Freshly Rebuilt 4R100 shift problem... - Ford Powerstroke Diesel Forum
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Old 06-17-2013, 05:38 AM
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Freshly Rebuilt 4R100 shift problem...

Hey all, just got my transmission (4R100) completely rebuilt professionally along with a new TC, by a friend of ours who works at a transmission repair shop. I put the transmission back in last night, filled it full of fluid while it was running, as well as threw in a quart of lucas... I have all my gears P,R,N,D,2,1... but for some reason when the truck is in drive it will not shift out of 2nd.. into 3rd that is... gets to about 2,200 - 2,300 range at about 35 mph and will not shift. Now, if I really get on it, it will act like its going to shift to 3rd but just put itself back into 2nd... I really don't think he messed up rebuilding the transmission considering we've taken about 4 to him and never had a problem but I suppose anythings possible... We're thinking it might be a sensor of some sort? Still waiting to hear back from him, but in the mean time I'd see if anyone on here had some ideas...

Thanks a lot!

Last edited by MDrumm03; 06-17-2013 at 05:46 AM.
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Old 06-17-2013, 07:44 AM
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Is the "OD" light blinking? You can have it scanned for codes. Some trans codes wont set lights but if it doesnt shift then I would think it would. Is it starting in 1st?
It could be what is called "limp in mode" because something isnt right.
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Old 06-17-2013, 08:27 AM
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There is no OD light blinking nor is the CE light on...(not sure if it would) but the guy who rebuilt it said that he believes it is a stuck 2nd to 3rd valve...
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Old 06-17-2013, 08:31 AM
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He would be the nest to have look at it. I dont remember if the elec solenoids control a shift valve or if they themselves are the valves. Make sure your elec connections are all together and correctly.
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Old 06-17-2013, 08:49 AM
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I'll bet you lunch it's a valve body problem.

If you didn't put in an upgraded kit that replaces the solenoid and valves - It probably a stuck valve in the body.

Here's a great video that will cover that.

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Old 06-17-2013, 08:56 AM
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Good info Pat
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Old 06-20-2013, 08:15 AM
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Just curious MDrumm03, any updates?
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