One problem related to transmission gear slipping has been reported for the 1999 Dodge Ram 3500. The most recently reported issues are listed below.
Transmission slipping fm dt of purchase. Requested trans. Inspection Aug 3,2000, dealer did. Sept 27 2000, trans failure, dealer rebuilt. Nov 3,2000, less than 2000 miles after rebuild, check engine light came on. Took to dealer,their diagnosis was inconclusive. Nov. 27 2000,trans failure , trans replaced for second time. Jan 2001, took truck to dealer,transmission slipping, failing to reach next gear, took to dealer, they found nothing wrong,Feb 2001 (current) vibration, plan to take back to dealer. For 5th time.