Trans. questions?

[flightmedic]

I had my trans. rebuilt last year by what I thought was a reputable shop. Now with less than 7000 miles it is shifting hard and behaving badly. I still have a warranty for the trans. and I am sure it will be in again before it's up. But, my questions is I found another local shop for another trans. I am having done and got to talking with the owner. He said that the 518 came with either a loc-up or non-loc converter, even for 93? I have been under the impression that there was not a loc-up offered. Also when I asked him about converting to a 47re he said that it would be a hassle if I went with anything later than a '95, as the 47 was a hydraulic loc-up till then, not necessitating a trigger for the loc-up feature. Any thoughts out there on this? I really feel that converting is the way to go when the time comes. He seems to think that he can build my 518 to a higher level than a 47, even without the loc-up converter.