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View Full Version : Feels Like a Rumble Strip at 21-24 MPH



Arrison24
05-25-2015, 06:56 AM
I used the search tool and could not find anything. I have no idea where to start looking on the car for this. I will be as descriptive as possible.

2008 Pontiac G8 GT

When driving at about 21-24 MPH, it feels like the rear wheel is going over a rumble strip.

This happens only when accelerating.

It is perfectly normal at 20 MPH and it is back to normal at 25 MPH

This happens in any gear. I have taken the car to that speed in 1st, 2nd, and 3rd gear.

Possibly irrelevant- Sometimes it does not happen AT FIRST, as in, the first couple miles of driving before the car is "warmed up"

I figure it can't be engine or transmission related because it is very specifically at that speed, having nothing to do with gear or RPM range.

Any help is much appreciated. Thank you in advance!

WhatNext
05-25-2015, 08:57 AM
Anything abnormal looking in the rear tire treads? OK that takes 5 minutes. Next I would check the differential fluid.

lanceg
05-26-2015, 11:10 PM
Try jacking up the rear and grab the tire and try to move left and right and up and down to check for anything loose like bad bearing or bushing