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I guess my next move would be to replace the speed sensors just to rule it out. If that doesn't make a difference I'll look into an aftermarket TCM and harness. I'll keep you guys posted.

The only code it ever threw was 73 with the original TCM. That code is for the PCS (pressure control solenoid) circuit. Thats what led me to replace all of the internal solenoids and internal transmission harness. When that did not fix the issue, I found the troubleshooting manual online and...

The tcm is not throwing any codes when using the modus.

Is this something a transmission shop would have? Or is that something the modus can do? Remember the only way I can read the tcm is through the obd1 port I wired up. I would imagine I can't do the normal things a modus could do with just that setup..

Initially the TCM gave me code 73 when I put it in diagnostic mode by jumping A and E on the 6 pin plug. Now, it does not throw any codes. I suspect that's because the TCM was unplugged.

I would definitely buy another TCM from ebay if I could find one cheap. The cheapest I've found are $600-$1000.

This is the adapter I made to go from the 6pin cannon plug on the tcm housing to an OBD1 port.

No codes present when using the modus and the live data makes no sense. I'll post a pic of some of the readings.

I received and reinstalled my original TCM today. The trans light flashes like it used to, it connects to the modus scanner/displays live data and enters diagnostic mode when I jump pins A and E. The "remanufactured" TCM from module experts would not do any of the above. I swapped the eproms...

Ok, thank you. That answers my question. I just talked to a technician at module experts. They are going to send my original TCM back so I can swap eprom's but like you said it probably won't make a difference. But at least I will have all the original equipment back for the truck and I can...

Thanks for the input guys. Aftermarket has definitely crossed my mind through this whole mess. I'd just hate to deviate from the factory setup. One thing I noticed is the new TCM has eprom BKUL installed. From what I can tell that's for a 95-99 4l80e HD w/ 6.5l. The original eprom was a CZSU...

Unfortunately I did not get my old TCM back. I Have a call in to them and am waiting for a call back. Just to clarify, I replaced the solenoids and internal wiring harness after the transmission issue went from intermittent limp mode to limp mode all the time. It threw diag code 73 (PCS...

This is what module experts sent me

This is the original TCM

Gentlemen, I've been fighting an issue with my 1999 m1123 for months now. The 4l80e had an intermittent issue where it would randomly go into limp mode. That was usually remedied by a simple off/on key cycle and it was back to normal. That has since progresses into the truck will not come out...