Ford Super Duty (1999-2016) :: 2008 F250 - H&S Tranny Rev Up While Accelerating - Slipping?


Sep 14, 2013

I have a older minimax with the latest updates and have noticed that under full acceleration the tranny seems to rev up faster than the truck is accelerating. This occurs i think in 3rd gear like accelerating onto a on ramp etc. Kinda like its slipping if you know what I mean. I'm running the mild tunes in tow mode. Everything else seems ok.

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Ford Super Duty (1999-2016) :: 2011 F250 Loses Power And Tranny Is Slipping

Heard a 2011 F250 gaser while driving in the morning just falls flat on its face, almost like its starving for fuel as well as it feels like the tranny is slipping too. What this could be? I am not sure if its electrical or what.

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Ford Super Duty (1999-2016) :: 2008 F250 Transmission Slipping When Doing 55 MPH

I been having a issue with my truck lately. It's a 2008 with only 88,000 miles. When doing 55mph it feels like the transmission is slipping. Sometimes it will do it over and over. If I speed up to about 60mph it goes away.its has gotten worse in the last month or so. Hoping it's nothing major.

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Ford Super Duty (1999-2016) :: 2006 - Tranny Slipping While Towing Uphill

'06 Power Stroke/136k miles.

This last weekend I was towing my rzr up hill and the tranny slipped, lost power, and the "Wrench" check eng came on. I pulled over, checked my fluids, checked for leaks, checked for smells, couldn't see anything visibly wrong.

Turned it back on and no other issues on the way to the camp site. On the way home, days later, same thing happened twice. Is the tranny going bye bye? Would it be worth it to get a flush for the possibility it just may be the fluid and maybe some sediments or something of the sort?

AND the bigger question is, if it is the tranny, should I trade this POS in, or replace the tranny? It has had a few problems lately with the turbo. Needs a new AC compressor. I didn't do much homework or know about the 6.0's before I bought this truck. After I bought this truck last year I heard about all the problems the 6.0's have and wished I would have went another route.

I can turn a wrench pretty decent (Aircraft Mechanic) but I have very little knowledge on vehicles, let alone this POS. I am apprehensive about doing a transmission or any big components without assistance. This is why I am trying to decide what the best option would be for the long run.

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Ford Super Duty (1999-2016) :: 2008 F250 - Vibration When Accelerating From A Stop And Under Load

My F250 6.4, 3.73 Crew Cab Short bed vibrates when accelerating from a stop with my 5th wheel on. The 5th wheel weighs 12K. It is a medium to high frequency vibration that is felt throughout the entire truck. It continues through the shift into 2nd (TorqueShift Tranny). The harder you accelerate the more you feel it.

It does not occur if truck is unloaded and you accelerate at full throttle. Is this normal or should I get it looked at?

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Ford Super Duty (1999-2016) :: 2001 F250 - Tranny Started Overheated

So out of nowhere, my tranny started over heating. Got up to 210. It usually runs in the 140-150 range. I have the 6.0 cooler, and 7500 miles on the synthetic fluid. My cooler lines to the radiator were ice cold. I crimped my bypass and this seemed to fix it a little (I know this is a no no), I did the flow test before driving it and it passed. It seems to heat up the most at stop lights in gear. It drives fine, no slipping, no chattering. I also dropped the pan, had some stuff on the magnet, replaced the filter too. It doesn't seem to heat up as bad now, goes to about 190. I will install the new bypass tomorrow when it comes in from the ford dealer. Whats causing the heat? BTW truck has a 4" lift with 35's no other mods.

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Ford Super Duty (1999-2016) :: F250 - Transmission Fluid Is Low / Slipping

1999 F250 SD... Tranny fluid is low, tranny slipped one time on me. I checked the fluid and it's low. No drips on the garage floor, so I'll have to inspect closer. But my question is can I add new fluid without screwing it up even more? It's got 170,000 miles and I doubt the fluid has ever been changed. I just bought the truck last week, so I can't say for sure, but it hasn't had a regular flush or change. It doesn't smell burnt but it's just a little darker than new fluid. I was told by the guy I bought it from that the torque converter was changed in it not too long ago.

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Ford Super Duty (1999-2016) :: 2009 F250 6.4L - Stuck In 3rd Gear - Got Tranny Codes?

I have an intermittent problem with my 09 F250 Diesel. A few times now under hard acceleration I have had the trans seemingly get stuck in 3rd gear. The little service required wrench symbol showed up on info screen but after shutting off the engine no codes were present. A week or 2 later this happened again and I ran diagnostics through my Spartan tuner and got P0771 and P2704 for codes.

