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Fiat 500 Sport 2012, 141k miles, vibration at specific RPM 3600-3700 and kicks right before stopping after transmisson rebuild and axle replacement

1K views 0 replies 1 participant last post by  Ironkitt 
#1 ·
After the transmission was rebuilt, axle replaced car picked up two new anomalies that did not exist before:
1. When in Drive at any gear (checked 2,3,4) at various speeds, but identical RPM 3600-3700 car will start vibrating, it disappears after crossing 4000 RPM completely.
When gear shifts and RPM falls down when passing through 3600-3700 the vibration is weaker but shows up too.
When pushing gas in Parked it is smooth through entire RPM range.
Transmission service doesn't know what it is and don't know how to fix it, they say they can barely feel that vibration, but knowing the car for so many years it is extremely annoying for me.
2. When slowing down at the lights, right before the car stops there is a kick like sometimes when switching Parking to Reverse or Reverse to Drive, you can feel the gear kicking in or whatever that is.
 
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