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Discussion Starter #1
Im working on a 1991 E350 van thats been through 3 different shops and no one has fixed the problem yet. It started off as the trans shifting out of od at speed and not going back into od until you shut off the engine and everything cooled down(sounds like wiring issues). The van went to a trans shop who promptly pulled the trans and rebuilt it. Gave it back to the customer and the same problem. Then the trans shop swapped in 2 more transmissions, pcm, and 2 different transmission solenoid packs and it still had the same problem. That transmission shop rolled it to another trans shop. That shop disconnected all of the electronics from the van and said they hooked up some sort of diagnostic tool that they use and the trans checks out. But that shop doesnt deal with wiring. So now I have it.
Now it has even more issues. The od light is constantly on(not flashing) and cannot be turned off. When you shift it into drive it feels like its starting off in 3rd or 4th. When you shift it into 1st it takes off just fine. I checked voltage from the neutral safety switch to the pcm and the pcm is getting signal that the trans is in drive but Im not getting any voltage from the pcm to the shift solenoids. I told the owner that I can continue chasing down wiring and fix the problem as well as run new overlays for the harness or I could just wire in an aftermarket controller like a USShift/Baunum controller and it would eliminate the pcm issues as well as the harness issues(27 year old wiring).
So my question is-are these aftermarket stand alone controllers worth my time and if not then does anyone have an idea why the od light is constantly on and thew trans not taking off in 1st gear while in D?
Thank you
 

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I have the us shift quick 4 and it is not just plug and play I have been tweaking on mine for 6 months getting it to act like I want it to. my 1-2 shift is still harsh on light throttle. if I had stuck with the quick 1 I had originally it might have been better because the quick 4 is a learning controller it learned some bad habits from the stock programming before I changed it. So I am getting happy with it now. My main reason for using the controller was my truck was manual and I needed automatic for my knee. The other problem is the pcm will be trying to control a transmission it is not hooked to and can cause drivability problems with the motor cause its not getting a response from the transmission. my pcm does not care cause it thinks there is a manual trans in it. You maybe trading one problem for another by using a stand alone controller unless u change the pcm to a manual pcm or reflashing it manual.

"Y'all have a wonderful"
"My name is Bob the guy floating in the lake with no arms and no legs"
TSGT Bob W Martin USAF 1948-2014
 

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Wait is this a idi powered van ?
If so get a stand alone and be done with it .
The oem transmission module is ok but when they fail good luck finding a replacement. As well as all the issues you are currently dealing with . Seems to me like too many fingers in the pot and you’re stuck holding the bag . Anyway . I think you’ll be better off with a stand alone .


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