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If You call GV They will recommend an oil to use. It is a lot thicker then I would have thought. I was using automatic transmission
fluid in Mine and it shifted like thunder. I changed the oil and it still shifts firm but I can stand to shift with out letting off the throttle.
from GearVender,
GM#12346190 or Mopar #04874459 Synthetic Gear Oil. GM#1052271 Petroleum based gear oil is allowed but results in a firmer shift.
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