Vibration between 55-60MPH

[Davin]

Hey everyone. I rebuilt my engine and transmission and was able to passed California smog. However, between 55-60MPH only, there is heavy vibration. Not too sure if this may be due to the Zip Kit or maybe a loose overdrive band? Any ideas?

 

[scotts90ranger]

Usually that speed is a blown band in a tire

 

[rusty ol ranger]

Usually that speed is a blown band in a tire

Ive had tweaked driveshafts and iffy u joints do some odd things around those speeds too.

 

[97RangerXLT]

Usually that speed is a blown band in a tire

I think this or just maybe one of your balance weights fell off is the most common issue... rotate the tires front to back and vice versa and see if the vibration shifts or changes.

AJ

 

[MikeG]

Sounds exactly like the crappy Firestone tires I had on my Exploder from the factory in the 90s. Get to highway speeds and it would shake like a dog passing a peach pit....

If it goes away at speeds above that, that's what the driveshaft in my son's f150 did. Had to get it rebalanced and things got a lot better.