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.

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.

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"

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.

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

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

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.

Same here. Don't want to end up popping a code or run to lean

My Girl

Might be a stupid question but will this cause a big enough difference to effect me passing smog? Seeing as I live in Cali.