4r100 shudder between 2-3 shift
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Cross-Country
Joined: Mar 2018
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4r100 shudder between 2-3 shift
02 f250 2wd 4r100. 143k miles. Transmission shifts kind of weird particularly during the 2-3 shift. Described best as a shudder or like a fast double bump. Only under light-mild throttle. WOT it shifts absolutely perfect. It doesn't do this a lot but enough once in a blue moon For me to take notice. It actually shifts decently most of the time. Noticed this at 136k and serviced the fluid and filter with Motorcraft parts and fluid (mercon v). There was the usual fuzz on the magnet but also some black pepper like flakes in the pan. The shifting did improve but every once in a while it will do the shudder thing. 1-2 is fine. 3-4 and lock up are perfect. Just the 2-3 shift. Temps are fine. There wasn't a bobber In the pan so I assume it's at least been serviced before. What is a general consensus on this?
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Cross-Country
Joined: Mar 2018
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1-2 flawless
2 bump bump 3rd
3-4 flawless
4th to lock up flawless.
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Cross-Country
Joined: Mar 2018
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Yeah i realized that i had it backwards after you said something lol. Long night.
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Cross-Country
Joined: Mar 2018
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I've been reading through multiple threads anywhere I could find but nothing seems close to my specific issue. Is it possible that I have trash around the 2-3 shift valve, the associated accumulater, or the direct drive clutch?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
Not the shift valve, but possibly the accumulator. If it were the shift valve the shift wouldn't happen.
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Cross-Country
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ideally I want to replace a potential accumulator or something I can get to from dropping the pan if it's infact the issue. I hate throwing parts to solve problems.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
My 4R100 doesn't do that. Neither has any of the many other 4R100s I've driven over the years.
If a trans I'm driving doesn't shift right you can bet that I will notice it. It was my job for many years at Ford to rate shifts. I still can't stop doing that even though I left Ford almost 15 years ago.
If a trans I'm driving doesn't shift right you can bet that I will notice it. It was my job for many years at Ford to rate shifts. I still can't stop doing that even though I left Ford almost 15 years ago.
Tuned
Joined: Jul 2007
Posts: 338
Likes: 1
From: Barbourville Ky
First im not a believer of a fix in a can,,
But I had basically the same issue with my 4r100 in a truck I owned a few years ago.
Long story short I added a bottle lucas transmission additive to it and problem went away.
Drove the truck a few more months and sold it but Trans was.working fine when I sold it
But I had basically the same issue with my 4r100 in a truck I owned a few years ago.
Long story short I added a bottle lucas transmission additive to it and problem went away.
Drove the truck a few more months and sold it but Trans was.working fine when I sold it
New User
Joined: Dec 2021
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No shift, no movement. 4R100
So I just got my truck back from the dealership the other day. I hook up my plow and start plowing my driveway. Through out the time of plowing my truck started loosing power to the wheels. I eventually had the throttle to the floor and my trans was starting to get hot but not overly hot. I had some smoke I could see in the light from my head lights. Any ways I let the trans cool off and went back out later on. I got maybe 1/4 to 1/2 a mile when my truck no longer would move at all in any gear, not 2wd, 4wd high nor 4wd low.
well last night I went back out and tried to see if it might move with a cold transmission. I got 6 inches of movement in reverse 2wd. All other gears and ranges just free rev.
well last night I went back out and tried to see if it might move with a cold transmission. I got 6 inches of movement in reverse 2wd. All other gears and ranges just free rev.
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Cross-Country
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Little update for everyone and anyone who may come to this savior of the forum.
A seemingly unrelated thing I believe solved my problem. My intake has been leaking coolant for a past few months at the crossover on the passenger side. Well I was driving it the other day and noticed that my exhaust note sounded off. Not a definite miss but for sure something was off. Remembering threads about that same issue with the intake causing the #1 plug well to fill with coolant, I pulled the coil and low and behold there was moisture on the contact in the coil, inside the boot and on the plug. Replaced the plug with an ngk I had in my stash, a new boot and spring and a coil off my gt mustang. It always idled good, infact better than my 09 f150 does. Always decent power. But doing that instantly made it even better.
and above all the shifts are buttery smooth now. I can't even feel it shift gears now. That's about 2 days of driving it and paying attention to it closely after R&I of the COP and plug.
Will update with any further developments. This forum has saved me much trouble. I'd like to help out future readers if I can.
A seemingly unrelated thing I believe solved my problem. My intake has been leaking coolant for a past few months at the crossover on the passenger side. Well I was driving it the other day and noticed that my exhaust note sounded off. Not a definite miss but for sure something was off. Remembering threads about that same issue with the intake causing the #1 plug well to fill with coolant, I pulled the coil and low and behold there was moisture on the contact in the coil, inside the boot and on the plug. Replaced the plug with an ngk I had in my stash, a new boot and spring and a coil off my gt mustang. It always idled good, infact better than my 09 f150 does. Always decent power. But doing that instantly made it even better.
and above all the shifts are buttery smooth now. I can't even feel it shift gears now. That's about 2 days of driving it and paying attention to it closely after R&I of the COP and plug.
Will update with any further developments. This forum has saved me much trouble. I'd like to help out future readers if I can.
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