Took it to the shop again this morning to let the guy that did the rebuild take it for a test drive. There is good news and bad news
Bad news: they cant reproduce the symptoms I described and they are sticking to there guns that dexron is perfectly fine for the transmission and will not cause any problems.
Good news: the shop is willing to flush it out and put ATF4 along with a new torque converter and not charge me again for labor.
Bad news: the torque converter I wish to purchase cost about 500 dollars and atf4 plus filter will cost me 50 so when all is said and done I will be into this tranny for right around 2000 dollars.
Im wishing now I would have taken it to the place that quoted me 2,500 but they included a new external cooler a new oem style TC and mopar fluid and filter and a 1 year 10,000 mile warranty.
Any advice on purchasing a TC? the one I want is from Hughes Performance the 16LXTM XTM Torque converters, GM torque converters and Street Rod Converters