Hello everyone, first posting here but have been reading all the threads on the vibe's but not sure of this is the same. Bought the fx4 scab in August, build 5/04, with 4 miles on it and noticed 2 types of vibes shortly thereafter.

First one is during moderate acceleration about 35mph to 65 mph, there is a pulsing/rotating vibe. Feels like drive shaft or rear. I can feel it on the floor and center console but not on the console shifter itself which is why I don't think it is trans related. Shifts fine.

Second is during a highspeed coastdown. If you take the truck up to 90mph and let off the accelerator, it will vibrate the floor pretty good but smooths out when it coasts below 85 mph.

No steering wheel shimmy at all and I have read the latest tsb's but they don't seem to address these. This truck is really smooth otherwise.

Anyone else had these 2 vibes addressed and fixed ? I had the truck looked at during last oil change in December and they said engineering was working on a fix for the 2nd vibe and they did not notice the first one mentioned.

thanks for any info..