help!! cant figure this one out. Tranny f150 question please.
filed in 1994 Ford F150
Question: We have exactly the same problem with one of our Ford vans at work. It won’t > come out of first gear (automatic, of course). You have to turn it off and > restart it and all is well. Ford can’t figure it out.Good luck. > jor
> “Markus”
> > Okay, here is the problem. Several weeks ago, while on my way home I took > > an off ramp from a major interstate. After stopping at the top of the > ramp > > and making my turn, my truck, a 1994 Ford F150 w/302 engine and 4 wheel > > drive, would not shift out of low gear. I immediately stopped and checked > > fluids, crawled underneath and checked for any leaks, damage, broken > > hardware etc. Nothing. So I babied it all the way home(2 blocks) never > > breaking th3 5 mph barrier.
> > The next morning I took it to a transmission shop. It worked beautifully > on > > the way there. No problems whatsoever. I told the shop what happened and > > that I didnt have a problem that morning but still wanted to get it > checked > > out…cuz I take very good care of my truck. After all, thats my baby. > Two > > days later, after hooking up scanners, sensors, error code readers etc > they > > could not find anything at all wrong with it and they even called for > > permission to take it on a long drive to try to get it to act up…to > which > > it didnt.
> > They said to keep driving it and as soon as it does it again come in there > > immediately and they will hook up the scanner on the spot. It did it > again > > a week and a half later. Drove right to the shop but no error codes at > all. > > grrr.
> > It has happened several times and every time I take it into the tranny > shop, > > they hook it up and nothing. Can anyone help me with WHAT THE CRANK IT > > COULD BE???? I am losing my mind. It will act up and the next morning it > > will be fine. Could this be a simple sensor or something???
> > I sure would appreciate any advice you can offer.
> > Markusdownsouth 
Answer: check the wiring from the speed sensor on the rear differential
it has a connector right at the sensor, and probably another one about 2-3 feet up the wire on the frame rail
take ‘em apart and look for corrosion, clean it if it’s there
also pull GENTLY on the wires, sometime it will corrode almost in two INSIDE the insulation with no outward signs
also you might want to take the sensor out of the diff and check for metal particles clinging to it…….be careful, the bolt is prone to corrodong and seizing up and it you twist it off you are screwed, blued, tatto-ed and shove in a barrel, as they say
soak it down with PB Blaster the night before
another thing that causes this, with no codes, is the MLPS (Manual Lever Position Switch), located surrounding the shift lever on the outside of the transmission, giving the ECM a false indication what gear it’s in……if the MLPS tells the ECM the lever is in ‘1′, it won’t shift (a good indication that this is the problem is that you have engine braking, when you let off the gas, where you normally wouldn’t)
every time the weather turns rainy for 3-4 days, I get Tauruses, Sables, and Windstars that are shuttle shifting 4-3-4-3-4 caused by moisture in the MLPS
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