Does the 4R100 Pump in Park? - Ford Powerstroke Diesel Forum
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Old 03-14-2013, 09:11 AM
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Does the 4R100 Pump in Park?

Hi Guys,
I've had a few E4OD's in F150's and Bronco's before and thankfully they've been good to me. I was younger and didn't really do a bunch of looking into the trans before I moved on.

My question is, with my 2002 4R100 does it pump fluid in park? Is there any gears where fluid is not pumped - Neutral/Reverse? I've searched and seem to be finding some conflicting information.

Reason I ask, I use the truck to primarily tow my 27' Fifth Wheel and to Plow snow in the winter. I had a Ram V10 that I knew did not pump while in Park, so anytime it idled I left it in Neutral with the ebrake on to allow it to cool down.

My plans are to run a Derale Pan and a Hayden Tranny cooler with electric fan as well. Thanks in advance!
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Old 03-14-2013, 09:46 AM
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It pumps in P and R and 1-4, not sure/never check N but I feel certain it does. At least my 02 did.
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Old 03-14-2013, 09:35 PM
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It must pump in park and neutral as both those gears hold the #1 clutch pack. Anytime the engine is running the pump is running.
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Old 03-19-2013, 03:55 PM
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Good to know thank you both!
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Old 04-11-2013, 04:20 PM
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There are no clutch packs applied in neutral or park. And , yes, the pump is pumping if the eng is running, unless the pressure regulator valve is stuck open. But then, you couldn't drive it any where.
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