Ford 6.7L Power Stroke Diesel :: Loud Clunk / Bang When Downshifting Under Load
38k and 15 months old. Runs fine except...
Can be in cruise or not, tow/haul or not, but need to be pulling a decent hill with 7k+ trailer. Running level with air bags. Regardless of speed, cruising at 50, 58, or 65, beginning incline and turbo boost builds normally to maintain speed to the point when it needs to downshift. BAM!!, not just a clunk, 90% of the time- scares the hell out of me. I can make it do it on an incline empty, but it it difficult. If because initial speed is 50ish, a second downshift to 4th may be needed. A bang only 50% of the time.
No codes.
Regardless of the degree incline, (toughest in the NC/KY areas is 6-7% grade, can avoid harsh shift by backing off on throttle and manually downshifting to 5th or 4th, depending upon speed.
Can "make" it do it on level terrain with 7k trailer if I slowly back off throttle and slow from 65 to 50 or so and punch it, but not too hard. Too hard and it goes to 4th, usually with just a modest clunk. Just right and I get 5th with a loud, and I mean loud BAM. Even the tech was impressed.
Afraid to hook up my 17k 5er and take off for the next 3 months, which is the reason I bought the truck to replace my 11...
Carrier bearing has grease coming out of it (400k on various duallies and never seen this), but dealer says not an issue.
Ford told dealer that it had no idea, and advised tech to do a lot of pin point electrical testing and everything checks out. Next stop is the inner workings of transmission.
I have been without it and work for 3 days because of backlog. Running two day load tomorrow, then back in for tranny work.
Ford 6.0L Power Stroke Diesel :: Clunk Sound Going From R To P Or R To N
2003 6.0 FX4 w/ Auto Transmission, 180,000 miles
Last transmission service - unknown (I have owed the truck for 3,000 miles). I just acquired a clunking sound when shifting from R to P or R to N. No noise from N to D or lower or back up to D. It does not grind into gear, just clunks one time. It is rather loud.
All shifting while driving is normal, no slipping, or noise. This occurs on level ground, at operating temp, and +-650 RPMs.
Fluid level is okay. No strange odor. What will be the next steps to investigate?
Ford F-150 - 1997-2003 :: 2002 - Loud Clunk While Shifting - Floor Vibrates When Foot Off From Gas?
I have an 02 f150 ext cab fx4 with just under 140,000 miles my first problem was when I shift from reverse to drive I have a loud clunk/bang I was trying to find out what was wrong so my brother in law was looking out the drive shaft he pushed it into the rear end now when I am over 65mph and take my foot off the gas I have a vibration but only when I take my foot off the gas and above 60-65mph the steering wheel or peddles don't vibrate but the floor does .
View 3 RepliesFord 6.7L Power Stroke Diesel :: Slight Bump / Clunk When Downshifts From 3 To 2
I have searched and have found a few threads on various transmission shifting issues. However nothing really pertaining to 13+ trucks that is only happening under certain conditions. It seems earlier trucks with problems were experiencing it all the time, not intermittent.
Here's what I got.... This only happens when:
- temp is 20 degrees or colder
- Truck has been sitting and is cold
- Trans temp under 70-80 degrees
- Only happens on the 3 to 2 DOWNshift when cold
The first few downshifts from 3 to 2 have a slight clunk/bump to them...just enough to feel it. After the first few initial downshifts from 3 to 2, it will not do it then, shifts fine and smooth. After a minutes of driving it, it will not do it until the next time it meets the list of items above. If I skip this gear manually until it has warmed up, it will not do it when returning to it.
-All other gears both up and down shifting feel good just the 3 to 2 when it does happen.
Once the transmission is warm or the temp is warmer outside the problem is non-existent and transmission shifts great in all gears and is smooth as butter!
Ford 6.7L Power Stroke Diesel :: Clunk In Drivetrain When Starting And Stopping
Whenever I take off from a stop or slow to a stop, there's a clunk in the drivetrain. It feels like a bit of play before the drivetrain engages and when it releases...torque converter maybe? Taking to the tranny shop soon...
View 10 RepliesFord 6.7L Power Stroke Diesel :: Transmission Clunk At Random Times From Park
It clunks real bad at random times. Whether I have had the e-brake on or not (sometimes even with it on, so I have not put any load on the locking mechanism in the tranny).
