Gear swap

[RickLB]

Looking to possible regear my 2017 GMC 1500 4x4 running 35" tires.  Currently it has 3.42 gears getting between 14 and 17.5 mpg. If I read the charts correctly, I should be running 4.10 gears to get back close to OEM settings, since 3.90 is not available for 4x4. Anyone else running 4.10s on a lifted truck?

Edited November 19, 2019 by RickLB
spelling

[Jacoby]

I’m running 4.56’s with a 7” lift on 35’s. Best money I’ve spent on the truck yet. 

[RickLB]

11 hours ago, Jacoby said:

I’m running 4.56’s with a 7” lift on 35’s. Best money I’ve spent on the truck yet. 

What kind of gas mileage you getting?  What year truck and is it a 4x4? What size lift and tires are you running?

Edited November 20, 2019 by RickLB

[WSFD6107]

I'm very interested in this as well. I'm running a 4" lift with 35" with the factory 3.42 gears. Looking to go with 4.56 gears to help with the downshifting at the slightest hills on the highway. I got quoted $2,800 for front and rear gear swap to Yukon. Just waiting to save up the funds.

[Jacoby]

14 hours ago, RickLB said:

What kind of gas mileage you getting?  What year truck and is it a 4x4? What size lift and tires are you running?

My best is 18mpg. 2017 crew cab 4x4. 7” lift 35x12.5x20 tires

13 minutes ago, WSFD6107 said:

I'm very interested in this as well. I'm running a 4" lift with 35" with the factory 3.42 gears. Looking to go with 4.56 gears to help with the downshifting at the slightest hills on the highway. I got quoted $2,800 for front and rear gear swap to Yukon. Just waiting to save up the funds.

Well worth the money. I paid $2250 for the swap and used Yukon gears. 

[huntr1117]

Well worth the money. I paid $2250 for the swap and used Yukon gears. 

Who did your gear swap?

Sent from my SM-G975U using Tapatalk

[Jacoby]

2 hours ago, huntr1117 said:

Who did your gear swap?

Sent from my SM-G975U using Tapatalk
 

Dallas Offroad 

[Silver_rado]

On 11/19/2019 at 6:41 PM, Jacoby said:

I’m running 4.56’s with a 7” lift on 35’s. Best money I’ve spent on the truck yet. 

Do you add a locker?

Edited November 21, 2019 by Silver_rado
Misspelled word

[Silver_rado]

Did you add a locker

[Bash74]

4.56's are no doubt the best way to go. The average cost I have seen is $2500 to be done. Now, I refuse to pay that so I just did it myself and saved the $1500.

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[RickLB]

ordered my 4.56 gears from East Coast Gear supply, now to find someone to install them.

[flyingfool]

put a locker  in it ... since your there..

[L86 All Terrain]

17 hours ago, flyingfool said:

put a locker  in it ... since your there..

Does the gear swap delete the G80 locker? Or you just mean put a REAL locker in it? 

[flyingfool]

yeah I'm talking about guys with the rear peg legger.  seen so many vids on YT about locker installs on the open diff carriers on trucks , its the easiest part to install for traction. as long as you dont hit the throttle on a  hard turn they are decent mods for simple traction   

 

there are a couple flywheel mods for the G80 gov lock, you'll have to try those at your own risk. basically it keeps the govlock locked up past 30mph, 

Edited November 29, 2019 by flyingfool

[SierraHD17]

Or since you are in there delete the G80 from the equation with something else.