Join Date: Oct 2012
Location: In the midwest (I travel a lot so it varies between South Dakota and Nebraska and the midwest)
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Umm....VSS sensor? Since you mentioned your speedo being erradic, this is where I would look. Yes, this sensor is also a pretty important one for your tranny so make sure it's good at your rearend. It sends a lot of signals to different components such as a PCM and etc..
Originally, I was going to mention the neutral safety switch that is usually found on the gear selector of the transmission. Sorry I can't remember the formal name of them now but they basically take the information of what gear they are in (manually from the transmission) and send an electronic signal to the PCM and so on. So, when these go bad and again, start sending erradic signals to various components (the trans), then weird things happen. But usually, it will send codes to your O/D switch. I had a Windstar that would lose 3rd and 4th due to this switch being out. Once I would change the switch, everything would be good. They just sometimes go bad. I don't know why.
I am with Backwoods also and the other person that mentioned the 3rd brake light (good call). Stupid things like that that can just make you scratch your head.
Also, since you're plugging and unplugging your big connector repeatedly, I would take a mirror and check out the pins in the trans and make sure they're good and also check out the connector pins to make sure they're good as well. Maybe there's a reason that by you repeatedly unplugging this connector and replugging it in it fixes your issue for a short time. I don't know. Then, I would recommend some dielectric grease in the connector to aid with conductivity and keeping out moisture and so on.
Outside of that, I would hate to say that it sounds like the inevitable is starting to happen. And I don't need to tell you what that is. I'm crossing my fingers for ya.
Went to school in 94-95 for automotive. Ford Tech till 2000. Got out of the biz for a bit and then did it for a year at an independent shop. Now own my own business as a professional singer & entertainer & provide full event production from event setup & decor to lighting, sound, video & much more. Don't claim to "know-it-all" when it comes to vehicles and always love to discuss things to get a different point of view. Hopefully you can see past my direct nature and understand mine.