Shudder In Drive Train - Diesel Forum -
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 5 (permalink) Old 11-13-2006, 12:48 PM Thread Starter
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Shudder In Drive Train

Hooked my truck up to a 30ft equipment trailer yesterday to move some round rolls of hay. Started down the road (empty) and noticed at about 45 to 50 the truck developed a very noticeable shudder. It would quit after about 55 until I would start up a grade and then it would come back. I just turned around and went back home because I didnt want to load the trailer with 8K to 10K of hay with the truck shuddering that way. Does anyone have any ideas as to what it might be?? My tranny has been acting up lately, slow going into reverse. Would this have anything to do with the shudder????? [img]/ubbthreads/images/graemlins/shrug.gif[/img]

Early 99 (4/98) F250 X-CAB 4x4,automatic tranny,DP Tuner 40HP tow PCM,Sonnax tranny kit,C-Betr mirrors, XM radio, Cobra CB,gooseneck hitch. 315,000 miles and counting!!!!!
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post #2 of 5 (permalink) Old 11-13-2006, 03:24 PM
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Re: Shudder In Drive Train

Could be the torque converter showing it's age. Has it been serviced or rebuilt in those 243K miles and counting?
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post #3 of 5 (permalink) Old 11-14-2006, 08:59 PM
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Re: Shudder In Drive Train

had same problem with ny 99. exact same speeds. i ended up buying a new torque converter(ford dealers answer to problem). this did not change a thing. then ford tells me to buy a new tranny, which i did. the new tranny came with a new torque converter also. this also did not change my problem. was then told by ford dealer that the shudder was just an annoyance more than anything and would not cause any further damage. I got around 1500 miles on new tranny and it died. I had to buy another tranny which still had shudder. got to thinking about the fact that new trannys did not come with any new sensors(old ones were used) went out and bought all three new sensors which included the input speed sensor, output speed sensor(on top of tranny, and transmission range sensor(on side of tranny). problem solved, no more shudder. surely it was only one of these sensors, but bought all three for about $125 which was cheaper than taking it to the dealer and then buying the one sensor that was bad. by the way, dont know why, but the service engine light never came on to signify this problem. that is why i did not expect electrical problems in the first place. hope this helps and saves you the expense i have incurred with a simple problem.
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post #4 of 5 (permalink) Old 11-14-2006, 10:04 PM
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Re: Shudder In Drive Train

Interesting, I am having the same issues, I thought it was the new power mods and still could be, but for 125 and change ill try it. Whereto buy and what are the part #s. Need to pull tranny for top sensor?
I also am experiencing sputtering when coming to a stop light, usually after high speeds

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post #5 of 5 (permalink) Old 11-15-2006, 08:26 AM
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Re: Shudder In Drive Train

My guess is the carrier bearing is shot. When you replace it, also replace all U-joints and get the driveshaft re-balanced. A shudder at take-off indicates a TC problem, but could also be a carrier bearing problem.

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