Its a 2014... Does not matter if its inclined ground or flat.
My 08 F350 V10 it replaces never once clunked.
Ford 6.0L Power Stroke Diesel :: 2006 - In Tow Mode Tranny Clunk And Shudder?
2006 long bed with LS diff sometimes gets a fairly robust CLUNK! sound and feel when decelerating with tow mode engaged. It only happens once per 20 trips and only about a mile down the road, and it only happens once in a blue moon. It definitely is the rear end making the noise and brief shudder. Otherwise the truck runs extremely well.
I had the pumpkin off and fluid changed with Ford friction modifier added at about 100,000 miles. Truck is at 160,000 now. I just got done with a trip in the mountains of Idaho carrying a truck camper and used tow/haul mode extensively for engine braking and climbing, worked like a champ. This was just one trip of many this summer. This is about the only thing wrong that happens on my truck, but usually occurs before I get very far from the house. Should I just forget about it?
Ford 6.7L Power Stroke Diesel :: 2015 - Shaking Under Slight Load Due To A Small Incline And Loud Diesel Sound
So I have just over 14k on my 2015....... I love the truck but have had a few small issues. I had a water leak coming in from the roof that would leak through the grab handle. Nothing major dealer replaced one clearance light seal and they said the windshield needs to be re sealed.
Then I had a god awful irritating squeak in the dash..... It only does it late In the day when it's been hot. The dealer said it was a loose air bag. I have had the truck back a week and it's doing it again.
Those are little issues that will get resolved...... I hate having problems with a brand new vehicle but I understand it happens and that's what warranty is for.
I also reported a bad shake to the dealer...... The truck will shake very violently and have a very loud "diesel" sound. It's very specific at when it occurs. It has only done 4 times in the past 6 weeks including today. The odd thing is the 4 times it has done it has been the same time of day in the exact same spot on the exact same road!!!!
Basically I leave my office sit in some traffic and by the time I get to the parkway it has been35 minutes or so. Only happens in 6th at 60 which is roughly 1,400rpm a slight load due to a small incline and it shakes real bad! The typical "diesel" sound you get when under a load is very pronounced almost to a knock. It will continue to do this as you slowly increase throttle until it down shifts and then goes away. I also caught it doing it and I manually shifted to 5th and it went away.
Because of the rpm at which it happens with slight load only doing it in 6th I lean to a Trans issue and more so a converter problem. It feels like converter shutter. I just don't understand the engine sound.
I gave very descriptive info to the dealer..... Several techs drove it and could not duplicate. I just picked the truck back up last Thursday and the dash squeak is back and the shake happened yesterday and again today. So I am a bit irritated to say the least.
I really hate the fact that I know there is a problem but I also understand if a tech can't duplicate it he can't diagnose it. However today I did get a video of it with my phone so they will know I'm not making this crap up!
Ford 6.7L Power Stroke Diesel :: Down Shifting At 60 MPH / Torque Seems Low
When I'm at 60 mph and go full throttle, it doesn't seem to down shift enough and the torque seems low. But when I go 1/2-3/4 throttle, I get the power I'm looking for. I'll test it later today and see what gear it shifts to with both.
View 4 RepliesFord Super Duty (1999-2016) :: Clutch Slipping - Harsh Shifting - Loud Clunk Noise Into Gear 2 Then 1
New truck 11000kms ago thats done medium amount of work but nothing heavy or sustained for long periods of time. I get the feeling of clutches slipping especially when truck is cold but also when normal temps. Doesnt make any weird noises or anything. I can really notice the difference in torque if in manual mode being much better, but still not perfect if i stomp on the gas pedal and go through the gears in manual mode will still slip. Also is really harsh shift if i come to a halt in 3rd manual mode with the brake pedal depressed push minus button the truck makes very loud clunk noise into gear 2 then 1. Took it to ford they couldnt find anything ? Thinking of trying another dealer.
View 2 RepliesFord 6.0L Power Stroke Diesel :: 4x4 LOW Light Stays On / TC Not Shifting
2003 F250 6.0 ESOF - 4x4 and LOW lights on, TC not shifting
About the truck: 2003 F250 CCLB 6.0L 210k Miles
Heavy Duty Bulletproof Diesel Kit
Warn Front Manual Hubs (vac lines clamped/blocked)
Transfer Case Shift Motor/TCSM is off (I personally have not tested it and am still looking for what to test on it) or I will purchase a new one.
