I wish I could help you Chuck. I've never run into that problem before. The only "variable" solenoids I know of are for the torque converter clutch and electronic pressure control. The 95-97 trucks had an on/off TCC solenoid while the Super Duty trucks had a pulse width modulated TCC apply solenoid. I wasn't aware of any differences in the EPC solenoid valve.
I would assume if the difference is due to the TCC solenoid, then you would want the one that IS NOT variable.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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