Severe Deceleration Vibration
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
No check engine light has come on at all.
Dan,
My BTS transmission was installed in late June and has less than 8k miles on it. The driveshaft has new u-joints and carrier bearing and was re-balanced as of last Thursday. The differential, ring and pinion and bearings were all replaced last Thursday as well. I drove away from the drivetrain shop and it shuddered worse than before. I dropped the tank and cleared the fuel bowl out and it hasn't done it again.
I have had the lift for 140k miles now (240k on the truck) and I have never felt vibrations like what was happening last week.
Dan,
My BTS transmission was installed in late June and has less than 8k miles on it. The driveshaft has new u-joints and carrier bearing and was re-balanced as of last Thursday. The differential, ring and pinion and bearings were all replaced last Thursday as well. I drove away from the drivetrain shop and it shuddered worse than before. I dropped the tank and cleared the fuel bowl out and it hasn't done it again.
I have had the lift for 140k miles now (240k on the truck) and I have never felt vibrations like what was happening last week.
I have cleared the codes, but have not checked them again...been running like a chicken with my head cut off. I probably won't get to check them until after Thanksgiving now.
Are you saying the injectors are completely shut off as soon as your foot is released from the accelerator?
Are you saying the injectors are completely shut off as soon as your foot is released from the accelerator?
Senior User
Joined: Nov 2009
Posts: 230
Likes: 0
From: Tampa, FL
Ok heres another ave of approach, you say you balanced your tires, but check them for flat spots. I too have 35s and the first pair I ever put on somehow ended up getting flat spots in them, like the treads wore in some spots more than others. They can be balanced but if they're not round, they'll bounce.
You can narrow it down by the type of vibration. You described it as "mud in a tire" so a lower frequency vibration would lead you to look at larger objects where an offset in weight would have a larger circle to go around. The drive shaft U joints also cause a vibration but theirs would be a higher frequency such as a jackhammer or something fast. (I know, replaced mine a few times already!)
Hope that helps!
You can narrow it down by the type of vibration. You described it as "mud in a tire" so a lower frequency vibration would lead you to look at larger objects where an offset in weight would have a larger circle to go around. The drive shaft U joints also cause a vibration but theirs would be a higher frequency such as a jackhammer or something fast. (I know, replaced mine a few times already!)
Hope that helps!
Thread Starter
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,815
Likes: 24
From: Houston
You can narrow it down by the type of vibration. You described it as "mud in a tire" so a lower frequency vibration would lead you to look at larger objects where an offset in weight would have a larger circle to go around. The drive shaft U joints also cause a vibration but theirs would be a higher frequency such as a jackhammer or something fast. (I know, replaced mine a few times already!)
Hope that helps!
Hope that helps!
Dan,
I can't say for sure if I was above ore below 1300 rpm. The time I noticed it the most was coming to a stop or starting off in traffic. I could have very well been under 1300 rpm. I hope I am understanding you right in that the injectors are shut off above 1300 rpm on decel, but firing below 1300 rpm.
It's just weird. I know one thing. It was very consistent when it was "vibrating" and now it seems to be gone. Hopefully it doesn't rear its ugly head again when I get ready to head to Colorado.
Senior User
Joined: Nov 2010
Posts: 153
Likes: 0
From: Spencer, ma
I just went though this, on my truck it was the drive shaft out of balance. aat first driving the truck was ok then I noticed the vibration mostly on decel between 45-35 and it was pretty good like I had on big lug mud tires.. So I did some reading here and thought it was u joints and carrier.
So I did the ujoints and carrier, and still had the same vibration, so I took it back out and brought it over to a drive shaft shop for balance. first he told me I put it out of phase (all the joints must line up) I said ok.. then he took it for a day and balanced it.. needed the weights removed not added (weird) but now all is good.
Im still tracking a front end vibration that is slight and sounds like a wheel bearing.. I have replaced the ball joints, u jonts, wheel bearings and went to manual hubs and still have it.. at this point im guessing this one is the tires. The truck has a lot of miles anyway so I did not mind doing the above stuff to make it right.
So I did the ujoints and carrier, and still had the same vibration, so I took it back out and brought it over to a drive shaft shop for balance. first he told me I put it out of phase (all the joints must line up) I said ok.. then he took it for a day and balanced it.. needed the weights removed not added (weird) but now all is good.
Im still tracking a front end vibration that is slight and sounds like a wheel bearing.. I have replaced the ball joints, u jonts, wheel bearings and went to manual hubs and still have it.. at this point im guessing this one is the tires. The truck has a lot of miles anyway so I did not mind doing the above stuff to make it right.
Senior User
Joined: Nov 2009
Posts: 230
Likes: 0
From: Tampa, FL
Not so much a mud IN the tire, but a mud tire missing every other lug. Or going over rumble strips. If the tires were flat spotted, I don't know why it wouldn't still be doing it.
Dan,
I can't say for sure if I was above ore below 1300 rpm. The time I noticed it the most was coming to a stop or starting off in traffic. I could have very well been under 1300 rpm. I hope I am understanding you right in that the injectors are shut off above 1300 rpm on decel, but firing below 1300 rpm.
It's just weird. I know one thing. It was very consistent when it was "vibrating" and now it seems to be gone. Hopefully it doesn't rear its ugly head again when I get ready to head to Colorado.
Dan,
I can't say for sure if I was above ore below 1300 rpm. The time I noticed it the most was coming to a stop or starting off in traffic. I could have very well been under 1300 rpm. I hope I am understanding you right in that the injectors are shut off above 1300 rpm on decel, but firing below 1300 rpm.
It's just weird. I know one thing. It was very consistent when it was "vibrating" and now it seems to be gone. Hopefully it doesn't rear its ugly head again when I get ready to head to Colorado.
My mistake, then that would be a higher freq vibration, such as drive shaft out of balance, U joints, carrier bearing, etc. Something with a smaller diameter rotation.
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,815
Likes: 24
From: Houston
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