Shuddering 7.3
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Shuddering 7.3
2001 Excursion 4x4, 185,000 miles original automatic transmission and 7.3 engine. For a little while now, I would say the last year or so, I have noticed driving down the road or highway in fourth gear only, between 50 and 60 miles an hour there is a noticeable shudder coming from the drivetrain that you can feel all the way through to the steering wheel. this was very slight at first, thought maybe i just needed a wheel balanced or alighnment, but after a new set of tires and alighnment the problem is still there. Have checked u-joints and driveshaft for balance and are all fine.
Noting that this is only happening in fourth gear between 50 and 60 mph and the shuddering is getting more violant leads me to think maybe something with the transmission???? This truck is not a daily driver and may sit 4 to 5 days at a time before being driven, i guess thats how i can tell the problem is getting worse! Plan on taking it to a shop this week and getting it checked out, i guess i am just looking for a place to start. I could be completely wrong thinking it's the trans. Any input would be greatly appreciated, thanks in advance!
Noting that this is only happening in fourth gear between 50 and 60 mph and the shuddering is getting more violant leads me to think maybe something with the transmission???? This truck is not a daily driver and may sit 4 to 5 days at a time before being driven, i guess thats how i can tell the problem is getting worse! Plan on taking it to a shop this week and getting it checked out, i guess i am just looking for a place to start. I could be completely wrong thinking it's the trans. Any input would be greatly appreciated, thanks in advance!
Postmaster
Joined: Jan 2009
Posts: 2,667
Likes: 1
From: Glen Rose,Texas
Have you greased the slip joint on the driveshaft?If it is dry it will cause shudderring.Cheap/easy fix.Are the strap bolts at all u-joints tight?
You said you checked the u-joints,a small amount of slack or a dry joint may cause binding.
Slip joint regreasing
You said you checked the u-joints,a small amount of slack or a dry joint may cause binding.
Slip joint regreasing
Laughing Gas
Joined: Aug 2009
Posts: 1,192
Likes: 7
From: Belgrade, MT
The 3rd and 4th pictures in this link Slip joint regreasing show what you are after, it is an easy fix, just be sure to chock your wheels before starting.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
2001 Excursion 4x4, 185,000 miles original automatic transmission and 7.3 engine. For a little while now, I would say the last year or so, I have noticed driving down the road or highway in fourth gear only, between 50 and 60 miles an hour there is a noticeable shudder coming from the drivetrain that you can feel all the way through to the steering wheel. this was very slight at first, thought maybe i just needed a wheel balanced or alighnment, but after a new set of tires and alighnment the problem is still there. Have checked u-joints and driveshaft for balance and are all fine.
Noting that this is only happening in fourth gear between 50 and 60 mph and the shuddering is getting more violant leads me to think maybe something with the transmission???? This truck is not a daily driver and may sit 4 to 5 days at a time before being driven, i guess thats how i can tell the problem is getting worse! Plan on taking it to a shop this week and getting it checked out, i guess i am just looking for a place to start. I could be completely wrong thinking it's the trans. Any input would be greatly appreciated, thanks in advance!
Noting that this is only happening in fourth gear between 50 and 60 mph and the shuddering is getting more violant leads me to think maybe something with the transmission???? This truck is not a daily driver and may sit 4 to 5 days at a time before being driven, i guess thats how i can tell the problem is getting worse! Plan on taking it to a shop this week and getting it checked out, i guess i am just looking for a place to start. I could be completely wrong thinking it's the trans. Any input would be greatly appreciated, thanks in advance!
How is your mileage? Any SES light by any chance?
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JMathews
To JMathews the answer to your question is "yes" the truck is lifted. Tough Country 3.5 Kit, springs in front, blocks in rear, dual shocks up front, dual stabalizers. Rear driveshaft was lengthened and balanced.
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Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Your symptoms point to a bad injector. A buzz test might give a clue as to which one. Is there anyone in your area who has AE or good scanner?
