andy browns tire, Groaning noise from rear

by andy brown
(gulfport,ms)

On a 2009 convertible automatic when first drive in the morning from the rear there is a groaning noise like there is no lubrication in the half shafts or the transmission also can feel it through the gear shift knob dealer says this is normal said all fluids are full trans, rear differential when i asked about the new gm additive told 2009 got the new additive after the the trans warms up to around 105 115 noise goes away is this normal?

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