E40D (no engine told) wiring is not the same on all.
it is fully electronic controls.
the PRNDL is odd , it has resistor bank there that allows 1 wire
aka gear selector switch range switch TRS ,P/N , but is PRNDL.
to trans to let TCM know what gear you want.
TCM is >>> , EEG
2 shift solenoids. 2 for clutch, and pressure control too.
The EEG , sets main line pressure in the box. if this fails , it can shift harshly.
does autoshift al gears? or not.
never read Haynes/chiltion rags,. I use them for door stops
then take 10- years of cars and mix all that up in to a toxic soup of waste. avoid it like the plague. it is, use real shop manuals from
ford only or only line here.
https://eautorepair.net/Marketing/Default.asp
testing the range switch is first.
PRNDL , it is prime inputs.
if wrong all fails.
harsh shifting , can be the transmission accumulator bad.
a kind shift shock absorber it is.
or the EPCS bad, the TCM modulates this to use the correct line pressure for every gear, in fact all these PRNDL
is reverse harsh or PRND shift to driver harsh?
the service manual by ford, for E40D , covers all line pressure test to prove EPCS is messing up.
EPC solenoid, electronic pressure controls
not sure will check
Think about this reasoning...
It works just fine. Until it warms up to running temperature!
It could be a control part on the transmission.
Such as, (could be related to proper connections to such parts) "TR Sensor (Transmission Range Sensor) on the transmission near the sifter side.
If it shifts fine when cold, then goes into limp-mode (2nd gear; 1st & Reverse manually selectable) when it reaches running temperature. Then, another factor should be considered, it may be a controller circuit that a/some connector/s may expand as they warm up, thus losing proper connectivity? This will cause such a symptom as discribed.
If transmission has recently been rebuilt, connectors have been removed, possibly not reinstalled correctly? Possibly a locking tab on a connector has broken? If not replaced, connector may lose proper contact with mating connector & become intermitting. ??
Check all wiring connectors for proper seating.
Check continuity between them for their contact verification.
Take these out of the equation.
Secondly, did they replaced or reused parts from old transmission, like TR Sensor and a like??
Check these out first before assuming it an internal transmission problem.
Checking these out first will be much easier then the forgoing, at best...dropping the tranny out, again!)
Wish you success!
Glenn
Reference from:
Ford 1995 Econoline Powertrain, Drivetrain Service Manual
-Section 07-01A: Transmission, Automatic, E40D
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