Upgraded My Truck

CWSWine wrote:
I do have a couple of questions, guess it really kinda late since the truck will be here Monday or Tuesday.

1. This truck has the Z71 option, will that have any affect on towing?

2. The truck also comes with 20 inches tires, is that a positive or negative affect on towing.

3. I was told "By a Salesman" that we don't need to use trailer mode since our trailer is less than 70 percent of the gross towable weight of the truck and not using it will increase our fuel mileage. The only time that I would want to use it would be in the mountains to take advantage of the exhaust breaking. Is this true?

1. All that adds are some stickers and a skid plate over the Tcase I believe. Nothing real special like they want you to think.

2. I think you mean the 20" rims, which will have no impact on towing. Not sure of the overall tire size, but I think it should be close to 32", so you have a slightly smaller sidewall. As long as you are under what each tire is rated for, you will be fine.

3. Since when should you ever believe a salesman? Tow haul in these trucks are great. Do you need it? NO, but I would use it. It adjust line pressure in the trans to help keep it cooler, which in a LML is already pretty cool thanks to half the line pressure as previous years, and it also changes shift points to allow better engine braking and control speed on grades. What I do a lot of the time is use it until I am at cruising speed on the highway. Although usually by putting it in 5th gear at 65 MPH I will see better mileage, lower EGTs, and lower Trans Temps. Tow Haul really comes in handy on grades. Set cruise, make sure the Exhaust Brake is on, and watch it do its thing. You should be within a few MPH of your set speed going down grades without use of the brakes. Pretty cool stuff.

Check out Duramaxfourm.com for some great info.