4R100 Transmission Limitations

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Mar 14, 2015 | 08:35 AM

hobbitwho

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4R100 Transmission Limitations

QUESTIONS: Strain from HEAVY weight or Temps tears apart Transmission? Towing in OD= OK and just take it out on climbs? Orange vs Yellow Solenoid? PWM or a TCC On/OFF Valve in the Pump?

1999 Ford F-350, 7.3 Diesel 292,000 miles, towing laden weigh 16,000 lbs. Lose Forward Gears after REVERSING for greater than 50 feet, 30-40 times in 2 months but would return after 15-30 minutes, finally lost Forward Completely. Teardown revealed forward Clutches Burned.
Transmission rebuilt TOWING in mind: Billet Triple Clutch Torque Converter, Transgo Tugger HD-2, High Energy Clutches and New Steels, Drum turned w/ 3 additional clutches, NEW Retaining Ring. UPGRADED Sprague Clutch and Bearing, One Piece bushing, 6 gear Steel Planetary, High Output Pressure Pump (PWM Pump) with larger gears, Shift Solenoids (Mine was Orange, he put a Yellow in and told me it was for Increased Pressure, never heard of before)), New Center Support, Deep Pan, 40K GVW Cooler and Gauges.
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Mar 14, 2015 | 12:53 PM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Temperature is usually the problem. If you tow in OD and it isn't shifting too frequently back to third, you're fine. I don't take it out of OD for climbs, pressing the go pedal down does that for me.

I don't know what orange vs yellow solenoid means.

You want a PWM or on/off to match the hardware in the PCM and the converter.