Again they cleared when I shut the engine off. Since this is an intermittent problem, only after hard acceleration, would it make sense to change tranny fluid, maybe do a tranny flush? Or am I off to the dealership for a rebuild?

2009 F250 Lariat Crew Cab Short Box
Spartan DashDaq
S&B Cold Air Intake
4" Flange-back w/6" Can
Package by Dirty Diesel Customs-Red Deer Alberta

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Ford Super Duty (1999-2016) :: 2011 F250 - Transmission Slipping For A Second When Accelerate

2011 f250 gas 4x4... I bought last year with 65k miles, now has 105k. sometimes when accelerating it slips for a second like a manual would if you jabbed the clutch while pulling. I had the 100k trans flush done. I noticed it a couple times before but more frequent recently. How concerned should i be?

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Ford Super Duty (1999-2016) :: 2005 F250 - Transmission Slipping Going Uphill

I bought my F-250 Super Duty 6.0 last October, and I am extremely happy with it comparing to my former '03 Dodge 2500 TD. The Ford drives so much better!

There is only one problem I have with it. Without pulling it shifts nice and has lots of power. A Month ago I bought a fifth wheel trailer and I hardly notice it behind the truck, also it doesn't use more diesel pulling. However going uphill the transmission seems to slip, and I can hear (sounds like) a fan running loud? I loose speed.

All the temperature gauges stay normal, no difference. It starts to pull worse. I replaced de tranny filters, inside and the outside one. Also I did put the correct transmission fluid in there, no difference. Almost no grindings in the oilpan/magnet.

I looked on many sites, but cannot find anything on this. Personally I think it's the torque converter? My final step would be to have the transmission rebuild, with the best parts available, (close to WA, ID, MO)...

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Ford Super Duty (1999-2016) :: 1990 F250 E4OD Tranny Would Seemingly Go Into Neutral While On Freeway

I have a 1990 F250 with a 7.5 liter and an E4OD. It starting acting up a couple months ago. Tranny would seemingly go into neutral while on freeway. I figured trans was going out... After reading several threads I've decided to try changing the mlps first, got a new one at the dealer!!!. It is the updated one with the connector on the top. I'm currently waiting on a new pigtail from autozone (the original is in bad shape, wires frayed, insulation missing. Also I think when it started having issues we were having some serious rains, which may have caused this connect to get wet.

I believe a previous owner may have had the trans rebuilt at some point. The connect has 6 wires going in it and when I trace those wires back, two are spliced into one farther up the harness a bit. Looks like one is tied into a wire that goes to the solenoid harness. I'm hoping I can cut and splice the 6 wires into the new pigtail and be good.

For now, while I was under there I decided to pull the solenoid plug as instructed to make access to mlps plug easier... the lock is on the backside almost impossible to get to, I messed the plug up all the way around, but not fubarred. When I pulled the plug out, it was soaked in transmission fluid... Is that normal?

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Ford Super Duty (1999-2016) :: 2015 F250 - Cold Tranny Noise / High Rev Sound When Accelerate

Just bought my first Ford. Its a 2015 F250 Platinum. Im at 1400 miles and Im becoming concerned because when I start the truck for the first time in the day, no matter how long I let it sit and warm up I am noticing that on the first couple of miles of driving I hear a high revving sound as I accelerate and it seems to quick shift during those first few miles.

As I continue to drive the high rev sound just fades away and all engine sounds and shifting are as normal as can be and will remain that way until the truck has been sitting for an extended period of time and is cold. I thought it had something to do with tranny temp but this morning I let the tranny warm up to about 115 deg in neutral before taking off but still had the high rev for the first few miles. I have never owned a ford nor have I ever owned a heavy duty truck, hoping this is normal.

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Ford Super Duty (1999-2016) :: F250 - A/C Goes From Defrost When Accelerating?

I have a 1999 F 250. When I accelerate my AC from the vents changes to the defrost. Other than that it works great and is ice cold. Why it's doing this.

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Ford Super Duty (1999-2016) :: 2001 F250 - Trans Slipping Accompanied By A Sound Like Hitting A Rev Limiter

I have a 2001 F250 SD 4x4 5.4L . I purchased the truck used with about 120,000 miles on it. It runs great despite averaging about 10.8 mpg. Shortly after I got the truck, I noticed what I thought was an intermittent transmission issue when the trans would shift. I would get a "flare" that lasted briefly as if the trans was slipping, but it was accompanied by a sound that I'm not sure how to describe, but it was somewhat like hitting a rev limiter. It only happened when the transmission shifted. The fluid was clean and did not smell burnt. I assumed it was a misfire issue, even though it did not happen often, and seemed to only happen at shift points. I changed all of the plugs and all of the coil packs. It still does the exact same thing. Sometimes it only does it once every couple of days, and other times it may do it 3 or 4 times a day.

