Transmission not shifting?

Good evening,

Yes, that would be a start but there may be more damage internally. From being bad over a year, it could have progressive damage like a drum, band, or valve body issue.

This guide will help us fix it

https://www.2carpros.com/articles/automatic-transmission-problems

Roy

2001 f-250 super duty 5.4 aluminum headsgas auto with overdrive

my f 250 will not shift out of second gear, when going down hill truck speeds up from 2nd gear and engin does not have restriction from trany. as truck costs i try to excelerate and the tack just reves up. pulled over to cycle gears and the truck will not go into reverse.. extremley cold.. new fluid installed but not filter truck drove well last 2 days but acting up today.. any thoughts.. fluid is above fill mark but not fomy/

the truck is in limp mode on transmission take it to a trans shop probably needs a rebuild

We just replaced the transmission with brand new one
The gears will not change from drive and will when you put it into 2nd. It also idles high

make sure all your electrical connections are good , check fluid to be full then scan for codes. for high idle clean throttle plate on both sides and iac hole with choke cleaner then check for vacuum leak.

I have an F250 and it won't shift from park unless you press the brake in hard. Any sugestions on what's causing the problem?

The mlps, known as the neutral safety switch, could be out of adjustment, or the electrical end if it could be acting up... possibly a good idea would be to replace the brake light switch, it's cheap, and relatively easy to do, see if it makes a difference

Has overdrive (button on steering column), three speed automatic transmission behind 351 W. Trouble shifting from first to second. If I go high revs then back off quickly it shifts. That is my only problem.

it sounds like it is struggling to build fluid pressure. Either it is really low on fluid (meaning there is a leak to be fixed), or it needs the fluid and filter changed. At that mileage, if it has not been changed at least once, then that is probably your problem.

Changed filter and fluid a year ago. It had the problem before and after that.

I still believe that it is having trouble building pressure for one reason or another. If there is a dent in the transmission pan, that could cause an issue as well.

I am not big on transmission additives, but I have had decent luck with this stuff:
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I do not see a 5.8l engine being offered in the 1998 F250, so my question has got to be is this the original transmission or not? If not, is it an electronic transmission with shift solenoids?
Or the old type transmission with I believe a intermediate band?

So sorry! It is a 1995.

First I had a problem with the truck engine having a bad misfire while the transmission was fine.

I read codes and got a EPC electronic pressure control code. I found the bad wire coroded off at the trans harness connector, So I repaired and EPC code went away, Along with the misfire.

But now the transmission takes off in what seems to be 2 or 3rd while in OD range and other erratic behavior.

So currently I read codes and I get code 512, 121 and cannot seem to reset them by disconnecting the batt terminal.

one code is the eec processor keep alive memeory failed and theother is throttle position out of test range. the tps diagnostic is binding throttle, tps not seated ,faulty tps and or faulty eca. code 512 may have been done when you disconnected then reconnected battery. check for a bad fuse or burnt fusible link.

I am going to assume this has the C6 transmission. Try adjusting the intermediate band. Loosen the lock-nut a few turns, while holding the screw. Tighten the adjustment screw down to 10 ft lbs. Then back off one and half turns. Hold the screw in this position while you tighten down the lock nut.

What fuse, or fuse able link should I be looking for, and where?

Thank you, I will try that.

I checked fuse 13 which is a 15a and it was not blown. Can I check at PCM, Where is PCM.

Speedometer works, And transmission will only shift starting in 3rd to overdrive.
While in the Drive range.

I really need to take care of these issues.
How do I check KAM power at PCM?

check the starter I have them pointed out in pic. also check by fuse box.

check fuse 1 in engine compt and eec relay pic enclosed. kawpr is pin 1 on pcm. If you dont' know where that is have a pro do this as it sounds like you really need more h elp than we can give.

It was the EPC wire going to the transmission that was corroded.

Transmission problem
1989 Ford F250 Four Wheel Drive Manual 80000 miles
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I have got a 1989 Ford F-250 7.3 Liter Diesal Straigh Drive and it has been setting for 6 months and has not been cranked i went out there today and cranked it up, it run fine, but i left it running and pushed the clutch in and tried to change gears but they would not change. I went to the auto parts and got a new slave cylinder and put it on and bleed the line but it still did not change gears.

Hi cowgirl92018,

After sitting for so long, the clutch disc might have got stuck on the flywheel.

