I recently bought a 2017 Chevy Silverado CrewCab with the 5.3L Eassisst package which comes with a 8spd transmission and 3.08 rear gear ratio. Does anyone know if there are any issues in changing the gear ratio in this model? I know they don't offer any other gear option from the factory, so does that mean it'* not possible?

I am about to buy a 5th wheel trailer around 9500lbs and i wanted to switch to the 3.73 gears for better towing, even considering buying the whole 9.76 max trailering axle assembly and selling the 3.08 axle if it is possible. Thanks

10k with a 5.3? Does it say in the manual you can tow that much?

2017 Silverado 1500: Pickup Truck | Chevrolet
scroll down that page, or search for the word tow, it says 11.1k

Ok, but because the truck is so new, I would be concerned about warranty. On a different note, you will need to have your ECU and Trans ECU reprogrammed to reflect the new gear ratio. (different shift points now)

I'll wait for others to chime in about the actual part itself.

I wouldn't mess with it. Any gains would be minimal going from a 3.08 to a 3.73. Your 8-speed transmission starts at 4.56:1 first gear then 2.97:1 second gear. Those are plenty deep enough to get things moving. Unless you need to drag race with the trailer and are looking to shave a tenth off of your trap time. That and warranty etc. too. Warning, skip to next paragraph to avoid technical read. My 80'* C30 with 165HP and 230lbft doesn't have too hard of a time getting 10,000 pounds moving. Yes I've got a 4.56 rear end but I've also got a 33" tall tire compared to your 31". My first gear is 2.48:1 so 2.48*4.56*0.95ish for tire disadvantage=10.74336:1 overall starting out compared to your 14.0448:1 overall in your first gear. And you have and additional 190HP and 133lbft to work with.

That'* too heavy, see below . . .

I did, then I clicked the little caveat "cross" sign and it says: Silverado 1500 Double Cab Standard Box 2WD with available 5.3L V8 engine and Max Trailering Package. Before you buy a vehicle or use it for trailering, carefully review the Trailering section of the Owner'* Manual. The weight of passengers, cargo and options or accessories may reduce the amount you can tow.

Not sure if yours is a Double Cab Standard Box 2WD, but I'm pretty sure you don't have the Max Trailering Package. So I looked it up at: http://www.chevrolet.com/content/dam...500-012617.pdf

. . . and you are rated for 9,300 pounds since you have the EcoTec3 5.3L V8 and 8-speed automatic. Based on this you'd start out 200 pounds overloaded then add people and stuff and a big gulp and you are way over.

Ironically if you didn't have the 8-speed automatic you'd be rated for 9,800 pounds. I suspect this is because the 6-speed it tried and true even in moving vans and buses and the like. My suggestion: slightly smaller trailer and a large auxiliary transmission cooler.

Somebody give this guy a parking spot here at the forum.

Thanks Mike!