This is not really an answer to your question.
I've never heard of the company inquired about but I can offer lots of praise for Standard Transmission and Gear in Fort Worth, TX, a TDR advertiser. They overhauled the NVG-5600 on my '01 Ram at about 302k miles. They are honest and do great quality work. If you have to travel or ship the transmission to a rebuilder I can assure you that Standard is worth the trip or ship.
Standard disclaimer applies.