Weird 3-4 shift
Senior User
Joined: Aug 2009
Posts: 203
Likes: 0
From: Ketchum Idaho
Mark,
I had a slipping problem shifting from 2-3 after towing a heavy load over 3 mountain passes recently. I'm planning to put in a 6.0 trans cooler, replace the accumulator valves with steel bodied ones, and do the TransGo mod at the same time what would yu you suggest? Since I'm a total novice I'd like to here some opinions from the forum.
I had a slipping problem shifting from 2-3 after towing a heavy load over 3 mountain passes recently. I'm planning to put in a 6.0 trans cooler, replace the accumulator valves with steel bodied ones, and do the TransGo mod at the same time what would yu you suggest? Since I'm a total novice I'd like to here some opinions from the forum.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
No, I'm not wrong. The 4R100 DOES NOT have the coast clutch on all the time except OD. It is only on when the OD is disabled, or the shifter is in 1 or 2. O don't know where you got your information, but it's wrong.
If the CC was on in the lower gears it would make the transmission a fully synchronous shift trans. It is not.
Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
Bill,
No, I'm not wrong. The 4R100 DOES NOT have the coast clutch on all the time except OD. It is only on when the OD is disabled, or the shifter is in 1 or 2. O don't know where you got your information, but it's wrong.
If the CC was on in the lower gears it would make the transmission a fully synchronous shift trans. It is not.
No, I'm not wrong. The 4R100 DOES NOT have the coast clutch on all the time except OD. It is only on when the OD is disabled, or the shifter is in 1 or 2. O don't know where you got your information, but it's wrong.
If the CC was on in the lower gears it would make the transmission a fully synchronous shift trans. It is not.
The transmission has had full engine braking in all the lower gears (not od)
since about 1997. It started in the E4 and continued thruout the 4R run.
The CC control with the od cancel was gone by 96? It was all about mpg in
the streets in the lower gears. It did not work well and was a saftey issue.
Thus the change was made.
Not shure on the year, but it was around the same time ford changed to the
digital range sensor.
Test a truck in a realtime scan and you can see it for yourself.
Its very clear on what the CC is doing.
Bill
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
Time for my two cents.
Mark is right.
The coast clutch is hydraulically controlled in M1 and M2 due to fluid routing by the manual valve. The coast clutch is controlled through the coast clutch solenoid when the shift lever is in drive range with the TCS (OD off button) in the "off" position. In addition, the only time the coast clutch solenoid will be on in gears 1 and 2 when in drive range will be if the TCS is on (OD off).
The 4th gear shift is ONLY accomplished by the application of the OD clutch....which subsequently causes the OD roller clutch to overrun instead of hold like it does in every other range. The coast clutch is NEVER applied in 4th gear (nor was it mentioned that it was earlier but I wanted to include this) because it will toast itself in short order.
Mark is right.
The coast clutch is hydraulically controlled in M1 and M2 due to fluid routing by the manual valve. The coast clutch is controlled through the coast clutch solenoid when the shift lever is in drive range with the TCS (OD off button) in the "off" position. In addition, the only time the coast clutch solenoid will be on in gears 1 and 2 when in drive range will be if the TCS is on (OD off).
The 4th gear shift is ONLY accomplished by the application of the OD clutch....which subsequently causes the OD roller clutch to overrun instead of hold like it does in every other range. The coast clutch is NEVER applied in 4th gear (nor was it mentioned that it was earlier but I wanted to include this) because it will toast itself in short order.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
I drive an '02 4R100 every day. Part of my drive is 30 MPH over some small rolling hills. With the OD on it's in 3rd gear and there is NO engine braking. When I lift off the go pedal the engine speed drops to idle. If I turn off the OD there IS engine braking and the engine does not drop to idle.
You're clearly wrong, but you're welcome to your opinion. I know for a fact that neither the E4OD nor the 4R100 was designed nor produced in the configuration you describe.
You're clearly wrong, but you're welcome to your opinion. I know for a fact that neither the E4OD nor the 4R100 was designed nor produced in the configuration you describe.
Postmaster
Joined: Feb 2004
Posts: 3,266
Likes: 0
From: Levittown
Not wrong at all.
There are many pcm codes that control a E4 and 4R.
Not just the 1 you speek of.
Your facts are wrong.
Data stream the CC in the E-series.
They have engine braking OD on or off.
The CC is controlled by the PCM outputs. (software)
The only other time is manual override (man 1,2)
My point is they are not all controlled the same.
I have run acrossed trucks that are as you state.
Just not all of them.
My van has 3.55 gears. You cannot feel the CC on at 30mph (3rd) decell.
Motor will only be about 100rpm higher with the CC on vrs CC off.
At TC lock it a huge diff in rpm.
I have run it on scans and a CC electrical bypass (man off/on electrical)
The sob is hard on brakes with a CC shutdown!
Bill
There are many pcm codes that control a E4 and 4R.
Not just the 1 you speek of.
Data stream the CC in the E-series.
They have engine braking OD on or off.
The CC is controlled by the PCM outputs. (software)
The only other time is manual override (man 1,2)
My point is they are not all controlled the same.
I have run acrossed trucks that are as you state.
Just not all of them.
My van has 3.55 gears. You cannot feel the CC on at 30mph (3rd) decell.
Motor will only be about 100rpm higher with the CC on vrs CC off.
At TC lock it a huge diff in rpm.
I have run it on scans and a CC electrical bypass (man off/on electrical)
The sob is hard on brakes with a CC shutdown!
Bill
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
We're going to have to agree to disagree. I know you're wrong and you know I'm wrong. Let's leave it to the readers to decide, because I can't convince you and you certainly can't convince me.
There are codes that keep the torque converter locked in lower gears and when off of the go pedal, but that is probably not what you meant. Any truck that is doing what you describe is either modified or broken.
There are codes that keep the torque converter locked in lower gears and when off of the go pedal, but that is probably not what you meant. Any truck that is doing what you describe is either modified or broken.
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