Join Date: Mar 2011
Location: Langley, BC
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Tow/haul merely bumps the pressures and modifies the shift points. it doesn't lock out gears at all.
The type of terrain you are driving, and the size of your load is going to be the biggest factors. Tow/haul can suck in town, (shifts can be harsh, but it is less slippage between gears, thus generating less heat and less wear on internal components) but on the highway, it works rather well. The downshifts maybe early, but better to be in the powerband rather than powering out. the biggest factor in deciding in between driving in D and driving in S-whatever, will be what gear you can reasonably hold, without alot of shifting. as smart as these trannies are, they will still hunt. Hunting makes for jerky ride/poor fuel economy and its hard on the tranny, both in heat and wear and tear.
I run S4, and yes i may sacrifice .5-1 mpg vs running in s5, but there is much less strain on the engine and transmission for the terrain i am driving in, and i'll easily make up the extra couple dollars in fuel in repair costs by babying my truck.
07 Limited 5.7L 2WD DCRB - billet grille, folding rear seat backs, LED frame strip lamps, BAmuffler, Painted TRD rims, AMP research Bed step
2016 Forest River Surveyor 226RBDS
Tundra Campers Club #35
Last edited by Ditchhooker; 05-15-2011 at 02:56 AM.