Ford Transmission :: C6 Does Not Automatically Shift Out Of 1st
Jan 23, 2016
I recently did a C6 rebuild on my 78 4X4. After the rebuild, when I go for a drive, the transmission does not AUTOMATICALLY shift out of 1st.
1. I can shift MANUALLY from 1st to 2nd with no problem, but it never goes into 3rd in D. If it was a system pressure issue, I suspect that I couldn't engage at all?
2. In Drive it just seems to be in 1st the whole time no matter how high the rpm.
3. I checked the vacuum at the modulator and I get 18 in .
4. I have tried every color modulator band and have the black one in now.
5. During the rebuild, I cleaned the governor, so I don't think it would be jammed up since it wouldn't shift even when I first drove it.
6. During the rebuild, I cleaned the valve body.
7. I confirmed the kick down is free.
8. I get a hard shift in reverse and from 2nd to 1st, but when I go to Drive, and then second, I dont notice a hard kick. Could it be that I messed up the orientation of the front clutch seal? (I hope this isn't the case!)
Here is the last couple of things I can do:
1. Could the intermediate band be the issue if I can shift in manual if it's not shifting hard?
2. The mechanic said it could still be a governor gunked up, but I'm skeptical since it never worked after the cleaning.
3. The filter screen pan from the rebuild seems to sit higher than the original that has a pipe that hangs lower. Is this the suction or the return from the system. If it's the suction I can put the original in.
Is it bad to drive her in manual if I need to? Obviously I'll keep the speed low since I can't get into 3rd. When I air pressure tested the transmission before the install, everything engaged like it was supposed to and all of my clearances were solid.
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For a while now my transmission has only been able to shift manually for about the first mile of travel when cold or if it sits for more than a couple of hrs.
I drove it that way for a while. Now it only shifts manually all the time and I have to shift from 2nd straight to overdrive. It won't shift to 3rd but stays in second gear until I shift to OD. Then I do have OD.
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Today I drove to work at 6:30AM (40 miles), no issue. At noon I drove home and the issue started again. Every bump I hit the light came on and the truck seemed to want to try and shift into 4x4 low.
I got home, parked the truck for a few hours, then went out again, no issue. But about 20 minutes later it started again. I pulled over shifted to 4x4 high, drove it, was fine, went into 4x4 low seemed fine, went back to 2wd drove it some more issue came back. I've read tons of online threads regarding 4x4 lights etc, none like this and none on F250 Super Duty (2008).
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If I am accelerating gently the 2-3 shift is as unnoticeable as the 1-2 shift is quick. Is the slow 1-2 shift causing the trans to protect itself and affecting the 2-3 shift? And if so, what do I do to resolve all of this? I changed the trans fluid a week ago and there is no change.
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I took it to my mechanic, he didn't do the transmission flush, and after a whole day of tests and diagnostics he says that the car has all the right timings and the only thing he could recommend is a transmission flush. He thinks the viscosity or correct viscosity could be causing this. My mechanic is fair and one of the better ones I've dealt with. In fact me didn't charge me at all for the work done.
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The mirror still seems to move freely enough and nothing obvious is rubbing.
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I don't think mine is normal as I don't remember it downshifting this much in auto mode. I'm thinking fluid level needs to be checked. I know there is a sensor in the transmission that senses the angle of the car so not sure if it's being overly aggressive or not.
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