Engage reverse or first gear and depress clutch, start engine. You might have to stop and restart a few times and there might be a loud noise when the clutch pops free.

CAUTION : Vehicle might move so make sure nothing is in the path.

My transmission will not shift from second gear to third gear. It goes beautifully from first to second and then it just stays in second.
If I drive long enough , about 15 minutes, the vehicle, still in second gear, will begin not to catch, then not catch at all. Step on the gas and you get nothing, but the engine is revving up while the transmission slips completely, while still in second gear. If I roll to a stop stopping the vehicle, then step on the gas, the transmission will then catch again immediately. I can go through first, then second and will not shift any further, and soon it will again disengage.
The cycle will repeat itself, with the engine eventually begins to overheat.
The catalytic converter was installed where it actually touches the side of the transmission valve body area. Could that cause the transmission to overheat? Also there were a lot of metal shavings in the pan when I removed it. I did change the fluid and added a lubricant, it did not work.
i have the valve body off and I am preparing to take off the plate to clean it and check the valves.

If the catalytic converter is touching the transmission and it heats the fluid, that is a possible explanation of why, as I drive, the fluid heats up to where it is causing total slippage?

But, if I stop for a second and then take off again, first and second work fine, but it still will not shift to third, and the time between stops becomes shorter, the engine gets hotter, until I am revving the engine with minimal result and third still will not commit. I do not push it any further.

How serious is the cat touching the transmission scenario? I assume I should fix that.

I was told the metal shavings could be the cause of the valve sticking?

I have the valve body out and was going to remove, clean and replace?

The catalytic converter touching the transmission is pretty serous I would not want that on my transmission. What I would worry about is were is the shavings coming from? Also you say it stops moving in second gear, that also sounds like a major problem. I would do a pressure test, but the transmission has to be together. The shavings in the valve body is the least of your trouble because you will never get all the shavings out of the torque converter. You can see if the shavings are in the valve body they could really be anywhere depends where they ended up at, but it sounds like the transmission is having a internal failure.

Here is a link to an article from this site that will show you how to run further diagnostic test on your transmission.

https://www.2carpros.com/articles/automatic-transmission-problems


Please let us know what happens so it will help others.

Cheers

My Ford-F250 had this same problem. I would get the catalytic converter fixed right away. That ended up being the source of my issues. As soon as I got it moved and changed some sensors, it shifted beautifully. I hope your solution is as simple.

Hey,

Great addition to this thread! Please feel free to help out on the site whenever it can add information that will help people.

Best, Ken

My 98 Chevy Tahoe is doing exact same thing. I had the transmission rebuilt it worked fine for a yr and now it's acting up again. It will shift up to 2nd and that's it.
Did you get it fixed??

This could be a new problem can you please post your question here

https://www.2carpros.com/questions/new

Cheers, Ken

My '76 F250 460 is having some issues. The automatic C6 Transmission will not shift into any gears. I have already done several linkage adjustments. She has broken down for about a year. I finally got her running after replacing the fuel pump last night. The last time she was running she wouldn't shift into reverse. So now she starts, but is only stuck in what I assume to be the parked position. Any ideas of what the fix might be? I'm aware that the c6 tranny is pretty simple to work on and has many common issues, but I have yet to find a link on this particular issue.

Is the trans fluid clean and full? You say it is in park, can you place it in neutral and move the truck or is it truly stuck in park? Is the linkage shifting at the transmission?

To be honest, these are really good transmissions with few problems. Let me know what you find or have found.

does the shifter move at all? if it does it may be broken off inside transmission. Or the shift valve is stuck in the valve body but there may be a bunch of crap there and has got into valve body or plugged up the filter so you can'tdrive it.

The tranny fluid is clean and full. I have not yet attempted to put it in neutral and push it. The linkage moves in all positions as well as the shifter. I'm not sure if the whole tranny needs to be rebuilt or not. I've also read that it might be a vacuum line causing the issue.

if the shifter moves then you probably have a vlave body/pump problem or a clutch pak. If you had changed the fluid recently then you may check to seeif the filter is in all the way as that happens a lot along with the oring around filter not being on. I've got a whole set of repair books for that year pickup.

Just wondering the best option to fix transmission in my F250. It has a ZF 5 speed manual box. Dropped the oil out of it had metal through the oil, one of the shafts are buggared and also a bearing or to are stuffed. Have'nt got all the info yet but was wondering wheather to rebuild it or just source a replacement transmission assembly