Re: Overdrive or not when towing
If your truck has the 4R100 trans,then the only reason to tow in 3rd instead of OD would be for a really heavy load where the truck was downshifting constantly. The 4R100 has a clutch for OD.
The 4R70W OD is the function of a band,and under heavy load with alot of downshifting/upshifting-it won't last long. If you're travelling with this trans on long straight flat roadways,then go for it,but when it gets loaded up from wind,etc..and tends to downshift alot-lock out OD.
Either one is safe to town with in OD,just be sure that the trans isn't upshifting/downshifting alot due to load.
4.6L Non-PI/4R70W auto
5.4L 4V/4R100 auto
Stock for now