Chrysler Repair: transmission slips into limp mode, chrysler cirrus, snail mail

Question
I bought a 95 chrysler cirrus about 2 months ago - unfortunately "as is" with no kind of warranty. It had 83,000 miles and the car test drove great. On the way home the car jerked into 2nd gear and would not come out of it. I turned the car off and on again and finally it shifted. In the next few days the dash would go out - all the gauges were dead then it would come back on. The car repeatedly went into 2nd gear. I took it to a friend/mechanic and he checked the codes on the transmission and also found that the car had a new transmission. I have replaced the input and output speed sensors - which did nothing, selenoid module pack - the car was fine for about 400 miles then went back into 2nd, dash cluster - which fixed the dash problem but after about 400 miles the car would jerk back into limp mode, and last the transmission control module - again the car would shift for about 400 - 500 miles. Now the car will drive fine then slip into a sort of nuetral gear and then into 2nd.Only after turning the car off and on again will it finally shift for a few miles then slips back into 2nd. I have spent about $975.00 in repairs and we are both baffled. I even ran a carfax report and found out the car had been serviced at a transmission place in April 05. I called them and they said they rebuilt the transmission and told the previous owner it was an electrical problem. Any idea what  else I could check?  

Answer
Hi Krissy,
Has your friend/mechanic run the fault code readout lately? If not that should be done, and be certain that the reader really is able to get the trans codes. I believe there may be a separate plug for the trans readout from that of the engine controller readout. Only if you can't get any trans codes would I turn to some other approach. Tracing the wiring between the trans controller and the engine controller and the trans itself would then by my next inclination. I have the wiring diagrams for the '96 Cirrus and could copy and snail mail those to you. So that is how I'd approach it.
The fault code is a key factor in repairing these systems. Let me know what code(s) come out.

Roland