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46rh troubleshooting a rushed 2-3 shift on fresh rebuild.
'93 D250
I've rebuilt the trans with:
-5 pinion planetary and corresponding intermediate shaft,
-new steels+ clutches
-billet apply lever and servos ECT.
-TFOD-Hd2 valve body
-tighter Goerend converter.
Truck is in OD by 35mph. Rushes the 2-3 shift and won't hold second gear when "2" is selected. Going from "2" to "D" engages the OD. 1-2 shift feels good. Holds first gear pretty well depending on were I put the TV cable. Sometimes downshifts after I've come to a stop making me think I have a mushroomed governor valve. So I've done some pressure readings.
I’m getting the following pressures
-----------------------------Front Servo-----Rear Servo--------Acum. Port
Throttle valve--------------Front---Rear----Front----Rear----Front----Rear
Manual 1st gear-----------0---------0--------75-------110------75--------110
Manual 2nd gear----------0---------0---------0---------0--------75---------105
Drive-----------------------90--------125-----0---------0---------90--------125
Reverse -------------------20--------20---------------------------------------------
Neutral---------------------75--------75---------------------------------------------
The gov pressure is running about 1.7-1.9 x the MPH or about 60 psi @ 30mph with the throttle valve off (front) didn’t test it with it forward. This is double what the FSM recommends but maybe the transgo kit changes that?
Before I drop the pan and change out what is probably a sticking mushroomed gov piston (thanks to Guitar Jones from the moparts.org for that tip) I was hoping I might narrow down some other possible problems. Like I said earlier, it is rushing 2nd gear and going to 3rd real quick and doesn’t like downshifting. Shifts are pretty soft also. I didn’t drill out the shift hardness hole much on the transgo kit to help ease the shock loads on the driveline, but I didn’t think it would be this soft.
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