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4.10

jason1198

By jason1198
in Engines & Drivetrain

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jason1198 New Member

jason1198

Posted
Posted

Wanting to switch to 4.10s from stock 3.42

Truck is 4wd so doing both front and rear. Wondering what’s needed to do other than ring and pinion gear and what kind of brand is best

Bash74 Enthusiast

Bash74

Posted
Posted

You can contact East Coast Gear Supply. They have been great to deal with. They will let you know what you need without you getting stuff you just don't need.

Sent from my SM-G975U1 using Tapatalk

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Gears and bearings is pretty much it for parts. Wouldn't be a bad idea to get a better rear locker and not use the factory G80 anymore.

 

Yukon gears are also another good place to buy stuff from.

M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted (edited)

Yukon has a 3.73 for the 9.76, anything over that I would go with what bash74 said. Has something to do with fitting gears for the 9.5 into a 9.76. But as long as your rear end isn't a 9.76 you shouldn't have issues finding gears anywhere.

 

 

 

Does anyone make a locker for the 9.76? I looked into it a little while ago but couldn't come up with anything. It would be nice if there was a truetrac that would fit.   

Edited by M1ck3y
truckguy82 Senior Enthusiast

truckguy82

Posted
Posted (edited)
5 hours ago, M1ck3y said:

Yukon has a 3.73 for the 9.76, anything over that I would go with what bash74 said. Has something to do with fitting gears for the 9.5 into a 9.76. But as long as your rear end isn't a 9.76 you shouldn't have issues finding gears anywhere.

 

 

 

Does anyone make a locker for the 9.76? I looked into it a little while ago but couldn't come up with anything. It would be nice if there was a truetrac that would fit.   

9.76? I’m assuming thats the diff for the 6.2?

 

They also had the 6l80, 6.2, 3.73 combo for the 2014 MY only in sierra/silverado

Edited by truckguy82
M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted
14 hours ago, truckguy82 said:

9.76? I’m assuming thats the diff for the 6.2?

 

They also had the 6l80, 6.2, 3.73 combo for the 2014 MY only in sierra/silverado

Yeah 9.76 is for the 6.2 8spd, or 5.3 max tow 2015+. I think the 14's had the 9.5. imo oem is the way to go, but 3.42 is the highest they have for the 9.76.

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted (edited)
39 minutes ago, M1ck3y said:

Yeah 9.76 is for the 6.2 8spd, or 5.3 max tow 2015+. I think the 14's had the 9.5. imo oem is the way to go, but 3.42 is the highest they have for the 9.76.

Nope, just confirmed my 2014 6.2 has a 9.76, its stamped on the diff. Also confirmed with numerous other posts in this forum. From what I understand all 6.2’s are 9.76

 

I have the 3.42. They did offer the 2014 only 6.2 with 3.73 gears with the max tow package.

 

Which should mean in 2014 only, you can get a 9.76” diff with 3.73’s from the factory.

 

unless of course for the 6.2 max tow they actually went to the 9.5” diff. Which would be strange

 

 

Edited by truckguy82
  • Like 1
M1ck3y Senior Enthusiast

M1ck3y

Posted
Posted (edited)
3 hours ago, truckguy82 said:

Nope, just confirmed my 2014 6.2 has a 9.76, its stamped on the diff. Also confirmed with numerous other posts in this forum. From what I understand all 6.2’s are 9.76

 

I have the 3.42. They did offer the 2014 only 6.2 with 3.73 gears with the max tow package.

 

Which should mean in 2014 only, you can get a 9.76” diff with 3.73’s from the factory.

 

unless of course for the 6.2 max tow they actually went to the 9.5” diff. Which would be strange

 

 

I'm really confused now... I don't doubt you, if its on your truck, its on your truck. For some reason I thought you couldn't get 3.73's for the 9.76. Maybe they stopped producing the part? I'll have to look into it

 

Looks like I might be getting some 3.73's, lol.

Edited by M1ck3y
Darksky Enthusiast

Darksky

Posted
Posted

The improvement from 3.23 to 3.73 with tires that measure out just a hair under 35” is very good. The drive-ability improvement is great. I ran the numbers a while ago, with the swap, the truck performs as it would’ve with stock height tires if it had been equipped with a 3.46 ratio. This is just where the math calculations would’ve put the gearing. The truck runs much better- stoplight to stoplight. Any feeling of “lugging” is gone. Mileage picked up a bit for in city driving. Highway performance is back where it should be and the truck sees 8th gear much more often. All in all a great improvement without having to swap the internals down to the 9.5” set up.  

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted
11 minutes ago, M1ck3y said:

I'm really confused now... I don't doubt you, if its on your truck, its on your truck. For some reason I thought you couldn't get 3.73's for the 9.76. Maybe they stopped producing the part? I'll have to look into it

No i have 3.42 and 9.76

 

I don’t have max tow. Max tow should have 3.73 with 9.76 for 2014

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