I have a 24 CC 4wd 6,7 C and C F550.

I am not a hotshot guy but took a 600 mile trip today (light hills) starting with 500 miles on the truck and ending with the odometer around 1100 miles.

Truck, bed, trailer scaled at 22,500. Had about 22,000 on the deck for a total of 44,500.

The last diesel I owned was a 6.0 with multiple 7.3 prior so I have not had a PSD for a lot of years.

I noticed the below issues and wanted to see if they are normal or if others have experienced this.

1. there is a tick in the exhaust under the passenger rear door. It sounds like a lifter tick, but seems to be coming from some part of the exhaust.
2. acceleration from a stop a pretty good shimmy on the 1-2 and 2-3 upshifts. Not crisp and clean but a lot of shaking for a few seconds. Trans temps were in the 220 plus.
3, turbo started sounding different around 1100 miles. Heard it spooling, but also heard what sounded like a hissing from a different location than the spooling when the dash showed around 20 psi of boost on up to 30 or so. Maybe a boost leak? My mind goes back to the plastic 6.0 boost pipes and the broken down Y pipes but a different sound for sure.

lastly the exhaust brake was on for the trip and not in auto.

Not trying to pick the thing apart, but want to know if this is normal or needs to get looked at.

 

That's a pretty decent load, any idea what your pin weight is?

Number one is pretty common, the tick is considered normal. What you're most likely hearing is the def injector cycle. Went up against the building. Say going through a drive-thru you will hear it really loud.

Number two can be considered somewhat normal also. I believe what you are experiencing is Axel wrap. I will experience this occasionally when my pin weight over 7,500 lb.

You're trying to get a whole lot of mass moving at once. There is solutions like traction bars out on the market to help resolve that issue.

As far as number three, the turbo and engine will sound different at times depending on the EGR cycle. If you experience a power loss at that weight, you'll notice it very quickly.

Never hurts. Double check all the boots, especially the clamps.

 

Did not weigh loaded but a 2100 pound knapehide goose neck bed on a 84” CA with no tools and a 40’ hydraulic tilt 2 axle flat bed trailer gave me the below. Thinking pin weight was almost 3k unloaded. (A little off on my 22,5K mentioned above as it was late when typing)

Think you nailed the Def injector

and yeah maybe the sound was the EGR. I could see this making total sense.

thank you!

 

I've never noticed a "shudder" when I'm towing my Sno-cat, but then again, I'm only at 24,690 GCVW, truck itself sits at 14,500#'s on a daily... mine's a 2022/CC/6.7/4x, also a 203"wb/84"ca truck, never noticed the "tick", I'll have to pay attn now and see if I notice it, coming from a 2015 Cummins 3500, it is noticeably quieter so it probably doesn't stick out to me. Heaviest I've towed so far has been ~18k deadblock trailer, non-GN, didn't notice anything different from towing my cat except a tad slower up to speed.

The EB seems to get better after about 5-6k miles, or maybe it was me learning to keep the R's up when towing in the mtns...

 

Could the shudder be that its confused, and between gears? Does it do it if you hold the accerator perfectly still while accelerating? Happen in tow mode and normal?

My Ram would go dead, no power at all, every once in a while because it couldnt make up its mind to upshift or downshift. "Dead pedal"

 

was in tow mode, but did not go to normal mode to see if that was an issue. All honesty I did not realize there was a tow mode until I had to shift in 4WD half way into the trip to make it through some soft dirt and hit the wrong ****.


will try the pedal in one position. The times it did it was on a slight incline and rolled into the throttle about half way but did not really want to go so had to go about 3/4 to get some momentum.

 

Sounds kinda like axle wrap, torque limiter map, and maybe traction control all coming together in a storm of tolerance stacking.

But axle wrap, when your rear spring pack is a foot thick? Not likely. Id have to drive it.

 

My 2017 for example. If you were stopped on an upward climb, from a standstill I would get a shutter from time to time, if I was face downhill, I would not get a shutter.

Trying to get 55,000 lb moving......

My 24, had the load deflection package, basically the 2-in block. Once I remove that and lowered the truck, it was much happier.

Op, do you know if you have the load deflection package? Basically it's a 2-in block, with a shim between the leaf pack and the axle.

 

Question... do the 23+ trucks have the Deep sand/Snow mode? I run my '22 in this mode all the time, it turns off TC and is a little "peppier" off the line, would be interesting to know the programming, but it does seem more.. aggressive than TH mode.

 

I am not at the truck but yes I think I remember seeing a wet road or mud and snow mode.

 

My documents don’t show having the block.

will look when I am back with the truck tomorrow.

 

During the break-in period they do funny things... Of course its your truck, but in the Ford owners manual ford recommend a few things noted below during the first 1k miles. The shudder on take off is helped by getting the pinion angle back to where it should be.. Air bags or some kind of helper should do the trick. That, or get some weight off the rear truck axle. Over time that shudder, if its what I think it is, will damage the driveshaft.. You may be doing this but also dont forget to use the exhaust brake beside the tow-haul mode.
Also recommend to do an oil change now.. Leave the filter though.

Driving Hints - Breaking-In

Breaking-In


Your vehicle requires a break-in period. For the first 1,000 mi (1,600 km), avoid driving at high speeds, heavy braking, aggressive shifting or using your vehicle to tow. During this time, your vehicle may exhibit some unusual driving characteristics.

 

I was waiting for that one.....

After having hundreds of brand new vehicles over the last 30 years in the fleet, while years ago that used to have some factual merit to it, nobody does that anymore. That picture I showed earlier, it was a 2017 f550, the day I picked it up I drove across town and picked up two gooseneck double stacked trailers and drove to the east coast from Texas. At truck had 450,000miles on it before I even retired it

If it wasn't leaking so much oil, I would have kept it

My buddy has it, deleted it and is still rolling around in it.

My rollback, the bed weighs 9,000 lb, You think the Ford dealer broke it in before they put the bed on, not.

Next somebody's going to tell me to lock my front differential in for a thousand miles so I can break it in

 

All Good. To each there own.... You are correct the dealer did not likely break-in the engine before installing the bed. They dont want it to last. They want you to buy a new truck at 450k or sooner, instead of getting 1 million miles out of it. What causes oil leaks on diesel is blow-by. What causes blow-by is going to long between services, low quality filters, low quality oil, and not following the brake-in period steps on a new engine, or a combo of all of the above.. The below video goes into the science of it all, in probably more detail then most people want to know. Except for us Diesel geeks of course.

 

Oh boy, think I'm arguing with an AI bot.

The weight I run, at 50,000 lb, for a vast majority of the truck life, the wear and tear is probably triple what the average truck will see.

You have no idea of the intense heat load that is put on an engine now when it is stressed for hours on end, the heat cool cycles takes a toll on the engine. Tolerances open up, seals dry up, etc.

Original motor, transmission, rear end, DPF 100% original. That is unheard of unless you're doing religious proper maintenance.

Hell I only had two sets of brakes ever put on the truck, in oil is religiously changed it's 7,500. My entire Fleet is that way. We used to do $200,000 MI, then get rid of the truck because of body, usually runs. Obviously it was a 2017 and it didn't rust, the bed did.

Besides some oil leaks, by larger concern was the shape of the bed and hauling a gooseneck that weighs 40,000 lb. It was deteriorating to the point where I didn't feel it was safe, it's still past DOT Inspection, but I wasn't dumping $10,000 to replace the bed on a truck with that many miles.

Go back to googling.

Look at AT&T, Verizon, your gas company, your water company, etc. you think these vehicles get driven around unloaded for a thousand miles before service bed is put on, before the cranes are put on, before anything is done,

No.