|
Posts: 5874
| I'm not a GM guy, but is there now a separate OD and Tow/Haul on them? I thought the Tow/Haul mode allowed the tranny to alter the shift points for better towing performance on the GM's much like it does on the F150's. Spent time with a buddy and his 5.3 in a Suburban. He always towed with the O/D off. He didn't have Tow/Haul mode on that one. Maybe it didn't have the towing package?
I have a 2010 F150 with the 5.4L, 6speed, 3.55 gears, and towing package(Tranny and Oil coolers). I pulled my 1890 Tuffy in Tow/Haul mode and used cruise all the time. 2 trips to NW Angle and back and it didn't do a lot of shifting on the highways except up grades. The converter does lock up a good amount of time. I averaged 15 with it on those trips. I ran 55 and 65. Makes a difference in fuel mileage.
My brother has a new F150 with the EcoBoost, same tranny, 3.73 gears. That truck is a towing monster. A LOT of torque, and power. Gets about 14-15 with it towing a 24 foot enclosed trailer, and 18-19 no load. I'd consdier it for my next truck, but in 10 years, they'll have somethiong better yet, I assume.
The previous best towing truck I had was my 83 F150. 300 6cyl, 4 speed OD manual, and 3.55 gears. Put that thing in 3rd on the highway, and that is where it stayed, no matter the load. Only on the steepest grades did I have to downshift. I could not kill that motor. Low oil pressure with egg shaped rod bearings at 200K, I rebuilt it with a mild cam, 390 spreadbore, and headers. Awesome. Surprised a lot of 350 GM owners with that one. | |
|
