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?

[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?

[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?

[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, 

[SierraHD17]

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