2014 Part # for 3.73 Rear and Front Assembly

CTHM732 · September 29, 2016

Good Afternoon,

I'm looking for someone here that has a 2014 Sierra or Silverado 6.2 that has the 3.73 gear ratio (4x4) and would be willing to share their VIN so I can get the exact OEM numbers. I called GM performance and they told me it's easier to find someone who has it and run their VIN to get the numbers. I'm looking for the part numbers (Whole axle assembly and Front Dif) to do a swap without messing with the internals of my current assembly. Any help is appreciated. Thank you.

newdude · September 29, 2016

But will it be cheaper to re-gear than spend $6100 on axles? That is how much the front and rear go for combined...before tax...

Any particular reason you are wanting to swap? 2016 with the 6.2/8 speed, I assume you are either 3.23 or 3.42 gears now...

amxguy1970 · September 30, 2016

But will it be cheaper to re-gear than spend $6100 on axles? That is how much the front and rear go for combined...before tax...

Any particular reason you are wanting to swap? 2016 with the 6.2/8 speed, I assume you are either 3.23 or 3.42 gears now...

I am going to guess either future bro lift on big tires or ego. The gear spreads between the 8 are very tight, gears aren't making near the difference they did back in the day when the transmission ratios were so far apart. Curious to hear the answer myself, that is an expensive change with somewhat minimal return.

Tyler

CTHM732 · September 30, 2016

But will it be cheaper to re-gear than spend $6100 on axles? That is how much the front and rear go for combined...before tax...

Any particular reason you are wanting to swap? 2016 with the 6.2/8 speed, I assume you are either 3.23 or 3.42 gears now...

Labor alone for the front and rear will run at least 1600.00 just to re gear. Parts will likely run about the same as master kits will be needed for front and rear. Front differential and rear for a 5.3 3.73 with a 9.76 is about 2800 at many GM parts websites. Add in the fact that I might not exhaust my remaining warranty by using OEM, it seems worth just getting the assemblies. As far as my gear ratio, it's a 3.23. Not happy with it.

CTHM732 · September 30, 2016

I am going to guess either future bro lift on big tires or ego. The gear spreads between the 8 are very tight, gears aren't making near the difference they did back in the day when the transmission ratios were so far apart. Curious to hear the answer myself, that is an expensive change with somewhat minimal return.

Tyler

Neither. Don't have big tires and 3.73 is far from being labeled as a tool to feed any ego. It's a great median ratio.

GM has changed their purchase packages when it comes to gear ratio. You used to be able to purchase a Z71with a 3.73 ratio, I owned one. Now, they only offer it in max tow package. The acceleration and take off is simply better with the ratio. Other than perceived MPG gains, why GM makes 3.08 and 3.23 ratio's is questionable.

redwngr · September 30, 2016

Labor alone for the front and rear will run at least 1600.00 just to re gear. Parts will likely run about the same as master kits will be needed for front and rear. Front differential and rear for a 5.3 3.73 with a 9.76 is about 2800 at many GM parts websites. Add in the fact that I might not exhaust my remaining warranty by using OEM, it seems worth just getting the assemblies. As far as my gear ratio, it's a 3.23. Not happy with it.

The 3.42 that is available with the max tow package on your 2016 6.2 / 8 speed will give the same overall ratios as the 3.73's with a 2014 6.2 / 6 speed.

newdude · September 30, 2016

Labor alone for the front and rear will run at least 1600.00 just to re gear. Parts will likely run about the same as master kits will be needed for front and rear. Front differential and rear for a 5.3 3.73 with a 9.76 is about 2800 at many GM parts websites. Add in the fact that I might not exhaust my remaining warranty by using OEM, it seems worth just getting the assemblies. As far as my gear ratio, it's a 3.23. Not happy with it.

Both of them together is not $2800. That's less than what ANY GM dealer even pays for them from GM. And how much shipping do you think they will hit you for just to save a buck? A $hit ton. GMPartsDirect has the rear for $2907 and the front goes for $1003. That is not $2800, rather $3910. And don't forget shipping.

TJay74 · September 30, 2016

Don't forget also, if you re-gear you will also need to have the correct calibration flashed into your ECM/TCM for the new gear ratio. That part you wont be able to get from GM or any dealer and will have to be done aftermarket. So if you are wanting to go with OEM stuff in order to keep your warranty, then you just killed your project because the aftermarket tune is going to open you up for any drivetrain liability of you have any problems.

