iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
It's my experience that the truck won't jump into overdrive or higher gears so quickly when towing. That means your truck's engine will rev at higher rpms where some of the higher torque and horsepower limits are found in most motors. It also means lower miles per gallon. Here's an answer from howstuffworks.com...
"The tow/haul mode changes a vehicle's transmission shift patterns. Pulling a heavy load requires a lot of power. The tow/haul mode reduces shift cycles. Depending on the truck, it may also boost torque and engage an engine braking mode to help drivers maintain control while driving up and down hills."
In my truck the shift points change and grade braking is way more sensitive. It also downshifts when slowing. 2015 silverado 2500hd with the gas engine.
Tow/haul mode extends the RPM in each gear.....shifts to next higher gear at higher RPM so more work is done in each gear
Should downshift when you apply service brakes
I always have tow/haul ON when towing
I sometimes turn tow/haul on when not towing......depends on traffic flow. Stop and Go and Slower moving traffic so transmission doesn't upshift/down shift---stays in one gear
And with a 4 speed auto (3 speed with Overdrive) it stays out of OD
__________________ I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
As stated above , and typically raises the control pressure to firm up shifts. This allows less slippage on shifts , which in turn helps with fluid temp and wear on tranny soft parts.
On the 90's model Chevrolet trucks if you towed in overdrive without the tow haul mode engaged the transmission life would be shortened dramatically. Newer models it affects grade braking engagement and shift points.
Linear Mode
