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I have decided to purchase the 2500HD gas. I have test driven it with the 3.73 rear end and it drove nice. I will be pulling my Classic 25 2006 with a gross weight of 8300lbs. This time of year its difficult finding a 4.10 rear end which I am convinced I want. The only way to get one is to order it. Since I have never driven one with the 4.10 rear end I am concerned bike tours maui that maybe I won't like the shift pattern.
I have decided to purchase the 2500HD gas. I have test driven it with the 3.73 rear end and it drove nice. I will be pulling my Classic 25 2006 with a gross weight of 8300lbs. This time of year its difficult finding a 4.10 rear end which I am convinced I want. The only way to get one is to order it. Since I have never driven one with the 4.10 rear end I am concerned that maybe I won't like the shift pattern.
Pappy while it's been some time since I bought my 2500 van, I did specify the 6 liter 4.10 rear axle combo. My heavy slide out performs well with the combo. My previous vehicle was a 5.7 liter 1500 van with a 3.73 rear axle and pulled a 6500 lb. Safari so I really can't do much on the comparison side. I use the tow/haul mode when I tow and find the shifting of the trailer is very smooth. The towing package added an external transmission bike tours maui cooler.
GM allows towing in OD with the combo and I pull it down a gear to hold speed on some hills here in Missouri. Shifting is very smooth and the only other thing that is interesting is that due to the axle, mileage while not towing is only a couple of MPG better than when towing. When towing bike tours maui I usually average 11-12 mpg.
I have a 2000 Yukon XL (K2500 AKA 3/4 Ton 4X4) with the Vortec 6000 4L80E transmission and 4.10 axle ratio. I love the truck and plan to keep it for a number of years to come. I ordered it new and I've had relatively few problems. The truck tows my 1991 34 foot Limited with no problems at all.
Don't think of the 3.73 versus the 4.10 as affecting the shift points. The shift points are set up in the powertrain control module on vehicles of my vintage and a transmission control module on newer vehicles. The shift points are set up the same (normal and tow/haul modes) regardless of the rear axle ratio. If you divide 4.10 by 3.73, you get 1.099. This translates to a 10 percent gain in rear axle torque and the engine RPM for a given speed is 10 percent higher too. However, the fuel mileage bike tours maui may be about the same because less throttle is required for a given amount of torque output.
However, IMO, with the 6 speed and your weight, I would get the 3.73. I have driven that combo last summer with my 30'er, and was quite pleased. 4.10 would be fine, but the mileage penalty is not worth it IMO.
I have a Sequoia with a 4.10 rear end with a 6 speed and the mileage difference and don't really believe is there. My friends have the 8.2 liter suburban with a 3.73. I do better down hill and better gas millage. Will mines not a 8.2 liter either. I would go with the 4.10 it's better torque and better pulling up and down hill.
Pappy lives in Indiana, not Colorado. Unless bike tours maui he plans a lot of mountain stuff, a 4.10 isn't needed. If he had a 34'er, I'd have a different position. With a 25'er, a 4.10 and with a 6.0 is wasteful. It'll cost 1 - 2mpg running solo (10 - 15%) and about the same percentage towing.
I'm changing my recommendation. bike tours maui I didn't realize that the 6L90E was the standard transmission in the 2500 HD (see Powertrain Products bike tours maui ). That trannie is rated for 550 pounds feet of torque and a gross combination weight rating of 21,000 (i.e. tow vehicle, towed vehicle, and all cargo, etc.). This transmission can be run in second, third, fourth or fifth in the hills/mountains, as required. So I'd definitely go with the 3.73:1 and just run it in a lower gear when needed. Also, I believe that the 2500 HD has a full floating rear axle, so it's even more heavy duty in design than my truck with a semi-floating rear axle. As an aside, this is one of the finest light truck transmissions on the market today...right up there with the Allisons, but of a newer design.
I know that this thread isn't dealing with towing technique, but I'll throw out some information here for any who are interested. The most efficient (economical) RPM range for towing is from about 800 to 1,200 RPMs below the torque peak up to the torque peak for a normally aspirated gasoline engine. This is also the RPM range when the engine is under a significant load that produces minimum wear and oil consumption. bike tours maui On the Vortec 6000 that's being considered here, the torque peak is 4,200 RPMs (see Powertrain bike tours maui Products ) so the most efficient RPM range when towing will be from about 3,000 up to 4,200 when you're pulling like a 4% grade or steeper. On level ground, 2,500 or so would be fine.
I have always used very low ratio axles for towing mostly to improve the shift points and keep the engine in its torque range. I went with 4.30 gears in my f150 and it was the best mod I made for towing. However my experience with this the new 6-speed in my 2011 F250 has caused me to rethink things completely.
The transmission control software is very sophisticated and specifically designed for towing. bike tours maui With the trailer plugged in, it adapts the shift pattern based on the incline (up or down), road speed, throttle bike tours maui position, brake pressure, and engine response (load sensing). And...it all works just as smartly on cruise control with the Airstream in tow.
I was planning bike tours maui to have the dealer swap in 4:10 Ford gears after buying the F250 new. With 6 speeds, a big fat torque curve, and engine/tranny software that always picks the right gear at the right time, I happily cancelled that mod.
If you do go with 4.10, I would not worry about gas mileage. In my experience swapping to lower gears, gas mileage improves slightly bike tours maui towing and is about the same not towing if I avoid the urge to indulge in the faster takeoffs
Well, hate to rain on your parade, but towing my 30'er with toys in the bed (about 15,700 GCW) I saw 8.5 - 9.5 MPG on a regular basis. A couple of times, I saw near 10. You MAY hit 10 more regularly with a 25'er, but I still say you won't with a 4.10. But, get what makes you happy. That's what really matters.
it when considering just the weight limitations. Thats only 900 more pounds than what I have now. Now maybe the engineers are being conservative bike tours maui but I have to go by the placard. So if I load the airstream and the truck the way I want to that leaves me with only 400 lbs to the good. Not exactly the margin I was looking for. The salesman told me that if I order now I won't get it until the first week in October. Seems
My 2007 AWD Denali is a 6.2 all aluminum block 386HP 403FP torque with the tow selection option and 6 speed, it greatly changes the shift points and affects engine braking, sounds odd but I actually get better mileage towing a 1960 24'
Though I have towed about a ton less than you with both 3.73 and 4.10, and transmissions have changed quite a bit since 1996 and 2004, I will say that 3.73s will do the job, 4.10 will be nicer to the tranny. I hear a number of folks say that 4.10s will eat gas like there is no tomorrow and I caravaned with folks that had a similar size and weight Airstream, towing with the GMC version of my 2004 Suburban 2500 (6.0L). We filled up, we went the same distance...their truck with 3.73s and mine with 4.10s. The MPG difference was undetectable.
I don't think in GM land you can get 4.10s with diesel, but if I found a gasser that had 4.10s I would grab that. Sweet spot on mine is about 2000 rpm, which is about 60-62mpg and according to the DIC, I get about 11 to 12 mpg towing. Had a good tail wind last trip and got upward of 15mpg!
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