Tow Haul mode

[ntar827]

Have a Chevy Class C.

Do you normally drive with the tow- haul engaged or not?

Does it help of hurt on downhill grades?

Thanks

Nick

[powderman426]

I can't speak to gmc, but on Ram trucks, the T/H mode is different by year. My friend has an 04 and T/H keeps it from going into overdrive while my 05 is the opposite. I would try to find someone with the same year. JMO

[Not_a_Clue]

I have mine on most of the time, but in Southern Ca we are going up and down hills most of the time.

[dan-nickie]

Only use in in the hills.
It helps keep the speed down while descending.

[the_bear_II]

I use it on hills or if I'm towing something.

It won't hurt the engine/transmission to use the tow haul(T/H) mode all of the time. Basically it keeps the trans from shifting into overdrive. Overdrive provides better gas mileage on mostly level roads.

If you always use it you may use more fuel. Try a couple of test runs with it engaged and calculate your mileage and then try the same route and only use the T/H mode for up or down hills, compare your mileage.