Transmission leaks when towing.

are you shifting into a lower gear when starting to go up the hill you should use the transmission when doing this no matter how steep the hill is because this will stop the overload on the transmission , maybe time for tune up ,? , do u also have a towing switch in you vechil I do not know what u are towing with , no listed in your question

A) Depends on the hitch you have and what it is rated for. Most car hitches (non truck or SUV) have a tounge weight rating of 500 LBS. This is the weight that is put on the actual connection of car and trailer. B) To not kill your transmission, do not exceed a total trailer weight of more than 1/2 the vehicles curb weight. (Dry weight of car full of fuel) Car transmissions and frames were not originally designed for towing, and exceeding 1500 LBS total trailer weight is considered dangerous (can get trailer weave and sway easily) and will cause excessive strain on drive train components. U-Haul has an online guide that will basically tell what type of trailer you can haul and its maximum allowed weight.

That light means that the shift points have changed on the transmission. This is to get better economy when hauling. If it wont stop flashing then there is a valve in the transmission that is bad or sticking. You will have to have it removed and overhauled..

Th e tow haul button is so if your towing a heavy trailer its easier on the tranny when you hit the button you generally dont need to use it for everyday regular driving.

this truck should be able to handle the task. does the truck have a tow haul/ switch on the drivers area. and you can look in your owners manual for more information

tow mode gives ur transmission a longer shift point to relive strain on engine while driving -it doesnt give it more horse power to start off a hill

Towing and hauling usually means it has some options to make it easier to tow or haul. In this cas it will have a hitch and the plug for teailer lights... It will have a few other extras as well maybe even heavier brakes but no electric brake control or wiring in the fron for it. Sorry...

It saves your transmission from costly repairs. The little bit of fuel you think you may save by not using it, will certainly not outweigh that big bill for new transmission. Saves transmission from shifting up & down too much.

you most likely have overheated the trans. and it has blown the fluid either out of the vent on top or out the dipstick tube its self. most cases just a top off and you should be good... there is also a tsb on re-routing the vent tube so it doesnt clog as easy

Is your truck wired for a 7 pin flat plug? if so are you using an adapter? The adapters are made differently. One has the center pin as brakes and the other uses the center as Aux. power. Any chance of an animal getting to the wires? They are kown to chew on the wiring. Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info.