4r100 wouldent shift 2nd full throttle - Ford Powerstroke Diesel Forum
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Old 09-07-2013, 05:50 PM
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4r100 wouldent shift 2nd full throttle

Went to race a dodge the other day, it was really hot outside. Left the line around 10psi launch and got a jump on the dodge but when it came time to shift to 2nd the truck seemed like it went to neutral I let off the throttle and it shifted.

Could it be from the heat? Trans temps were at 155*. I bought the truck used and the owner before said it has a beefed up trans with a billit converter.
Can this be the valve body, or sound internal?
I got on the truck in the morning today and it shifted fine.
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Old 09-07-2013, 06:09 PM
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155 degrees isnt hot for the trans
mine does this occasionally i think its the torque converter not unlocking, but i could be wrong.
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Old 09-07-2013, 06:33 PM
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Sounds like the tq converter. But could just be worn parts in the trans. Mine did that before I built it.

Sent from AutoGuide.com App
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Old 09-08-2013, 06:53 AM
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I don't have the extra cash for a trans right now, have a 5month old baby. I guess I'll have to take it easy on the truck and drive normal!
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Old 09-10-2013, 05:21 PM
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Mine did that. Then I pushed it too hard and blew it. I know the center support being loose can cause this (or so I was told [i also had slipping in 3rd and 4th when floored for a good 5 miles or so]).

So you might be able to retorque the center support and it might help.
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Old 09-10-2013, 05:38 PM
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Is the center support where the back trans mount is? Ill go check make sure all is tight.
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Old 09-10-2013, 05:39 PM
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no, the center support is inside the case. mine was broken too, when I got mine built they found it.
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Old 09-14-2013, 06:18 PM
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Checked the code today it it had the typical p1211, p478, and a new code that came on is p720.
Can that 720 speed sensor code cause this issue with shifting out of first? I'm going to order a new ford trans filter to replace before I drop the pan to check the center support bolts.
Also it shifts really soft, think if I had my ts chip sent out if they firmed up the shifts it would get it into gear?
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Old 09-15-2013, 12:41 PM
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Took off and cleaned the sensors, same problem...
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Old 09-18-2013, 02:22 PM
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Did you do any work to the valve body recent?
How many miles are on the trans.

but if you're not getting the 2-3 upshift, might look at this video (sadly with bad audio) for the 4r100 rebuild.
Could have been a stuck valve.
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