Which Axle 9.75 or 9.5

[Antoine08]

I have a 6.2L with 3.42 gears. Do I have the 9.75 axle (because I have a 6.2L) or do I have the 9.5 axle?

Hope it's not a stupid question, looked around didn't find a clear answer. If there is a topic about this can someone post a link.

Edited November 15, 2014 by txab
edit title

[thetruck454]

Unless you have the NHT tax trailering package, you have the 9.5" axle.

[Antoine08]

Unless you have the NHT tax trailering package, you have the 9.5" axle.

 

 

Are you sure? Because i thought that until i seen this (picture below), and thats not the only add I've seen say that.

 

[thetruck454]

That graphic is odd, I was just going by the ordering guides

 

http://www.gmfleetorderguide.com/NASApp/domestic/proddesc.jsp?year=2015&regionID=1&divisionID=1&type=0&vehicleID=16823&section=oi_def&page=6&butID=3

[Antoine08]

I went through the website you posted. But it didn't really say anything about the size the 6.2L came with, just the ratio

 

 

Source

http://media.gmc.com/media/us/en/gmc/vehicles/sierra/2015.html

Quote

A high-capacity 9.76-inch axle is matched with 6.2L-equipped models and is part of the available Max Trailering Package.

 

 

Source

http://www.fourwheeler.com/vehicle-reviews/129-1304-the-general-has-spoken-gms-latest-trucks/

Quote

Trucks equipped with the 6.2L V-8 are fitted with a new 9.76-inch rear axle.

 

Not trying to say your wrong just wanted some hard facts because I didn't think that my 3.42 ratio had the 9.76" but everything I have been reading tells me different

Edited November 10, 2014 by Antoine08

[thetruck454]

I wonder if there is an RPO code to check in the glove box that would tell either way. I fear it will just tell you NHT or not, which doesn't solve the discrepancy we are having.

[peejaykay]

I bet axle ratings are the same. Wish nht gave us higher rawr and at least 7600 gvwr, in addition to the cooling upgrades.

[Vanished]

I was also told ALL 6.2's had the larger rear to handle the power...

 

 

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[Antoine08]

I would call the dealership but we all know I could get the most off the wall answer. So I'm hoping to get someone who actually knows, because I would like to move up to 3.73 or 4.10 gears and that obviously plays a big part.

 

Does anyone have the part number and price for GM 3.73 ring and pinion gear.

[Antoine08]

On GMDirect website right now there differently is a 3.42 with 9.76" axle assembly. I'm starting to think the 6.2L do have the 9.76"

[thetruck454]

One thing that struck me odd is if you look at chevy.com or gmc.com and compare the same cab configuration 5.3 to 6.2 the weight is different. I'm not sure if this is due to more std equipment or that may indicated the 6.2 comes with the bigger 9.76 axle. Engine vs engine there shouldn't be any difference in weight as they are both all aluminum and physically the same size.

[Antoine08]

Hey guys i answered my own question. To all you 6.2L owners it is said by GMDirect that we have the larger 9.75" Axle. so if you have the 3.42 gears, the GM 3.73 can be a direct replacement. Part numbers are in the picture.

 

Looks like i will be upgrading to 3.73 gears soon, i know many of you think thats not a big enough swap but to me thats all i want.

 

[thetruck454]

Thank you for putting in the effort and getting this clarified

[Vanished]

Thanks - curious why you would want to spend $2k on going from 3:42 to 3:73? Lift/tired? Towing? I'm very happy with my 3:42's...

 

 

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[Antoine08]

It will cost less than 1k. I love my 6.2L but i can't leave things alone i put a 2" leveling kit and 33" tires didn't really affect performance to much, but would like to get a little extra power. I will do the maintenance myself with a few buddies so only paying for parts and beer.

Edited November 12, 2014 by Antoine08