4r100 question.

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Mar 12, 2011 | 11:46 PM

powerstrokeforever

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Joined: Dec 2007

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4r100 question.

I have an 02 F350 with a 7.3 diesel and 4r100. I want to know if there is a way I can keep the trans from shifting out of OD when I get into the throttle? This engine has enough torque to keep it in od longer and get better fuel economy. Low rpm shifting really helps fuel economy. Wish I could do it in all gears ; )

Mar 13, 2011 | 05:51 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,698

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From: SE Florida

You need a custom tune to do that. The shifting is controlled by the PCM, so changing the PCM's program is how you modify when it shifts.

Mar 13, 2011 | 11:48 AM

BillyBob69

Lead Driver

Joined: Jul 2003

Posts: 7,404

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From: Wheatland, Mo

What Mark said. Or you can take it to a GOOD tranny shop and see if they will change it for you. OR.... (always onther opinion), you can send your PCM in to someone like DP-Tuner and they will reprogram your PCM for you.