RepairPal Certified shops can diagnose and repair your 1999 Dodge Ram 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Transmission has a governor of sorts......it is sticking... try flush and fill, w/filter.
also, check vacuum lines under truck, that are ON TOP of Tranny body. they tend to work loose, if in harsh weather.