From seller: "What happened is, I accidently put it in 4x4 and when I turned the switch it would not go out. I had to limp it home slowly. When I got home I messed around with it, and could not get it to go back into 2x4. I removed the shift motor, and tested it. It tested ok. I shifted to back to 2x4 with a wrench and left it."
CURRENTLY the TCSM is off the transfer case and is in 2WD. Warn hubs are set to "FREE," seller also noted that this is how he has been driving it for quite sometime. TCSM is in 4x4 LOW, that is what I have to manually shift the transfer case to if I want to mount it up. I have been shifting it using a 14mm open end wrench and with the transmission in neutral. I have not tried turning the TCSM position manually.
Scanning using AE brings up different codes depending on transmission position and which scan is used:
P1812 4-Wheel Drive Mode Select Circuit Failure
P1819 Transmission Neutral Safety Switch Short Circuit To Ground
P1832 Transfer Case Differential Lock-Up Solenoid Circuit Failure
P1876 Transfer Case 2 Wheel Drive Solenoid Circuit Failure
P1865 Transfer Case Contact Plate Power Short to Ground
AE scanning for DTCs: P1832 and P1876
AE scanning using OnBoard System " SYSTEM SELF TEST" with transmission in PARK: P1812, P1832, P1876
AE scanning using OnBoard System " SYSTEM SELF TEST" with transmission in NEUTRAL: P1812, P1819, P1876
AE scanning with TCSM off: P1865, P1832, P1876
P1865 seems to be solved by simply installing the TCSM.
AE Live Data shows correct indicators for 4WD switch, showing corresponding drive mode in AE as the switch setting but nothing happens. No clunk/thud/movement. I have tried resetting the codes but the 4x4 and LOW lights both stay on. I tried it in park, neutral, engine off and engine on. I tried driving 5-10 mph to relieve any driveline wind up, I tried driving in reverse with front hubs free and locked, gave the same results in AE and no transfer case shifting.
Section 308-07A Four Wheel Drive Systems Pinpoint Test I
Found a thread with some fuses to check, I have checked fuses #19, 27, 31, 33, 34, 45 and 111 (with a multimeter for continuity),
Relays (first swapping the old ones, then trying new ones), I did the pinpoints from test I, and installed another GEM (same part number as mine but from a 2005 F-350)
Section 308-07A Four Wheel Drive Systems Pinpoint Test I led to my purchase of a used GEM, not knowing if it is good or bad, I have determined that I get the exact same codes for each AE Scan as the GEM that came with my truck.
I included a photo of my relay box, have any of you seen this type before? There is no other box in the engine bay with twin relays.
Air/Defrost switch works and routes air to switch setting. AC works, DEFROST works.
Could PVHS be causing a code from the manual hubs?
Could the MSS be causing a code even if it is showing correct in AE?
Should I try a new TCSM? Should I try turning the TCSM manually? How do I test, what do I test for on the TCSM?
I want to avoid taking this to the dealer if their own service manual and diagnosis is going to have the same results as my testing.
Where do I go from here?
Could PVHS be causing a code from the manual hubs?
Could the MSS be causing a code even if it is showing correct in AE?
Should I try a new TCSM? Should I try turning the TCSM manually? How do I test, what do I test for on the TCSM?
Ford 6.7L Power Stroke Diesel :: Jerks When Shifting From 2 To 1 While Slowing Down
Trans has new solenoids in the trans but is shifting too firm sometimes from 1-2 or 2-3.. It is tolerable going up, but when slowing down it jerks really bad from 2-1. Sounds and feels horrible for the trans and miserable during stop and go traffic. Ive had to switch it to Manual and start off in 2nd gear. Im deleted, with intake, and a custom sct x4 tune. My main question is there any way a new tune could have better shift points?
View 14 RepliesFord 6.7L Power Stroke Diesel :: 2011 F350 - Clunk / Clank At Both Wheels Around The Brake Area
I have a 2011 F-350 CCSB 4x4 w/ 20" Wheels and the electronic locker. I have had for some time a noise when I go over small bumps (pulling into garage up a 1" lip) at slow speeds. It sounds/feels like side to side movement. I have traced this down to what sounds like looseness inside the rear differential. To recreate, I lay down and shove hard on the spare tire. This pushes the truck side to side. I can hear a clank/clunk at both wheels around the brake area.
