Ford Transmission :: 1979 - Rebuilt C6 - Late Shift And Slipping
Sep 23, 2012
So against my better judgement I rebuilt my C6 myself. It's all back together and in my 79 F150 2wd 400cu. It seems to not want to shift into 2nd on it's own. I can manually shift it into all the gears but 2nd feels like it slips. So here is a list of parts with questions:
I used Mercon V instead of Type F. The transmission is a 1987 and the bottle says it covers vehicles requiring Dextron/Mercon.
I installed a FF servo lever with a P servo. My kit didn't come with a new spring. What effect would a worn spring have?
When adjusting the band, I set it to 120in/lbs and backed it off 1.5 turns. This seemed very loose to me. It leaves the set screw finger tight/loose, so I tried turning it in 1/2 turn but that made no difference and I won't drive it until I readjust it. Also it's a RedEagle wide band, but that shouldn't make a difference.
One place I think I could have a problem is with the modulator. I didn't have a scale to do the 12.5 lbs method, but I had a big syringe, vacuum guage, tubing and t fitting. I could hold the -15" of mercury but the rod didn't go in to the notch like it said it should. I was going to stick the old one in but it's bent and the rod is missing. Will a bad or misadjusted modulator cause the tranny to slip in 2nd? I don't think it's inbetween gears because it does accelerate in 2nd.
I used the BadShoeProductions video along with a Ford Shop manual to assist me.
Complete list of replaced items:
New Modulator
F servo lever with P piston
All Friction and steels
Pressure plates for additional friction plates per video.
All Seals and gaskets
New wide band
New pump
Hughes torque converter
TransGo shift kit
New Sun Shell (Took my end play from .070 to .012)
Everything was cleaned and tested ok per video.
Then only problem with the video is it doesn't tell you what to do when you have a problem, only shows you how to tear down and reassemble.
I used a torque wrench for everything, but if it turns out it's a valve body problem then I will go back through it but only using a nut driver.
The kick down rod is working properly.
My gear selector is set properly.
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I have a 2009, 4x4, 5.4L with 78k miles. The transmission works overall but it seems to shift late and creates a mushy feeling. If you put your foot down, it will downshift and take off so it's not a power issue. As I've read on this forum, mine also searches for the right gear often and overall seems to shift too much. Seems like a computer reflash would fix it as I think it's just the shift timing. Computer reflashed? Is this possible or available from the dealer?
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Just made it back from out of state hunting trip,driving to get new tires. And heard a bump sound , Driving about 40 mph and tack jumped from around 1800 rpm to 4500. Engine' smooth and parameters good . However will drive in low and 2 nd gear approximate 25 mph. When select drive will not shift into high without slipping an rapid rpm increase. Currently 135k service record's and general appearance were well maintained....
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I have a 2005 Ford Taurus. We had an $1800 rebuilt transmission put in 8 months ago and it's already giving us problems! The engine light has also been on. We took it to autozone and multiple codes came up. We've already put way too much money into this piece of shit and I don't want to get screwed by another mechanic! Where do we go from here? Is there anything we can fix ourselves? The codes are p0300, p0301, p0305, p0316....
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I got my blazer look at and here what they come up with so far. Transmission fluid is discolored. Transmission shifts late between 3rd and 4th at 52 mph. Transmission slips between 2nd and 3rd gears at 32 mph. Lock up 41-43 mph in and out. I never told them this but I change the transmission fluid about a week before i took it there and when I check the fluid it was nice and clean and not burned like he said it was. He said most likely it internal damage.for them to take a look in side to see what is wrong with cost me 400.00 and I said no.
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Just installed new clutch and everything good except pedal doesnt comecall way up now have pull up with foot, ans grabs rt off the floor, i assume just need to adjust? Make adjust rod longer?
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I am looking to change out my manual transmission in my 79 f150. I want to put a 5 speed in it but still keep my manual clutch. I have a 300 engine that I also want to keep, can I just put a late 80's early 90's 5 speed transmission in it and keep my original bell housing?
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I swapped in a manual trans in my 79 f250 4x4 about a year ago. i had the trans gone through before i put it in. I installed a new luk clutch, resurfaced the flywheel, new throw out bearing, etc.
Ever since i installed it there was always a clunking noise in the trans. I drove it and didn't think much about it until recently where im just fed up with it. the trans always shifted nice and tight with no grinding.
In the past few weeks i picked up a parts truck for the trans thinking that's what my problem was. I drove the truck before i pulled it and it mad no noises whatsoever. I had it gone through and reasealed it before i installed it. I pulled my old trans and it still looked good with no slop on the input shaft(which i thought that was the problem). I installed the new one and once again same noise.
