o/d switch/ tc lock up - Ford Powerstroke Diesel Forum
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Old 07-14-2013, 05:37 PM
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o/d switch/ tc lock up

new power stroke owner. couple tranny questions/concerns. First off its a 99 7.3 and a auto. 4r100.
The o/d off switch doesn't work. push it, nothing happens and no lights come on. tranny shifts normal under any condition.
Second, (and new to these trucks so it may be nothing) but under normal acceleration this things seems to drop into overdrive real quick. at or just below 40mph and once its in there you got to really hammer that throttle to get it to kick down. is that normal on these trucks?
If I accelerate real hard it seems like its running through ALL the gears normal. Shifts real good no matter how I drive it, just seems like it drops into overdrive too quick unless I really hammer on it and once its in overdrive man you almost have to hold it wide open to get it to kick down.
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Old 07-14-2013, 05:51 PM
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oh ya, and is it normal for this thing to decelerate so hard? if its going faster then 45mph and I let off the throttle it coasts for a second then kicks down like a engine brake and decelerates pretty hard. I've just purchased the truck and it has around 240k on it. The tranny was rebuilt around 180k. Is this all normal operation for this truck or should I investigate more?
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Old 07-14-2013, 09:32 PM
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Seams Perty normal to me! I'd cheak the wires to the od switch


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Old 07-14-2013, 10:01 PM
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Absolutely normal transmission wise. I suspect your o/d button is out or the wiring to it at least. These 4r100's really, really hang on to the gear unless you hit a steep grade, or smack down on the throttle for a bit. It at least tries to accelerate before it drops the gear down.
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Old 07-15-2013, 05:22 AM
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Thanks guys, I appreciate the feed back. I'll just drive her then. I started another thread in engine trouble about engine clatter. Check it out if you have time. I would really appreciate feed back on that since I know there is something wrong there.
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