My son was heading to the Connect festival in the '95 cube van in my sig. He had a late start because we had to replace the high pressure power steering line. Wow, vans are a challenge to work on! Anyway he finally left at about 7:30 PM. At 9:30 I get a call. "Dad, the transmission went." The first good hill they came to, when the transmission went to downshift, it went BANG and dropped into 3rd gear. The OD light was flashing and the transmission was now making a whining noise. I told him it was in limp mode and he should limp back home. I figured I would get the code from it in the morning. After helping him transfer all the stuff from the cube van to the U-haul van he rented, I connected my OBD2 reader. It could not connect to the PCM. Oddly, the OD light was no longer flashing either, but the transmission was still whining when I started it. The fluid level looks OK on the transmission. This is the second transmission that has failed on this van. My son is working towards his Bachelor's from the School of Hard Knocks. I'm working on my Master's. I was wondering if the PhDs could help me out? I thought all '95+ vehicles had OBD2? Were the E350 cube vans exempt? Can I put the PCM from my '97 F250 in the cube van to read the codes? Any thoughts on what to look for? Test to perform? Speculation on what the problem might be? I'm not an automatic transmission guy. I can remove and replace them, and I have rebuilt a couple of Mopar A999s years ago, but really I am clueless when it comes to how the E4OD works. Thanks in advance.