I decided to pull the trans again this time pulling the bellhousing and checking the clutch. It looked like new to me still and i saw nothing abnormal. Put it back together and still the same. I swapped the transfer case too, checked both driveshafts all is good. I am thinking its coming from the bellhousing(maybe the clutch is bad)
So here is a video and you can hear what I am talking about it happens mostly when I engage the clutch and i am coasting. it is much louder now with no carpet and the trans hump cover off.
Np 435 transmission clunk - YouTube
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This is a photo of my '79 F250 4x4 rear axle (Dana 60 full floater) this seal will leak in a few miles ..what I need is the part number of a replacement seal made like the one in the lower photo ..it seems that Ford no longer has this seal.
Notice the increased distance from the bearing to the sealing lip in this photo ..the sealing lip on the new seal in the upper photo lies almost on the bearing, this one just barely engages the seal surface on the axle stub. I can machine the bearing pocket deeper to cause the seal to move farther onto the sealing surface, but that would also cause the bearings to be closer together, and may cause problems there.
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I used my truck in 4x to pull a couple of little stumps. Nothing major, just put it in 4l more or less to keep from tearing up the yard. Noticed a couple of weird things today. For a minute had a good pull to the right. Just felt "weIrd" in front end. For lack of a better explanation. Jacked up and checked for play, nothing unusual. Took off the tire and checked other stuff and couldn't find anything. Lubed up joints etc and drove later. I'm hearing a slight " clanking" noise in front. I know it's got something to do with the 4wd but I don't know where to start.
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I've been running type F since I bought the truck about 30k miles ago. The dipstick says to run M2C138cj which I recently found out is NOT type F! I hope I haven't destroyed the clutches. How I can get all of the old fluid out. Also I can't find any transmission fluid with the ford M2c138cj spec is Dex-Merc III backwards compatible?
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I test drove my truck yesterday for the first time with the newly rebuilt transmission. I was gentle with the right foot and all seemed well. Once out on the main road it shifted by itself into overdrive for the first time and immediately the O/D light started flashing. I drove it home and shut her off. I test drove it 2 more times leaving overdrive off, no issues. With a snap-on scanner hooked up I let it go into overdrive and O/D light started flashing again, not immediately maybe 5 seconds after shifting into O/D.
Codes are:
p1316 IDM codes detected
P0717 Turbine speed sensor circuit fault
P0715 Turbine speed sensor circuit fault
P0500 VSS fault
10 minutes ago was my last test, O/D flashes only after it has shifted into overdrive. I checked the transmission wire harness and all connections are tight, trans oil level is good & trans temp never went above 150. Could this be a faulty VSS?
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79 F150 400/C6 2wd. Loss of reverse and it doesn't want to stay in high.
Strange thing happened today. I took my truck on it's longest test drive since rebuilding the transmission. It was about 25 miles. I got to the junk yard just fine and it was running just fine when I left. I went through a drive through to grab a burger and headed home. That's when it started acting funny. It shifted fine 1st to 2nd, then 2nd to 3rd, but it wouldn't stay in 3rd. It would shift into high, but the slightest bit of throttle and it would shift back into 2nd and eventually got so bad that it just stayed in 2nd, so I had to return to the town I was leaving.
I drove to an autoparts store nearby. I decided to move where I was parked and when I put it into reverse, nothing was there. It rolled back. I drove it to the new spot and called for a tow truck. Weird thing is that reverse worked just 10 minutes earlier when I left the junk yard. When I got it home 2 hours later, it backed up under it's own power. I let it cool down completely and took it for a test drive and it drove perfectly. I have a few theories or questions:
Kickdown rod: Can it be in such a position that it could take away reverse? I would assume that if the spring wasn't returning it all the way forward that it wouldn't have shifted from 1st to 2nd properly. I ask this because I am not using the Holley spring mount and I'm wondering if the wrong spring set up allows the kickdown to be partially activated.
Fluid: What fluid are you suppose to use after a rebuild and what fluid can't you use. Mercon V says it supercedes earlier fluids, but is that wrong?
Am I wrong to assume that if fluid was the problem that I would have had problems with 1st and 2nd?
Cooling: What are signs of hot fluid other than smelling it. Once again, assuming I would have problems with all gears if fluid was too hot.
My guess is that something is sticking in the valve body, but before I drop the pan and pull out the valve body, I want to make sure all other avenues are exhausted.
