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Forum: Diesel Discussion

10-28-2021, 12:43 PM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

Sorry, not understanding how the sympathetic...

Sorry, not understanding how the sympathetic vibration could be so high a magnitude compared to the primary if it was something past the differential. It’s typical to pick up that ~14Hz vibration on...

Forum: Diesel Discussion

10-28-2021, 01:11 AM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

That was my thought, but I don’t get your comment...

That was my thought, but I don’t get your comment about axle shaft. The axle shaft spins at the same rate as the tire. The driveshaft spins at roughly 3x.

What do you mean by “being driven” and...

Forum: Diesel Discussion

10-28-2021, 01:06 AM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

The tires are 195/65-15, and do 829 revolutions...

The tires are 195/65-15, and do 829 revolutions per mile. This at 60MPH, it’s one mile per minute, or 829 revolutions / 60s… thus 13.8Hz. 14Hz x 3 = 42.

So I’m not seeing how 14 and 42 become...

Forum: Diesel Discussion

10-24-2021, 10:27 PM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

Interesting. So, since my center bearing looks...

Interesting. So, since my center bearing looks fine (it could be binding but nothing says it is), I suspect IF it is driveline related, it would be the u-joint.

Does your driveshaft have a...

Forum: Diesel Discussion

10-24-2021, 08:08 PM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

All are very boring. Original guibos in fine...

All are very boring. Original guibos in fine shape.

https://i.imgur.com/azSNWqgl.jpg

https://i.imgur.com/42QW4LAl.jpg

https://i.imgur.com/W6VKf56l.jpg

And the other one…

Forum: Diesel Discussion

10-24-2021, 04:57 PM

Replies: 15

Tracking a floorboard vibration at ~40 mph

Views: 1,037

Posted By JHZR2

Tracking a floorboard vibration at ~40 mph

In my 1982 w123 300CD.

New tires, good, tight suspension, no steering wheel play.

Tires (15” bundts with 195/65r-15 Cooper CS5 Ultra) we’re roadforce balanced. One is showing 34# of...

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