View 14 RepliesToyota - Dolphin :: 1977 - Loud Clunk When Shifting Into Reverse Gear
Sometimes when putting the vehicle into first it's almost impossible to get it to go into gear. Sometimes it's super smooth. Also when putting into reverse we hear a loud clunk. That one is most of the time but sometimes it goes in smooth. I was doing some looking around at the pedals because I think I am going to have to replace my master cylinder and noticed that on the inside of the vehicle where the clutch master cylinder comes into the vehicle it's leaking black fluid. Does that automatically mean my clutch master cylinder needs to be changed? Could this be the cause of it being difficult to shift because the clutch isn't fully disengaging?
View 11 RepliesFord 6.7L Power Stroke Diesel :: Shifting Not Smooth From 3rd To 4th / Slight Hesitation
i bought a used 2011 F250 and really like the truck and there is no comparison when towing the trailer.
1.) I've noticed the truck doesn't shift smoothly from 3rd to 4th. Under light acceleration the RPMs climb, then drop slightly, then climb, and finally the truck shifts into 4th gear. It's almost like the truck wants to shift but doesn't. I believe a selenoid was replaced on the truck.
2.) From a dead stop, when pushing slightly on the gas pedal there is a slight hesitation or unresponsiveness with the truck wanting to proceed forward.
Ford 6.7L Power Stroke Diesel :: Manually Shifting 6R140 Transmission
I was reading yesterday where someone was wishing for a tuner that would allow you to skip 1st gear. I realized today that you can do that in Manual mode and was even surprised to find out that it would even let you start in 3rd. Driving around without a load, 1st gear does seem a bit of a nuisance. You can't really get on the throttle until you get 2nd! Playing around with it a bit, starting in 2nd, and even 3rd around town was really nice and I didn't miss the shifts. The other thing I noticed that when in manual, it will down shift based on speed, but not throttle position, so if you're going fast enough, it will maintain that gear without downshifting as you apply more throttle. I'm assuming that Ford put some thought into this and won't let you shift in a manner that will cause damage. It would be nice, however, if it would bypass 1st if not in Tow/Haul mode and not make you do the manual shift thing.
View 5 RepliesFord 6.7L Power Stroke Diesel :: 2011 - Transmission Won't Shifting Properly?
In my 2011 F-250, 6.7, auto....it seems that at certain times went the tranny shifts from 2nd to 3rd and I pause with acceleration, for some reason the tranny seems to go into a slip mode and then slams into 3rd. Now I read about 8 months ago that there was a computer upgrade via Ford. Which they did when I was having some work done on the truck at the dealership.
View 14 RepliesFord 6.7L Power Stroke Diesel :: F350 Shifting At Lower RPMs
Just bought 2 new F-350 with 6.7s for a service truck and feed truck. I have a 2011 6.7 so pretty familiar with it. I noticed both these new trucks shift at a lot lower RPMs. At times if going from pasture to pasture I have noticed the tach at 900 rpm in 6th gear. My 2011 doesn't do that, it shifts at a higher rpm. Both of the trucks have been deleted, and I have a SCTx4 tuner in each truck and have both tuned to the lowest setting, Tow 40HP. Is this a fuel economy thing?
View 5 RepliesFord 6.7L Power Stroke Diesel :: 2016 - Clunk Sound Happens When Go From Drive To Reverse Or Using Exhaust Brake When Towing?
What is the source of the sound? Listen for the clunk b/w 3 and 4 seconds. I just dropped off my 2016 Super Duty 6.7 CC LB 4x2 at the dealership. I'm afraid that they will say the sound is a characteristic but I never had the sound on my 2011 Super Duty 6.7 CC LB 4x4. This sound happens when I go from drive to reverse or when using the exhaust brake when towing. The sound does not exist when the transmission is cold only when it is fully hot. It will also make this noise when climbing a really steep hill in first gear with fiver and the torque converter needs to slip a little.
As far as I can tell all of the u joints are tight and the axial support is tight I only have 2000 miles on my truck.
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