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Our 2003 Odyssey had the transmission rebuilt last month after the original finally failed (215,000 miles). After the rebuild, third gear has a whine. (I don’t recall if it was there before the rebuild – it’s the wife’s ride, she wouldn't have noticed it anyway, and apparently I didn't either). The whine pitch varies with RPM, and is louder if the transmission is under a load. Going up a hill with the accelerator depressed makes the whine louder – taking your foot off the accelerator quiets it. I have a warranty for two years on the rebuild, but before I go back and start asking them about the noise, I was wondering what would cause it? I am worried they didn’t rebuild everything and will just tell me the whine is “nothing to be concerned about.” The transmission shifts smoothly and appears to operate normally other than the whine in third gear under a load.
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Car is a 97 civic. I had a input shaft bearing replaced since i had the tranny off. I decided to change the flywheel clutch and bearings. After install I have cold not shift into gears with engine running. I fixed the problem by removing almost all of the free play in the pedal. Should i replace the master to get some of the free play back in the pedal?
Second and main problem, when i release the clutch pedal there is a ratchet/grinding noise. It changes with engine revving and the further out the pedal the louder the noise. I think i attached a noise clip. I have dropped my transmission to ensure everything is installed correctly. reinstalled the tranny with the same noise. Bleeding the clutch did not work either. Pedal does seems soft but not getting stuck.
New parts:
Flywheel
Pilot bearing
Clutch disc
Pressure plate throwout bearing
Transmission Synchs
Bearing kit
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I drive a 1997 GMC Jimmy, with 250k miles (all mine). So, I had to have my transmission rebuilt, and the second time I picked it up (we won't talk about the first time) I drove it for a couple of days, and was leaving an icy parking lot, and put it in 4hi. I had it in gear at the time, but wasn't moving at all, and simply pushed the button. It made a grinding sound, then slammed into 4wd. I dropped it off the next day (again), and was told that I cannot put it into 4hi on the fly, that I shouldn't be doing that at all, that when you have a transmission rebuilt, you shouldn't ever do that again.
Given all of the trouble I've had with this highly advertised local transmission shop, I'm not inclined to believe a thing they say- So, I'm asking you all; When I had my transmission rebuilt, did I in fact lose the ability to put into 4hi while vehicle is in gear- let alone moving? I'm not talking about 4lo here, I know I have to be completely stopped and in neutral for that, even my manual says I can go into 4hi safely up to speeds of 45 mph. I still haven't picked it up from the last time I took it in, I didn't have any trouble with 4wd before the transmission rebuild. The first time I picked it up, my driveshaft fell out.
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My tranny slips in drive and od when it is warmed up.It's fine for a few miles when it is cold.Did a quick search and it seems like it might be a bad mlps.
My question is, Will a bad mlps act up all the time or just when it's warmed up? Will a mlps and connector from a 91 tranny work on a 95 tranny? Don't really want to throw money at it if it will need a rebuild.
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Ok so when I come to a full stop my truck doesn't want to shift right when I take off where do I need to start looking
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2000 X V10 4WD... 178K. Truck was not well maintained for most of it's existence. Drained both the TC and Drain pain and replaced the oil filter. Tranny oil looked like crude and a lot of tiny specs of metal - it shimmered in the sun... needless to say - I'm pretty sure it had never been changed.
Now - issues since I've gotten it done... Tranny has been slipping... I figured that I may not have filled it enough and after adding a few quarts, it seems to have stopped. Slipping was initially just when going from a stop.
Now it's having a problem where the engine dies when I shift from one position to another... For instance - from Park to Reverse, the engine RPMs drop as the clutch engages - but they drop from about 900 RPM down to about 500. And 50/50 chance the engine dies. Going from Park to Drive, the same thing but maybe drops to about 700 RPMs. Tried it in 2nd and 1st gear. Has happened in both. I've tried shifting to OD first before going to 2nd to 1st or vice versa and seems to behave better.
Should I flash the ECU and have it relearn the shift points? Did I overfill? Between the TC and Drain Pan - about 16 qts came out. I've been checking the dipstick - no frothing or bubbles. When running and in park - it actually shows low. Seems to drive fine once it's on the road. The engine cutting off when it's put into gear is really unexpected.
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This is on my 7.3PSD. I've observed that the 1-2 gear shift drops about 1,000 RPMs and takes a good half second or longer to do so when given a lot of accelerator pedal input. And then the 2-3 shift is a very quick and harsh shift.
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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My tranny is slipping all over the place . I recently less than 1500 miles ago changed tranny fulid, tree branch and TP filter, ford filters, and 8 to 9 quarts of mercon SP. My truck is shifting like a bucking bronco. Came up with PO671. So should I replace just the 1 solenoid. Or all the valve body? I plan to run a gauge in cab to see shift pressures for testing purposes to aid in troubleshooting for current issue... reason for fluid change is history unkown.
2004 6.0 f250 4x4 tourque shift OdO is 163,800...
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