.10 set and how has it affected the truck so far. Also what tire size are you running if you have the taller gears.
 

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Even if you did re-gear to 4.10's, you would still lose fuel mileage, since the object to go thru this, is to run larger/heavier/wider/more air pushing, tires. I screwed around with Jeep TJ's and it was a losing battle, gained a little but not like "stock", so I imagine it would be the same with these trucks. Good luck tho. Mac:)
 

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You’re going to lose mpg if you lift it. No way around it. If you are stock now, it’s possible to minimize your loss with a tune. I was averaging 27-28 consisting of a 35 mile trip to work and some stop and go thrown in. After the Zone lift and 33s and currently running an “optimized stock” tune and correcting for tire size, I’m at 24 mpg. Once I get the exhaust done, it may improve a slight bit more.
 

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Is anyone running the 4.10 set and how has it affected the truck so far. Also what tire size are you running if you have the taller gears.
I've got 4.10s with the 5.5 BDS lift, 34" (285/75/17) Falken Wildpeaks, and DuramaxTuner tuned (I usually just run #1). At 60Mph I can get 27-30mpg. With the regear and 34's then 60mph is at around 1650rpm which is a sweet spot for mileage. Up at 70mph though is close to 2k rpm (1916 actually) and the milage falls off a cliff. I'm happy with the regear since it really gave me my power back (before the regear the truck had a very difficult time getting into 6th gear on the highway) and most of the highways around here have a speed limit of 55 so I usually just cruise at 60mph. If you go with smaller tires, like 33's, then those numbers will be about 50rpm higher but pretty close to the same.

A word of caution though, it would be worth finding a gear shop that has worked on the gen2 colorado before since the front diff on these can cause a lot of headaches for a shop that is used to only doing jeeps (I had to have a second shop redo my front diff after the first one spent 2w with it and said it was "done" but was effed up). Also, if you're getting the Nitro 4.10 gear set I'd suggest two things:
  • Get it from them directly instead of through a distributor so it will be easier to deal with warranty stuff, or have whatever shop is doing the work buy it.
  • Before ordering call them and see if you can get the thicker ring gear for the front instead of the thinner gear with a spacer. They just started having them made and it's a much better option than dealing with the bs spacer they tried to use initially with the 4.10 set.
 
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