Is it true that if you’re pulling a load with an automatic transmission equipped car or light truck you should start out in the ‘D’ or drive position, then shift into overdrive ‘OD’ once you reach highway speeds.
No! If your pulling a load, trailer RV, etc, start out by manual shifting into low, then second , then third, then drive. Manual shifting through the gears raises the hydraulic pressures in the transmission which helps out because it makes applications of the bands and the clutches much firmer in the transmission, increasing the life of it. You should leave it in drive unless your on flat level ground and can shift into overdrive without the transmission hunting.