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Ford Super Duty (1999-2016) :: 2002 F250 V8 - Whistle Noise When Accelerating

2002 F250 V8 Gas 4x4 210 000kms

Just the other day noticed a whistle noise or a whining noise while I'm accelerating. Sounds like its coming from from the front passenger side,not sure.

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Ford Super Duty (1999-2016) :: 2015 F250 - Hissing Or Whistling Noise While Accelerating

I have a 2015 ford f250 xlt crew cab, 6.2, fx4 with about 1200 miles on it. My questions are, I have noticed a hissing or whistling noise while accelerating. I took to dealer and was told it was the throttle plates not closing all the way.I was told they all do this. Normal? Very annoying noise with windows down. Another noise I have been having is the brake pedal makes a popping noise while applying pressure to brakes. Dealer said brake pedal assembly was out of alignment. They said was out of alignment 1/8". After adjustment within a few days popping started again.

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Ford Super Duty (1999-2016) :: 2015 F250 - Whistling Or Hissing Sound While Accelerating?

Have a Whistling or hissing sound while accelerating? My 2015 6.2 seems to make this sound while under load. I took to dealer and they claim its the throttle plates not closing all the way. Claims this is normal, but to me it is annoying. Just would like to know what others think.

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Ford Super Duty (1999-2016) :: 2011 F250 - Fan Is Making A Loud Sound As The Motor Is Accelerating

Picked up a new to me 2011 F250 Lariat. She had a few odds and ends to take care of, but I was ok with that. So far I fixed the reverse sensors (2 were out) creaking in the back (leaf spring bushings needed a little Lithium Grease) Squeak in the back (tailgate step needed a little greasing). Now on to my next problem!

This is my first 6.2l (first f250 in general). Truck starts up great and idles quite. Taking off driving, it sounds loud as hell under the hood. To me it sounds like the Fan is making a loud sound as the motor is accelerating. It is more noticeable when you really floor it. Prior to this I owned a 2010 F150 and I know stomping on it the motor really revs up, but this other sound to me isn't right/normal. Googling around, the closest I found to it was:

Loud "Air" Sound Upon Accelerating 2002 FORD EXPEDITION - fan clutch! - YouTube

Granted it's for an expedition, but the sound is damn near identical. Looking on youtube at 1 or 2 videos of a f250 doing a 0-60 all I heard was the sound of the motor revving, so that has me convinced the sound I'm hearing is not normal. I'm 99% convinced it has to be the fan clutch.

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Ford Super Duty (1999-2016) :: 2007 F250 - Shimmy When Accelerating From A Stop / Turning Right Or Left

2007 F250 SD Crew Cab Long Bed 4X4 with 6.0. Bulletproofed, leveling springs, 5k firestone airbags, upgraded brakes, new front driveshaft and new universals and carrier bearing on rear u joint.

The issue: When accelerating from a stop or a slow rolling start, turning right or left, I get a shimmy (vibration) that seems to be coming from under my feet. Not a violent shimmy, but enough to make me certain that something is loose or out of alignment in the drivetrain. IT IS NOT THE REAR END as friends have constantly told me. Rear end was serviced and cluth packs lubricated with no change in issue.

What I've done: Changed transfer case fluid, new front driveshaft, new u joints and carrier bearing on rear driveshaft. There has been no improvement after these repairs, if anything the vibration is a little worse and easier to induce.

I've been chasing this problem for over a year. Going to be pulling a Toy Hauler out west this falls and really need to repair this for my piece of mind..

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Ford Super Duty (1999-2016) :: 2008 F250 Wants To Go Into 4wd All By Itself

Seems recently my 2008 f250 diesel wants to go into 4wd all by itself. It's the electric switch on dash with the auto/lock front hubs. I'm thinking either the dash switch or the accuator motor. Where to start though... Also I can turn the switch to 4 wheel high and it doesn't go in.

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Ford Super Duty (1999-2016) :: 2008 F250 XL - No Aux Audio

So my dad just bought a 2008 f250 xl with a single cd head unit and mp3 hookup. When you press the aux button on the head unit, it displays ' no aux audio". We have tried unplugging the radio and plugging it back in for a few minutes, but that has not worked .. Any way to get the aux input to work?

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