4r100 Hard Shifting (cross post)
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4r100 Hard Shifting (cross post)
I'm posting this here as I'm hoping some may have some more experience in this forum. I have a '99 F250 SD that shifts hard on the 1-2 shift. Below is my post in the V10 forum.
https://www.ford-trucks.com/forums/6...-shifting.html
I did some research and have found that on previous E4OD's the 1-2 accumulator spring had broken and caused similar symptoms. The hard shifting is only on the 1-2 shift above 3200 rpms. Could it indeed be the accumulator spring?
Any other ideas? I'm stuck at this point.
Doug
https://www.ford-trucks.com/forums/6...-shifting.html
I did some research and have found that on previous E4OD's the 1-2 accumulator spring had broken and caused similar symptoms. The hard shifting is only on the 1-2 shift above 3200 rpms. Could it indeed be the accumulator spring?
Any other ideas? I'm stuck at this point.
Doug
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Update: I dropped the pan today. The pan was clean with very little if any material in the bottom. I pulled the valve body and pulled every accumulator, spring, piston, etc. Everything looked good. Nothing was broken. I cleaned everything up and reinstalled it. I then replaced the filter and threw it all back together. I took it for a test drive and everything seemed fine for about the first 25 minutes (about 30 stop/starts). I then felt a harsher 1-2 shift at 3200-3500 rpms. I tried reving it out to 4000 rpms and it didn't seem to shift harshly there.
Questions
1. Could the throttle position sensor (TPS) have anything to do with my problem? The harsh shift seems to only occur in the 3200-3500 rpm range.
2. I also found while I was under the truck that it had the Banks Trans Command installed. I purchased this truck in March and I had no idea. Could a bad trans command cause this issue? I don't have a bypass plug so I can't isolate it from the system.
Any other thoughts?
Doug
Questions
1. Could the throttle position sensor (TPS) have anything to do with my problem? The harsh shift seems to only occur in the 3200-3500 rpm range.
2. I also found while I was under the truck that it had the Banks Trans Command installed. I purchased this truck in March and I had no idea. Could a bad trans command cause this issue? I don't have a bypass plug so I can't isolate it from the system.
Any other thoughts?
Doug
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Originally Posted by tim.moman
Kinda a partial answer to #1. Yes the TPS does affect shift firmness. Specifically pressure settings. Is it part of your problem, much harder to say.
Doug
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Doesn't hurt, but those usually go bad in the just off idle area.
Anyway, I wouldn't expect this to be your trouble. But is is possible.
Interestingly my f150 shifts banged after changing gears cause the shifts were a higher rpm and unloaded. Adding TV pressure made it hit painfully hard.
Typically, Hard shifts like that indicate a fluid control issue. Like a valve hanging, clog, broken spring, filter sucking air, or other part failure. If your trans commander is failing it could cause that behavour since it modifies the TV mapped pressure. Or amplifying a TPS problem
will be interesting to hear what you find.
Anyway, I wouldn't expect this to be your trouble. But is is possible.
Interestingly my f150 shifts banged after changing gears cause the shifts were a higher rpm and unloaded. Adding TV pressure made it hit painfully hard.
Typically, Hard shifts like that indicate a fluid control issue. Like a valve hanging, clog, broken spring, filter sucking air, or other part failure. If your trans commander is failing it could cause that behavour since it modifies the TV mapped pressure. Or amplifying a TPS problem
will be interesting to hear what you find.
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Originally Posted by tim.moman
Doesn't hurt, but those usually go bad in the just off idle area.
Anyway, I wouldn't expect this to be your trouble. But is is possible.
Interestingly my f150 shifts banged after changing gears cause the shifts were a higher rpm and unloaded. Adding TV pressure made it hit painfully hard.
Typically, Hard shifts like that indicate a fluid control issue. Like a valve hanging, clog, broken spring, filter sucking air, or other part failure. If your trans commander is failing it could cause that behavour since it modifies the TV mapped pressure. Or amplifying a TPS problem will be interesting to hear what you find.
Anyway, I wouldn't expect this to be your trouble. But is is possible.
Interestingly my f150 shifts banged after changing gears cause the shifts were a higher rpm and unloaded. Adding TV pressure made it hit painfully hard.
Typically, Hard shifts like that indicate a fluid control issue. Like a valve hanging, clog, broken spring, filter sucking air, or other part failure. If your trans commander is failing it could cause that behavour since it modifies the TV mapped pressure. Or amplifying a TPS problem
will be interesting to hear what you find.Doug
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From: Olathe, KS
Another thought, If the torque convertor is staying locked during shifting it will cause the hard shifts. Mine does that occasionally when it gets confused. But not RPM specific like yours.
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Originally Posted by tim.moman
Another thought, If the torque convertor is staying locked during shifting it will cause the hard shifts. Mine does that occasionally when it gets confused. But not RPM specific like yours.
Doug
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hey there, let me know what you find out.. I am having a very similar issue, My 1-2 shift is hard during normal driving (under 3k rpm shifts) but when i get it above three it is smooth. I was wondering if mine was the TPS since it is hard at lower RPMS for me. Thanks, scott P.S. mines a 04 f250 v-10
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I hope to bypass the Trans Command later this weekend. I have been busy with a bunch of other things that kept me from doing it last weekend. I have driven the truck a good bit though, and I'm honestly wondering if it's supposed to be doing the firm shift on the 1-2. It's not bone shattering, just firm at times. I think the dirty fluid may have been partially to blame. It feels very good since the valve body was cleaned and the fluid/filter was changed. It may have had the firm 1-2 shift above 3k at the time of purchase, but I may have not noticed since I pretty much keep the revs below 2500 rpm in order to conserve gas.
I will get back to everyone shortly.
Doug
I will get back to everyone shortly.
Doug
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Originally Posted by tim.moman
did a littel research, Ford might not lock the TC in 1st. I do not have control of it in my software for 1st anyway.
Doug
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on mine below 3k rpms it is a noticably hard shift. I went by advance auto on my way into work and the TPS sensor was 70 dollars so before i spent that sort of money i wanted to do some more research. Let me know if you find anything out with yours, thanks, scott
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Originally Posted by aristocraft
on mine below 3k rpms it is a noticably hard shift. I went by advance auto on my way into work and the TPS sensor was 70 dollars so before i spent that sort of money i wanted to do some more research. Let me know if you find anything out with yours, thanks, scott
Doug
Edit: Still didn't get a chance to disconnect the Trans Command. It rained on Sunday which was the day I had planned to work on the truck. Grrrr....
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mine is a 2004. neither store had it in stock, and said they had to get a motorcraft part. both were just about 70 dollars... i just went out and took it off and am trying to figure out how to test it now. haha. thanks, scott