CARGUYS

Anyone experiencing a slight harmonic vibration from about 42mph to 49 mph .Its very slight, thougth at first it was the M/T tires. Mine is a 08 RUBICON auto, 2 door.

miguelylucy

Is your ride stock??? or lifted ??

smith jk

DO YOU HAVE AN AUTO TRANS?
MINE ACTS FUNNY AROUND 40 TO 45 MPH. RIGHT AROUND THE SHIFT POINT

smith jk

Sorry, I Seen Where You Do Have An Auto.

wayoflife

Just out of curiosity, what are your RPM's at that speed? Maybe around 3700?

CARGUYS

stock height for now, its around 1800 rpm ..I read that the computer takes a while to learn your driving pattern. It seems like 40-47 mph appears to be an auto shift point?? funny though its not hunting for a gear.

voodoojk

i have a 2dr auto and mine does this as well. Starts at 1450 rpms and continues to about 1550. I can close my eyes ( figuratively speaking of course) and tell when i am at that rpm range. Set my watch by it.This is about 45mph.

Just had it at the dealer and their answer was " they all do it"

RedRockJK

Sounds like an out of balance tire. Seriously, that mph range is associated with a bent wheel or out of balance tire in a LOT of cases.
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CARGUYS

They all do it ??????????????? WOW. did you ask them about the TSB for reflash and torque converter ??? Just curios before I wast a day with them.

CARGUYS

voodoojk, my rpm is also about 1450, checked today, so the dealer says its normal