true or false,what is the fastest way to fry a auto tranny? leave to o/d off while pulling or leave it on. i have heard from a few to never have o/d on while pulling a load as it over works the tranny. even on a flat surface. my dad pulls a big *** travel trailer from oregon to arizona and cooked the tranny. the shop said it was cause he left it in o/d all the time. is this correct?

 

pretty much

 

what would be the weight specks 2,000lb, 5,000lb. at what load weight does it over work the tranny for useing o/d?