I have read and read about this issue trying to figure it out. My 94 bronco has had some shifting concerns now for about a month....it started with harsh 1st to 2nd and 2nd to 3rd. It would only do this every now and then pulled the codes and got 452 cleared the code and continued to drive to see if it came back. Over the next week or so it drove great then all of a sudden it started shifting hard again only this time it would go into a neutral state when it shifted into 3rd gear. Here is what I have done.....drain fluid and change filter, new vss (it is aftermarket and reads 1800 ohms bought one from the dealer it also read in the 1800 ohms), mlp sensor, psom, checked every fuse. Did a ac voltage test at the pcm pin 3 and 6 just the other day. From 0 to 50mph the highest reading was 12 and from what the book says it should be no more or less than 4 anything over 4 volts replace pcm. So my question is has anyone else made this 250-400 dollar decision and it fixed the problem. Also while hooked to the scanner ran data and whached the vehicle speed as soon as it jumped to neutral I lost all speed data on the scanner. But if I am driving down a hill and it jumps to neutral as I cost faster my speedometer reads faster. Any help would be nice THANKS!!!!