Tow haul and overdrive
Does tow haul lock out overdrive? Mine doesn't seem to or, I haven't observed correctly.
Forum Discussion
gmc6000 wrote:
No, tow/haul does not lock out overdrive on any GM or Ram truck, at least. Tow/haul only changes your shift points on the transmission.
I guess it depends on what one means by "overdrive" but I recently bought a 6-spd 2012 Silverado 1500 to replace our 2005 4-spd Avalanche for towing and in Drive when I engage Tow/Haul it absolutely does lock out 6th gear. If I disengage Tow/Haul while towing at highway speed and happen across a relatively flat section of road only then will the transmission upshift to 6th, otherwise with Tow/Haul engaged the highest it will go is 5th, which as it turns out is right where it needs to be - 2000 rpm in 5th, downshifting occasionally to 4th as road conditions may require.
