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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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Shudder!

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  #1  
Old 02-06-2018, 08:50 PM
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Obs7.3Powerstroker
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Shudder!

My 1996 f350 7.3 has developed a shudder. It only happens at 40-45 mph and only when cruising at that speed if you are accelerating you can barely feel it and it goes away and never comes back, even up to 75 mph. Could this possibly be from a bad u joint. The truck did have some pretty bad axle wrap which can tear up u joints. So I’m wondering if that is my problem.
 
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Old 02-06-2018, 10:37 PM
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If it is an automatic transmission, it could be torque converter shudder
 
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Old 02-07-2018, 08:32 AM
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Could be. I hope not. It has a new a billet torque converter with only about 10xxx miles.
 
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Old 02-07-2018, 08:39 AM
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Check transmission yoke for slop. If a slip joint, it could be worn and causing issues.

My '95 F150 has same deal right now, 35 mph it pulses a real bad vibration through the whole truck. I grabbed the slip yoke and it actually "Clunks" on the shaft. You can feel the vibration randomly all the way up to highway speed. Just slow speed is worse.

I picking up a new yoke tonight and installing it.
 
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Old 02-07-2018, 02:49 PM
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Definitely will check that out. Let me know if it fixes yours.
 
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