Vibration, bad flywheel?
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Tuned
Joined: Dec 2020
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Vibration, bad flywheel?
I have a 1999.5 F250 super duty with the ZF6 manual. It has a newly remanufactured transmission, rebuilt, driveshaft, rebuilt rear end all within the last 20,000 miles I am still having an issue with a vibration upon takeoff most noticeable in low first second gear, I am running out of parts to change in the driveline. I am thinking the only thing left is a flywheel issue looking for opinions and other people that have had flywheel problems to chime in.
Tuned
Joined: Apr 2004
Posts: 428
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From: Aroostook County, Maine
A flywheel issue would likely be felt in the pedal as you are engaging the clutch. Another other thing would be the center bearing support on the driveshaft if you have an extended or crew cab.
Logistics Pro
Joined: May 2017
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From: Muskogee, Ok
Was the transmission before or after the vibration?
Wondering if they got the driveshaft out of time during that job and you've been chasing it ever since if the vibe was there beforehand
Wondering if they got the driveshaft out of time during that job and you've been chasing it ever since if the vibe was there beforehand
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Tuned
Joined: Dec 2020
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how do you check to see if drive shaft is in time?
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Tuned
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I have new leaf springs front and rear and omg traction bars
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Tuned
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it is extended cab the center support bearing has probably 80k on it
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Tuned
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Lead Driver
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From: Ponca City, OK
This is very characteristic of axle wrap. Taking off from a dead stop, pulling a hill at slow speed, or loaded are instances of high torque loads being exerted on the springs. The fact that the springs are new is irrelevant. New springs flex it's kind of their job.
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Joined: May 2014
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From: Lake Hartwell, GA
I had a similar issue and was chasing axle wrap for quite a while. I installed new leaf springs, shocks, air bags and lastly OUO traction bars. The traction bars helped so much I thought it was cured.
The shudder was still there, but only starting in low or reverse in low with the 38' fifth wheel attached. I called Dave at OUO and he said "sounds like clutch chatter". Turned out the flywheel had hot spots on it that would cause the shudder/chatter.
A fresh clutch and resurfacing of the flywheel resolved all the issues and it has been smooth as silk ever since.
A couple of videos I made up while diagnosing the shudder are below.
The shudder was still there, but only starting in low or reverse in low with the 38' fifth wheel attached. I called Dave at OUO and he said "sounds like clutch chatter". Turned out the flywheel had hot spots on it that would cause the shudder/chatter.
A fresh clutch and resurfacing of the flywheel resolved all the issues and it has been smooth as silk ever since.
A couple of videos I made up while diagnosing the shudder are below.
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Tuned
Joined: Dec 2020
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I can't find any hits for omg traction bars, do you have a link or seller's website?
Video describing driveshaft phase
Video describing driveshaft phase
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Tuned
Joined: Dec 2020
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Thread Starter
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Tuned
Joined: Dec 2020
Posts: 338
Likes: 25
I had a similar issue and was chasing axle wrap for quite a while. I installed new leaf springs, shocks, air bags and lastly OUO traction bars. The traction bars helped so much I thought it was cured.
The shudder was still there, but only starting in low or reverse in low with the 38' fifth wheel attached. I called Dave at OUO and he said "sounds like clutch chatter". Turned out the flywheel had hot spots on it that would cause the shudder/chatter.
A fresh clutch and resurfacing of the flywheel resolved all the issues and it has been smooth as silk ever since.
A couple of videos I made up while diagnosing the shudder are below.
https://youtu.be/9asHJ4ggT_8?si=puSZwQMbdaemcQIU
https://youtu.be/uqQY5g4KrGo?si=3hN_Ek6lKTl1QsCT
The shudder was still there, but only starting in low or reverse in low with the 38' fifth wheel attached. I called Dave at OUO and he said "sounds like clutch chatter". Turned out the flywheel had hot spots on it that would cause the shudder/chatter.
A fresh clutch and resurfacing of the flywheel resolved all the issues and it has been smooth as silk ever since.
A couple of videos I made up while diagnosing the shudder are below.
https://youtu.be/9asHJ4ggT_8?si=puSZwQMbdaemcQIU
https://youtu.be/uqQY5g4KrGo?si=3hN_Ek6lKTl1QsCT