transmission issue
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Joined: Dec 2004
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From: South Weber, Utah
Do you have any gauges that read live data, like the scan gauge II or one of the smartphone apps like dashboss for IOS devices or torque pro for android? Have you had it scanned for DTC's? Also what year is your truck? And I do not believe it is a transmission problem.
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Both the shortbed and longbed exhibited bouncing or "bucking" from either improper pinion alignment in the short beds or carrier bearing in the long beds.
If it's only when cold, that's injector stiction which rears it's ugly head when the tranny goes into overdrive at about 45 mph.
Josh
Both the shortbed and longbed exhibited bouncing or "bucking" from either improper pinion alignment in the short beds or carrier bearing in the long beds.
If it's only when cold, that's injector stiction which rears it's ugly head when the tranny goes into overdrive at about 45 mph.
Josh
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From: Greenville, SC
Mine has always done this. 1200RPM / 45-46 MPH shudder in overdrive.
It's not an injector issue on my truck. There's a TSB about swapping rear axle spacers to help with the issue.
To clarify what mine does: If I accelerate thru this area to a higher RPM/MPH, everything is smooth. Under steady driving conditions, as I ease up to 45-46 MPH it'll shudder. If I just speed up a bit beyond this, it smooths out.
It just seems to hit resonance at this speed. If I put it on tow/haul, I can still feel it in a lower gear when I get to that speed. I can also pop it into neutral and coast, and it'll do it as I coast thru the 45MPH area.
Shudder on Acceleration:
On trucks with single driveshafts, check the rear axle spacers. If the spacers are installed with the thin
side (1 7/8") facing forward, they should be reversed (swapped left to right) so the wide side (2 1/4")
faces forward. If the truck now only shudders with a load, swap out the spacers with 2" flat ones from an
F250 long wheel base (two-piece driveshaft), P/N 2C3Z-5598-PA.
99-07 Super Duty F-Series Two-Piece Driveshaft Shudder:
Some trucks may exhibit a vibration on moderate to heavy acceleration from a stop. This is usually due
to too high of an angle through the center u-joint. The correct angle through the u-joint should be 0.5-3.0
degrees (compare front shaft angle to rear shaft). Check the engineering number of the center bearing
bracket to ensure it is the correct application, and replace if necessary. If the bracket is correct, the
shudder may be corrected by shimming the bearing down from the bracket using up to three 1/4" shims,
part number E0TZ-4A209-A and two grade eight bolts long enough to expose three threads above the
nut when tightened to 46 ft/lbs. Loctite is recommended. Broadcast Message 0518, 1475; TSB 04-22-7,
05-17-6, 06-23-4
It's not an injector issue on my truck. There's a TSB about swapping rear axle spacers to help with the issue.
To clarify what mine does: If I accelerate thru this area to a higher RPM/MPH, everything is smooth. Under steady driving conditions, as I ease up to 45-46 MPH it'll shudder. If I just speed up a bit beyond this, it smooths out.
It just seems to hit resonance at this speed. If I put it on tow/haul, I can still feel it in a lower gear when I get to that speed. I can also pop it into neutral and coast, and it'll do it as I coast thru the 45MPH area.
Shudder on Acceleration:
On trucks with single driveshafts, check the rear axle spacers. If the spacers are installed with the thin
side (1 7/8") facing forward, they should be reversed (swapped left to right) so the wide side (2 1/4")
faces forward. If the truck now only shudders with a load, swap out the spacers with 2" flat ones from an
F250 long wheel base (two-piece driveshaft), P/N 2C3Z-5598-PA.
99-07 Super Duty F-Series Two-Piece Driveshaft Shudder:
Some trucks may exhibit a vibration on moderate to heavy acceleration from a stop. This is usually due
to too high of an angle through the center u-joint. The correct angle through the u-joint should be 0.5-3.0
degrees (compare front shaft angle to rear shaft). Check the engineering number of the center bearing
bracket to ensure it is the correct application, and replace if necessary. If the bracket is correct, the
shudder may be corrected by shimming the bearing down from the bracket using up to three 1/4" shims,
part number E0TZ-4A209-A and two grade eight bolts long enough to expose three threads above the
nut when tightened to 46 ft/lbs. Loctite is recommended. Broadcast Message 0518, 1475; TSB 04-22-7,
05-17-6, 06-23-4
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Freshman User
Joined: Jun 2010
Posts: 26
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From: Tyler TX
Was told by Tyler Fuel Injection that the PCM is going out. I'm not convinced so will let it ride for a while. Scanguage shows good voltage on FICM and no codes. Thanks for all the suggesstions!
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
It's NOT the PCM. You need to get something that will scan for the transmission codes, but it's most likely injector stiction.
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