Ford 7.3L Power Stroke (1999-2003) :: F350 - Front Tires Cupping / Bouncing Down The Road
May 17, 2015
I have been "fighting" a front tire cupping problem on my L99 F350 Dually 2wd since I have owned it.
I got LOTS of paperwork with it, one of which was a service ticket from the dealer where it was bought new (with VERY low miles on it) saying several passing motorists had informed them that the front tires were bouncing down the road.
I have read this service complaint several times and I now feel that has something to do with it. I bought the truck with 70k on it some 8 years ago-the PO had installed EXPENSIVE Michelin XPS Rib steering tires on it and they were already destroyed by cupping.
I replaced all 4 shocks, and all 6 tires, begged the folks to FIND something wrong/loose/worn out on the front suspension/steering and they found nothing, they aligned it. THAT set of Cooper Discoverer HT tires did exactly the same thing, except I spent a lot of $$ having the tires rotated.
Now I have a set of Firestone TransForce tires on it and its been to a HD truck shop where I begged them to rip into the front end and FIND something wrong-THEY DIDN'T. THEY installed camber bolts and aligned it, yep, you guessed it STILL CUPPING!!
So, now I'm thinking is it possible that the wrong coil springs were installed at the factory causing this bouncing that the original owner reported to the dealer? I have now destroyed 2 more tires and getting tired of it.
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About two weeks ago my front tires started rubbing. I've been running the same size tires as long as I've owned this truck, and the PO ran the same size too. The rub is more noticeable when turning up an incline, but I've heard/felt the run on flat ground too. What would cause this "out of the blue"? Are my springs wearing out? FYI...I replaced the shocks less than a year ago, and bought the tires in March.
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I had my car drop for a while now on megan ez coilover. Before I bought my new set of wheels, I drove the car with the OEM wheels and they never had any cupping issues. Then after I bought my AME Shallen with 20mm hub centric H&R spacers on Nankang NS, and then they started cupping on the front inside tires after 5000 miles. I had the alignment done and only had the toe adjusted.(don't have camber kit) At first i thought it was the spacers causing the issue, but then I bought Orden's with new Nankang NS and had the toe adjusted to spec's again. Camber is at -3 BTW. Recently i started hearing the same road noise so I inspected the tires and found it was cupping in the front again! I also checked the front end of any damage or worn out bushing and couldn't find any signs of damage. I always keep my tires at 40psi, torque them down evenly, and I'm using hub centric rings. My questions is do you think is the Nankang tires or do I have a suspension problem?
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Now down to the question in hand. I have a 2001 f350 4x4 with7.3 diesel...I have recently noticed a low grind like noise coming from the right front. I have troubled shot the issue and I am 100% sure it is the wheel hub assembly. Did I mention I am running 37x13.50 tires..and now it is the hubs...and they are the original hubs.. My question is every thing I look for shows ABS is on my truck... I look at the hub and don't see it.. so with the Dana 60 front does it have ABS or not? Also, should I go motorcraft, Timken or moog wheel hubs?
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2002 e350 7.3 diesel transmission... At 7 miles the speedo began bouncing and truck drops into second. Parked it 30 minutes, stated up no problem until 8 miles and the it started again. Have checked most of the electrical, changed speed sensor and transmission position sensor. Only error code 2-3 rd gear mismatch.
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I was out with the F350, drw, automatic, 7.3, 4 x 4, yesterday about 30 miles from home base. The transmission started pumping fluid out the front like I have never seen before. I am not talking a drip, I am talking a stream, a big one..... almost like pouring coffee from a coffee pot. I noticed it when I was backing into unload and was leaving an oil trail, a quite obvious one.
We took off the tc cover as it was coming off that to find a dry tc and flywheel, but fluid running out off the case. This is the second time this trans left me high and dry in 165k miles. The first time was a stripped tc/ input shaft. We repaired the transmission then but I don't think we replaced much besides being sure no debris went though everything, fixed what was broken. That was about 25,000 miles ago.