CTHM732 · September 30, 2016

Both of them together is not $2800. That's less than what ANY GM dealer even pays for them from GM. And how much shipping do you think they will hit you for just to save a buck? A $hit ton. GMPartsDirect has the rear for $2907 and the front goes for $1003. That is not $2800, rather $3910. And don't forget shipping.

There's with and without limited slip which is significant difference in price and either can be used from what I've been told by my local GM maintenance center. I don't need full front assembly just the differential. Add in the fact that I don't touch the internals of my current assemblies I can sell them and get some back.

The only issue as stated is the computer. 3.73's may not work with my 8 speed as has been pointed out. I may realize that the 3.42 will suffice and provide what I'm looking to accomplish and likely will have the code to run and calibrate the computer. Problem is the 3.42's in a 6.2 are scarce and finding one to see if the juice is worth the squeeze may take some time.

Donstar · September 30, 2016

- see if the juice is worth the squeeze may take some time.

Exactly what I was thinking! Also, I respect your reasons for wanting to switch and I'm sure you've considered the pros and cons of re-gearing or trading in your truck. I definitely believe you can get the parts without using someone else's VIN and think it would be a mistake for someone to give it to you. Good luck with your plans. I have a 4.3 6spd. and my acceleration and take-off meets my needs nicely!

Crooks · September 30, 2016

Neither. Don't have big tires and 3.73 is far from being labeled as a tool to feed any ego. It's a great median ratio.

GM has changed their purchase packages when it comes to gear ratio. You used to be able to purchase a Z71with a 3.73 ratio, I owned one. Now, they only offer it in max tow package. The acceleration and take off is simply better with the ratio. Other than perceived MPG gains, why GM makes 3.08 and 3.23 ratio's is questionable.

I would get a tune put on your truck before you spend the money on hard parts like new diffs. Alot of your slow acceleration is throttle management and transmission tune.

07Softail · September 30, 2016

Some folks you just can't reach!

RT

CTHM732 · September 30, 2016

Some folks you just can't reach!

RT

I respectfully asked for solutions and ideas and for the most part those requests have been met. I greatly appreciate those that have fulfilled that request. What I didn't ask nor do I need is condescending and belittling comments from users who have zero intent on providing a solid solution to the situation that I requested help with. If you'd like to share something else that's positive other than what you've posted I'm open to hearing it. Thanks.

1kwik72 · September 30, 2016

Based on my VIN you want part# 23204006 on the rear FYI wholesale cost is about $3200

The front is a little more tricky the VIN filter doesn't knock it down, they want the code off the diff. I crawled under mine but couldn't see the tag. If I get an open hoist here at work I can lift it up and look again. The three possibilities are: Part# 23484384 Usage: (CODE AAAY) : K1 3.73R(GT4),2-SPD MAN SHFT ALUM TRANSFER CASE(NQG),SWITCH ACTIVATED 2-SPD TRANSFER CASE(NQH), Part# 20980291 Usage: (CODE AAAR) : K1 3.73R(GT4),2-SPD MAN SHFT ALUM TRANSFER CASE(NQG),SWITCH ACTIVATED 2-SPD TRANSFER CASE(NQH)

Usage: (CODE AACH) : K1 3.73R(GT4),2-SPD MAN SHFT ALUM TRANSFER CASE(NQG),SWITCH ACTIVATED 2-SPD TRANSFER CASE(NQH)

Part# 23197292 Usage: (CODE BAAL) : K1 3.73R(GT4),2-SPD MAN SHFT ALUM TRANSFER CASE(NQG),SWITCH ACTIVATED 2-SPD TRANSFER CASE(NQH) Wholesale on them is between $1100 and $1200

Craig

Crooks · October 1, 2016

I respectfully asked for solutions and ideas and for the most part those requests have been met. I greatly appreciate those that have fulfilled that request. What I didn't ask nor do I need is condescending and belittling comments from users who have zero intent on providing a solid solution to the situation that I requested help with. If you'd like to share something else that's positive other than what you've posted I'm open to hearing it. Thanks.

Was your last vehicle drive cable throttle body? Or what year was your last vehicle.