Take a look at the Silverado Specifications Page. With the 6.0L gas engine you can have either 3.73 or 4.10. The 3.73's give you a 16,000# GCWR and the 4.10's give you an 18,500# GCWR.
I'm sure the 3.73's will be adequate, but I agree with others that you should find one with 4.10's. Sooner or later the 5er bug may hit you and at that point you'll need that little bit extra performance provided by the lower gear ratio.
Go with 4.10 for sure. I drove a new 6.0 when I was looking last summer. It had the 3.73 and would not hold 6th gear into a light MT wind at 70 mph. When you put your foot down and the Rs came up it would scoot though.
Definitely get the 4.10. Thats what I got, and its nice to have with the 4 speed auto. I'm sure the situation is better in the 6 speed auto, but I'd still want it. The mileage difference is hardly noticeable, but the towing power (with my 4 speed at least) is noticeable.
Im with most the others here, with an 8000 pound trailer, I think you'll be happier with the 4.10's. Have your dealer do a search and see if theres one at another dealership they can get for you. Might find one you like and it will save you the month or two its going to take if you order one.
04 Dodge 1 ton dually, Cummins, auto, quad cab, 4x4, SLT, Sport, Reese Titan V
04 Lance 1161, TV/DVD, high efficiency A/C, Honda EU2000
I pulled a TT about that weight with a 98 with 3.73's. it did alright but when I got my 02 with 4.10's it towed even better. AND I love the locking rear end. I don't think I would go to 3.73 again unless it was tied in with a diesel.
If you do a search on the specific's of the 6-spd Hydramatic you will find that the 3.73 when paired to the 6.0l gas is nearly equal to the previous generation GM HD with the 6.0l & 4-spd Hydramatic in terms of final ratio's. One observation is the comments so far - It's really tough to compare a previous generation GM HD and the 3.73 to the current 3.73 ratio - it's a entirely different transmission with a extra gear and it's own unique layout!
I wouldn't let it be a deal breaker - I wanted the 4.10 but this is my daily driver. I like the fact that the RPM's on the highway are nice and low on the 3.73 giving a quiet cabin at highway speeds. I can't afford another separate vehicle to commute around in, so this is the best compromise on gas, noise and towing.
So after a little research and reviewing the spec's I decided on a 3.73 - ordering would have lost me some GM to dealer hidden cash back that gave me a killer deal on this 08', it was unavailable on ordered units.
So if you can order one and there is no price difference then get the 4.10 - if like me you can get a killer deal on a 3.73 on the lot then get that one.
Michael 2 DD's and my DW 6 Acre's of Maine 2009 Crossroads Cruiser CF31SB 2008 Chevy 2500HD Ext. Cab LT 4X4 Champion lil' yellow Chinese genset, 4000W Camping Pictures
Not sure where the 4 sp and final ratios are equal to the 6 spd......the 4 spd fist gear in trans is a 2.48 and a .71 final. The 2 spd final DOD is a .61, and first IIRC is about 4-1, throw in the TC, and you are in the 7-1 effective range vs 5-1 effective for te 4l80E! Way more down low. The 4 sp would need to have a 4.56 or lower AR to equal the new 6 sp take off overall ratio!
With that in mind, teh 6.0 does like to rev. A 3.73 will net you a bit better mileage empty at 70, but towing at 60, the 4.10 would be the better options! if one can find one! The 3.73/6 sp setup will still have a lower overall low, and a taller final than either the 4 sp 3.73 or 4.10 setups!
marty
05 Chev CC D/A LS Dooley
92 Navistar dump truck, 7.3L 7 sp, 4.33 gears with a Detroit no spin
00 Chev C2500, V5700, 4L80E, 4.10, base truck, no options!
92 Red-e-haul 12K equipment trailer
3 Single axle utility trailers
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