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Ok after rebuilding trans and being down a couple of weeks, I went on my 1st run since completing. Noticed when I started truck this morning it didn't turn over as fast as it was. 30 miles down the road Airbag Light comes on, and then volt meter dropped to 8 volts. Got stopped with truck still idling checked everything I had the tools to do so for. Decided to get back to my shop where I had tools, and 5 more miles and 55 mph truck just shuts off. Lost all power, truck would only click. Put my booster box on battery and gauges went back to normal but still wouldn't turn over but maybe once? Only place within a mile of my location was Walmart. Bought 2 new group 65 batteries, installed them and Shazam cranked right up no more problems. Short of the story bad batteries that checked Good with a load tester don't mean squat!
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The issue: when I reach 37-40mph I have a new sound which I believe is the transmission 4R100. It sounds like a flat spot on a tire, or the sound tires make when they leave the sticker on them. The cadence of the sound is slower than the rotation of the wheels.
If I let off the accelerator, the sound stops, as soon as I add load by pressing the accelerator the sound returns. If I shift to Neutral the sound is gone.
If I coast at any speed the sound is gone. It is only audible when under load at speeds above 37-40 mph. The cadence does increase as I speed up, but it doesn't sound as fast as the motor is turning (~1900 rpm's).
I monitor the truck with torque pro using the PIDs defined here on FTE. I can see lock-up in 3rd and the shift to overdrive. When in lock-up, I see 1-7rpm TCSlip.
Watching transmission temp as reported by torque, the hottest I see is 183* pulling an enclosed 6x12 @ 75 mph. Ambient temp is 95*. Excursion currently has 240k miles on the clock.
This sound was first heard by my wife two weeks ago. I thought I had tire issues and they needed to be rotated. The sound is still present, and now identified only when the truck is in drive, and under load, regardless of me pulling a trailer.
Yesterday on my 500 mile trip, the truck hiccuped several times which I believe was around the time I was either moving in or out of overdrive. Details in a different thread: [URL] .....
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My transfer case engages the front drive shaft spins but even when I manually lock my hubs neither of my tires will pull! I was thinking either the hubs are shot but I was told it could be the 4wd locking solenoid??
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Going down road truck just died replaced fuel filters still wouldn't start no codes check all fuses and made sure the FICM was plugged in....
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A little about my truck. E99 F-350 crew cab long bed dually 4x4 223K miles. 4.10 gears with LS in rear.
I bought the truck June 2016. I ended up wrecking the truck on the test drive. Thought it was a 4 way stop and pulled out in front of a lady and she ran into the passenger side tire. Only damage that was on the truck was a busted tire, and the fender smashed in. Some how missed the door and the bumper.
I replaced all the front end: u-joints, ball joints, steering linkage, brakes, rotors, calipers, and all the u-joints in both of the drive shafts, also changed the fluid in both axles.
I have started to notice a slight "vibration" "shimmy" while driving down the road. Mainly while in a curve or changing lanes; applying pressure to the steering wheel one or the other. Tires have been balanced, and rotated several different times now with no luck at all.
While backing up, I can feel something "popping" "clunking" especially while turning. Like backing out of a parking space.
Insert troubleshooting:
Jack truck up and put on jack stands.
- Pull and shake all tires. --No movement
- Put in drive and watch all the rear end. --Nothing shaking or out of sync.
- Put truck in 4wd, hard to engage, watch front end. --Nothing shaking or out of sync.
- Turn tires to full lock. --Drive line starts clanking and shaking and rear tires acting funny.
- Turn tires straight. --Problem goes away.
- Put truck back in 2wd. --No problems when turning wheel lock to lock.
- Drive to empty parking lot. --Mainly feel problem while backing up, really have to feel for it. Most people call me insane.
- Lock the front axle. --No difference.
- Put in 4wd. Drive straight --No difference.
- In 4wd while turning. --Truck wants to act like it is fully locked in the rear and will bind up and slip a tire. You really have to give it some fuel to make it even try to move, and its almost like the truck wants to fold in half on itself. Cant keep the steering wheel in one spot as it keeps "jumping" on me.
- Put in 2wd. --Acts the same way until the truck fully comes out of 4wd then smooths back out to where you have to really feel for it. 4wd light stays on forever, before going off later in life.
- Put in 4low. --Gears grind and will not engage.
Would this indicate that the transfer case is messing up on me? Why would the rear axle feel like it is locked when in 4wd?
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