Differential carriers

[COKE]

I have both axles from a 79´Jimmy.
The front one is a 10 bolts and the rear is 12 bolts.
They are 3.42 ratio and i want to convert them to 4.10.
Will the 4,10 ring fit in the carrier or will i need to get another one?

Thanks

 

[80' 427]

It looks like your are fine on both just besure to NOT order the thick gear for the 12 bolt. Should add a locker while you are there.

 

[COKE]

Hi,
Sorry i don,t understand,what is the thick gear?
Do you mean that there is two types of gears for the 12 bolts?

The 12 bolts i have does have locker,it cames with it from factory,i belive it is an Eaton ...Could be?

Thanks

 

[80' 427]

Your carrier for the 3.73 is below the numerial split. So yours will handle a 3.73, 4.10, 4.56. Now if you had a 3.40 or higher you would need a thick gear cause the carrier is different. Some people also use a spacer. You don't need a spacer or a thick gear.

 

[Hogback Fabrication]

Hi,
Sorry i don,t understand,what is the thick gear?
Do you mean that there is two types of gears for the 12 bolts?

There are two different carriers with two different offsets on the 12 bolt. The aftermarket manufacturers make "thick" gears so you can fit low gears (numerically higher) on the carrier that generally holds the higher gears (numerically lower).

The carrier split on a 12 bolt is 3.73/3.90 which means that you will want to buy "thick" gears for your rear axle since you are switching from 3.42 gears to 4.10.

There is no carrier split on your front 10 bolt, any 4.10 gears you buy for it will work.

You should also realize that changing gear ratios is not a simple remove and replace operation, there is a writeup on what it takes here.

The 12 bolts i have does have locker,it cames with it from factory,i belive it is an Eaton ...Could be?

Thanks

Its not really a locker like most of us talk about, but it is a factory traction aid. Its called a gov-lok, option code G80 and it doesn't have a very good reputation for strength but can be a good traction aid for a truck with stock sized tires.

 

[COKE]

Each one of you are saying to me diferent things but since my gears are 3.42 and not 3.73 i suppouse that 38377k5 is right and i should to buy the "Thick" gears.

About the G80, i do not use the truck for crawling,just for tow and light 4x4 purpouses,so i suppouse that it will be enough.
(Since the axle are for replace my existing 10 bolts and it is out of the truck,I still don,t know if it works ok)

Thanks a lot for the help

 

[80' 427]

He is right some how I read 3.73 not 3.42s. I am tarded sorry.

 

[80' 427]

Each one of you are saying to me diferent things but since my gears are 3.42 and not 3.73 i suppouse that 38377k5 is right and i should to buy the "Thick" gears.

About the G80, i do not use the truck for crawling,just for tow and light 4x4 purpouses,so i suppouse that it will be enough.
(Since the axle are for replace my existing 10 bolts and it is out of the truck,I still don,t know if it works ok)

Thanks a lot for the help

I will just repeat what I have been told over and over if your replacing your axles you should do a 3/4 ton swap. More than likely be 4.10s already.

 

[4X4HIGH]

Each one of you are saying to me diferent things but since my gears are 3.42 and not 3.73 i suppouse that 38377k5 is right and i should to buy the "Thick" gears.

Now let me confuse everyone with saying that 38377k5 is also wrong on the carrier split. There are 3 different carriers for a 12 bolt chevy, they are 2.73-down, 3.07-3.42, and also 3.73-4.56. Regardless if you don't want to buy a carrier you need to buy thick gears.

The 10 bolt actually has 2 different carriers but for all intensive purposes unless you have the really odd 2.56 ratio which uses it's own carrier the other carrier fits 2.73-5.57.

 

[Hogback Fabrication]

Now let me confuse everyone with saying that 38377k5 is also wrong on the carrier split. There are 3 different carriers for a 12 bolt chevy, they are 2.73-down, 3.07-3.42, and also 3.73-4.56. Regardless if you don't want to buy a carrier you need to buy thick gears.

The 10 bolt actually has 2 different carriers but for all intensive purposes unless you have the really odd 2.56 ratio which uses it's own carrier the other carrier fits 2.73-5.57.

Do you have any reference for this? Everything I can find says that the 3 series carrier is 3.08-3.73 and the 4 series carrier is 3.90-6.14.

I didn't mention the super high ratio carriers because they're rare and sucky, but its probably a good point to mention that they are out there

 

[4X4HIGH]

I took this info from my Drivetrain Warehouse book. I can scan it in if need be.

 

[Hogback Fabrication]

I took this info from my Drivetrain Warehouse book. I can scan it in if need be.

I believe you, its just that your info is contrary to what I can find. Maybe the car and truck carrier breaks are different (I know that the ring and pinions are different).

Anyway, none of this is really relevant to the original post. If you're switching from 3.42's to 4.10's with 10/12 bolts axles, you'll need regular 4.10's in the front and thick 4.10's in the back.

 

[4X4HIGH]

I believe you, its just that your info is contrary to what I can find. Maybe the car and truck carrier breaks are different (I know that the ring and pinions are different).

Anyway, none of this is really relevant to the original post. If you're switching from 3.42's to 4.10's with 10/12 bolts axles, you'll need regular 4.10's in the front and thick 4.10's in the back.

I'm fairly certain that the car carrier break is different than the trucks. I do know that the carriers are different between car and truck.

 

[80' 427]

The cars have 2 brakes the trucks only one. Richmond lists the break at 3.73 and higher.

 

[4X4HIGH]

The cars have 2 brakes the trucks only one. Richmond lists the break at 3.73 and higher.

Like i said earlier, trucks have 3 carrier breaks and cars have 2. Trucks are 2.73 and down, 3.07-3.42, and 3.73-4.56

Cars are 3.90 and down and 4.10 and up.

 

[80' 427]

sorry should have quoted you.