GM Tow haul use - opinions

JIMNLIN wrote:

falconbrother wrote:
We picked up our travel trailer today at CW. They set up the weight distributing hitch for us and gave us a lot of instructions on how the accoutrements in the camper work. One thing the guy said that I need some opinions on though..

The TV is a 1500 Suburban 4x4 and the trailer dry weight is about 5500 pounds. I asked him about using the tow haul feature and he said he wasn't sure that he would recommend it. He said out on the open interstate he would recommend leaving it off and never, ever use it with the cruise control on. He said: "It will rip your transmission out". I haven't used it very much at all. The Suburban pulls the trailer just fine either way.

What's your experience with using tow haul while actually towing a trailer?

I'll repost your question as it has a different tranny that the tow/haul works different than all the Dmax owners/Ford and Dodge owners auto trannies.

The 4l60e....6l80e tow/haul mode we have in our 1500 GM trucks just hold the TC clutch unlocked up to a higher rpm or so before locking up or a upshift. Nothing at all like the Allison in the Dmax or a Ford or Dodge tranny in 3/4 and one ton trucks..

I don't/didn't use TH mode in a 4l60e or the 6l80e in the wifes new 1500 chevy truck. The biggest reason is no engine braking with the TC clutch unlocked in 2nd/3rd gears.
Not using TH mode lets the TC clutch lock up normally for good down hill braking in those lower gears.

IMO T/H mode in these two GM auto trannies is for folks that don't know how or understand the need for proper rpm for towing.
Anyways...try T/H mode fore a couple of trips and then try it without TH mode on.

Thanks. I have the 4L60e transmission with tow package (cooler). I suspect that I will use the TH and leave the cruise control off and see how that goes. I do notice that the burb spends a lot of time in 3rd gear when in TH whether towing or not.