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3.08 Gears and 35s


bholden

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Posted

I need help ....I have a 2015 GMC Sierra 1500 Z71....I'm wanting to put a 6 inch lift with 35x12.50/22 on. My question.... is it possible with the 3.08 gears to go with this setup on my truck. I was told that 3.08 gears are for highway/fuel economy...not for pulling or tall tires.... Will 35s be too tall for my gear set?...I'm currently running 33s and its not really making a difference (I don't think )....please help I don't even know where to begin

 

 

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Posted

I need help ....I have a 2015 GMC Sierra 1500 Z71....I'm wanting to put a 6 inch lift with 35x12.50/22 on. My question.... is it possible with the 3.08 gears to go with this setup on my truck. I was told that 3.08 gears are for highway/fuel economy...not for pulling or tall tires.... Will 35s be too tall for my gear set?...I'm currently running 33s and its not really making a difference (I don't think )....please help I don't even know where to begin

 

 

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No not a big difference. Noticeable but won't kill the truck.

35x12.5r20

6" lift

And I have 3.08.

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Posted

What's is the difference...as far as the shifting ??...cuz honestly....this is the first 4x4 I've ever own ...I love the look of a lifted truck but damn I paid too much for it to be swapping gears and stuff ...you know??

 

 

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Posted

What's is the difference...as far as the shifting ??...cuz honestly....this is the first 4x4 I've ever own ...I love the look of a lifted truck but damn I paid too much for it to be swapping gears and stuff ...you know??

 

 

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Just makes going into 6th happen less "if" you're dealing with a lot of hills. If I don't drive like an **** I can still get 16mpg. And a lot of guys will say it puts too much stress. But I don't think so. I pulled a 10klbs trailer 1680 miles in two days without any abnormal heat. I will eventually get different gears. But I'm not worried about it right now. post-137629-145611049804_thumb.jpg

 

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Posted

Is there anyone else that's wanna chime in with 3.08 gears on there trucks or know a lot about rear ends....the more opinions the better...

 

 

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Posted

3.08s and 33s here.....

 

Truck hunts for gears a bit but 4.10s are going to solve this problem real quick lol

 

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Posted

I have 3.08 gears and was the main reason I did not go with 35's. I went with 33x12.50 and a BB tune is on the horizon. 2" more lift and 35 wasn't worth another K to regear to me. Mine runs fine, but I don't ride the pedal hard anyway.

Posted

I ran 3.08 gears with my 2012 Silverado with a 6in lift and 35in tires and I put 95K miles on that truck with zero tranny issues. I don't think it puts any more stain on the truck than other gear choices.

 

However, what did find was that if you have a strong head wind or your going up and down hills the truck will shift into 5th a lot more. The cruise control will also shift a bit more. I pretty much always stayed in 5th while pulling my 7k pound boat and shift into 4th a good bit.

 

Now I'm running the same lift and tires with the 6.2L and 3.23 gears and the truck never shift out of 6th on the highway or pulling my 7k pound boat.

Posted

33' and 3.08's here. The shift points will be a little off, along with the speedo. Either a handheld tuner or a custom tune can help with that. My truck drives better with the 285/70R17's than it did with 275/55R20's. The transmission might work a bit harder but no different than if you were towing a small trailer. You'll be fine.

Posted

I have 3.08 gears and was the main reason I did not go with 35's. I went with 33x12.50 and a BB tune is on the horizon. 2" more lift and 35 wasn't worth another K to regear to me. Mine runs fine, but I don't ride the pedal hard anyway.

im running 305/30/26 (33.4 inches) right now and I noticed the shifting is a Little squirrelly ...it's not terrible but noticeable...now would a tune (Diablo,Black Bear etc) remedy that??

 

 

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Posted

33' and 3.08's here. The shift points will be a little off, along with the speedo. Either a handheld tuner or a custom tune can help with that. My truck drives better with the 285/70R17's than it did with 275/55R20's. The transmission might work a bit harder but no different than if you were towing a small trailer. You'll be fine.

are you running a hand held tune on your truck right now ???

 

 

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Posted

are you running a hand held tune on your truck right now ???

 

 

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I skipped the handheld and went with a Black Bear Performance tune. The canned tunes on a handheld tuner are good enough for tweaking shift points and reprogramming the speedometer. IMO you get a lot more bang for the buck with mail order or custom tunes.

Posted

 

I skipped the handheld and went with a Black Bear Performance tune. The canned tunes on a handheld tuner are good enough for tweaking shift points and reprogramming the speedometer. IMO you get a lot more bang for the buck with mail order or custom tunes.

man I wouldn't even know where to begin with a mail order tune

 

 

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