Tranny help
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Tranny help
OK, just bought a 1986 F250 4x4 with C6 trans. Trans was rebuilt and fellow said it worked about a week and reverse wouldn't pull. Later it wouldn't pull at all. It pukes fluid when running wether in gear or not. I think the tranny cooler is cloged (in the radiator) I noticed that the external tranny cooler was not used when he put the trans back together and the radiator looks like it is shot ( on the inside). I'm going to try to pump some cleaner throught the radiator cooler to see if it's cloged, Could that be why it won't move. you can feel it bump like it's in gear but it just won't pull. I've tried tranny shops but they just want me to bring it in and I have to fix the glow plugs first. Thanks in advance for any input.
Post Fiend
Joined: Nov 2004
Posts: 5,638
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From: Manitoba
C6 has a few sensors...... the main one item.. is there correct vacuum # in your vacuum system. The VRV (vacuum regulating valve) on the IP needs to be set correctly, the MLPS (manual lever position sensor) on the trans needs to be aligned correctly, and the modulator valve needs to be hooked to vacuum. As for the external cooler you can't clean them .....replace it with one for what GVW weight you will be at towing........
Open up your accept "Private messages" or emails..... you can't send any yet, but I think you can get them.
Open up your accept "Private messages" or emails..... you can't send any yet, but I think you can get them.
Post Fiend
Joined: Oct 2007
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From: Faibanks Ak.
If low and reverse doesn't pull and it's full of fluid sounds like you have a ptoblem with the tranny itself. You can run a rubber line between the two lines by the radiator to test it. If the cooler and lines wasn't flushed at the time of rebuild possibly run some junk back through it.
Lead Driver
Joined: Dec 2006
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From: So. Jersey
When you say it won't pull what do you mean? In Reverse, if you give it throttle does it act like your foot is on the brake or does it rev up as if it's in neutral?
You may have planetary one way clutch damage and/or servo seal leaking. May also have bad low/reverse clutches or inadequate pressures.
Unless your confident enough to disassemble the trans yourself, I would consider bringing the trans to a reputable shop for a diagnostic or rebuild.
If you can give a little more specific details we will do our best to help.
You may have planetary one way clutch damage and/or servo seal leaking. May also have bad low/reverse clutches or inadequate pressures.
Unless your confident enough to disassemble the trans yourself, I would consider bringing the trans to a reputable shop for a diagnostic or rebuild.
If you can give a little more specific details we will do our best to help.
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Thanks for the input. When you put the truck in gear (as in drive) I can feel it go in gear but when you give it throttle it just revs, It tries to move but it won't. Hopefully I will get to tinker with it tomorrow ( It's been raining like crazy today.
Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
Is it hesitant only at the first engagement of the day ("cold start")? or is it sluggish to go from park to forward/reverse no matter how much it has been driven during the day?
To the original poster, I would try and verify that the cooler is flowing and take if from there. If that checks out, then you might try dropping the pan to inspect the inlet screen at the valve body and see what is (if anything) is found on the inside of the pan.
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I had this same problem with one of mine it turned out to be the torque converter (rebuilt) self destructed and filled the valve body with shavings.
Dennis
Dennis
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Post Fiend
Joined: Feb 2009
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From: Ottawa, Ontario
Could be a lot of things. Maybe a torque converter drain back problem.
Is it hesitant only at the first engagement of the day ("cold start")? or is it sluggish to go from park to forward/reverse no matter how much it has been driven during the day?
To the original poster, I would try and verify that the cooler is flowing and take if from there. If that checks out, then you might try dropping the pan to inspect the inlet screen at the valve body and see what is (if anything) is found on the inside of the pan.
Is it hesitant only at the first engagement of the day ("cold start")? or is it sluggish to go from park to forward/reverse no matter how much it has been driven during the day?
To the original poster, I would try and verify that the cooler is flowing and take if from there. If that checks out, then you might try dropping the pan to inspect the inlet screen at the valve body and see what is (if anything) is found on the inside of the pan.
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By passed cooler today with same results. Dropped pan and found a film of grey sludge covering the bottom. The filter is fine. When I put it in drive it bumps like it's in gear the motor revs like it's in neutral. I also hear a something that sounds like a backho when you extend the bucket all the way out (like the hydros are straining). I going to pull the valvebody tomorrow to see if it's in order. Also the trans was over full by a couple of quarts, don't know if that would make a difference.
Posting Guru
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From: West Valley Utah
By passed cooler today with same results. Dropped pan and found a film of grey sludge covering the bottom. The filter is fine. When I put it in drive it bumps like it's in gear the motor revs like it's in neutral. I also hear a something that sounds like a backho when you extend the bucket all the way out (like the hydros are straining). I going to pull the valvebody tomorrow to see if it's in order. Also the trans was over full by a couple of quarts, don't know if that would make a difference.
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OK pulled the valve body out and tore it down today. Found the large and small internal servo accumulator valve springs are broken ( I have a trans manual that's the only reason I know what they are). Also th 2-3 shiftspring is missing (I didn't see it come out and I don't see it laying anywhere). I also found that the corner of the valvebody is broken off. It's just enough to get in to one of the valley's. I'll hopefully have it back together bye the weekend ( my weekend is over so I only have about 30minutes per night to work).
Lead Driver
Joined: Nov 2003
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From: Campbell River, B.C.
Grey sludge isn't a good sign here. The sound you are describing almost sounds like torque converter buzz. The AOD in my F150 did that for nearly all its life under the same conditions, but the C6 that my diesel came with never did. Dropping the valve body will expose the rotating parts but I'm not sure how much you will actually be able to see in the way of damage or clutch pack wear.
The sludge tells me you could have a burned out clutch pack.
Don't know for sure if the high fluid level could really cause something this severe but I have my doubts.
An expoded torque converter is also a possibility as some one else already mentioned. Generally, thats a problem with later E4ODs, but C6s can do it too.
The sludge tells me you could have a burned out clutch pack.
Don't know for sure if the high fluid level could really cause something this severe but I have my doubts.
An expoded torque converter is also a possibility as some one else already mentioned. Generally, thats a problem with later E4ODs, but C6s can do it too.
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