4R100 Issue
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3rd Gear
Joined: Aug 2006
Posts: 3
Likes: 3
4R100 Issue
So I helped my nephew rebuild his 4R100 transmission out of a 2000 F250 with 7.3 Liter. He has no 3rd or 4th gear. 1st, 2nd, and reverse all work. pulled the pan and noticed the 2-3 valve was stuck open. pulled it out and cleaned it and the valve body. Reinstalled the valve and pan and still no shift from 2nd to 3rd. Any ideas where to start looking? First time to rebuild Automatic transmission. We rebuild tractor transmissions and clutch packs but this is a little more advanced. Thanks in advance for any suggestions.
Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
To start you'd want to verify that the PCM is calling for a 3 or 4 shift, if so verify that you are getting the signal at the shift solenoid connector if you are getting the signal at the shift solenoid connector you can disconnect the shift solenoid wire harness and drive it to see if it shifts, I don't remember how it shifts without the PCM running it, but that can help rule out a bad shift solenoid or valves. It doesn't shift normally, but if it does it's default shift it can help point toward the shift solenoid.
I fought the same issue on a reman transmission, ended up being a bad shift solenoid. Not the easiest thing to troubleshoot.
I ordered another shift solenoid pigtail to ohm the solenoid in the transmission which helped
Attached some ford trouble shooting on your symptoms. They didn't help me much, but it's a start.
I fought the same issue on a reman transmission, ended up being a bad shift solenoid. Not the easiest thing to troubleshoot.
I ordered another shift solenoid pigtail to ohm the solenoid in the transmission which helped
Attached some ford trouble shooting on your symptoms. They didn't help me much, but it's a start.
Thread Starter
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3rd Gear
Joined: Aug 2006
Posts: 3
Likes: 3
Ended up being bad 2-3 shift valve. After we pulled the pan and valve body back off, the second time, the valve was stuck again. replaced with new valve and everything works as it should. Kintla, thanks for your help and response with this issue.
Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
Likes: 87
From: North Carolina, Raleigh
Im having a weird issue on 3-4 shift. most of the time it shifts fine sometime 2-3 times a day or so, when running around town, when it shift to 4th it seem like the valve is hangin or whatever does the shift, hangs open or not closed quick as normal, for a second longer sounding like a slip. but for the most part when it does shift when pulling trailer there is NO slip in tq at all according to torque app reading on TQ Slip.
TQ was replace lke 2 yrs ago with issues from a bent line when installed.. it is a sam wyse stage 1 with triple disk TQ.. replacing the OEM in july 2020.. don't think it TQ more something in the valve body ? i changed fluid some 25K miles ago with mercon V a couple times now and fluid looks and smells like new.. could it be VB sticking, lazy etc.?? it can do it under moderate acceleration and light.
TQ was replace lke 2 yrs ago with issues from a bent line when installed.. it is a sam wyse stage 1 with triple disk TQ.. replacing the OEM in july 2020.. don't think it TQ more something in the valve body ? i changed fluid some 25K miles ago with mercon V a couple times now and fluid looks and smells like new.. could it be VB sticking, lazy etc.?? it can do it under moderate acceleration and light.
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Lead Driver
Joined: Jul 2017
Posts: 6,846
Likes: 2,326
From: WV
Carl it sounds VB related.
The torque converter is a fluid coupling with a lockup clutch to make it a mechanical coupling at times. Slipping or delay during shifts should not be TC related.
The torque converter is a fluid coupling with a lockup clutch to make it a mechanical coupling at times. Slipping or delay during shifts should not be TC related.
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Tuned
Joined: May 2021
Posts: 363
Likes: 121
From: Montana
Im having a weird issue on 3-4 shift. most of the time it shifts fine sometime 2-3 times a day or so, when running around town, when it shift to 4th it seem like the valve is hangin or whatever does the shift, hangs open or not closed quick as normal, for a second longer sounding like a slip. but for the most part when it does shift when pulling trailer there is NO slip in tq at all according to torque app reading on TQ Slip.
TQ was replace lke 2 yrs ago with issues from a bent line when installed.. it is a sam wyse stage 1 with triple disk TQ.. replacing the OEM in july 2020.. don't think it TQ more something in the valve body ? i changed fluid some 25K miles ago with mercon V a couple times now and fluid looks and smells like new.. could it be VB sticking, lazy etc.?? it can do it under moderate acceleration and light.
TQ was replace lke 2 yrs ago with issues from a bent line when installed.. it is a sam wyse stage 1 with triple disk TQ.. replacing the OEM in july 2020.. don't think it TQ more something in the valve body ? i changed fluid some 25K miles ago with mercon V a couple times now and fluid looks and smells like new.. could it be VB sticking, lazy etc.?? it can do it under moderate acceleration and light.
I have a tugger shift kit and a HD TC, they work better when pulling a load. Running around unloaded with a tune can be unpleasant with hard shifts and weird TC lock up that feels like a slipping 3/4 shift.
Fleet Mechanic
Joined: Nov 2005
Posts: 1,508
Likes: 87
From: North Carolina, Raleigh
yeah thinking VB thing.. I have a John Woods i got of old trans when the took it off to put the SW one in.. We are not at home till oct .. figured it was VB more than TQ as when i does lock up TQ it LOCK UP tq.. thanks..
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