COLD START NOISE on 2006 Chevrolet Trailblazer

2006 CHEVROLET TRAILBLAIZER: UPON COLD START IGNITION, THERE IS A "VIBRATION" SOUND COMING FROM THE RIGHT ENGINE AREA. COLD RUNNING, WHEN SHIFTS INTO REVERSE, THE NOISE SOUNDS AGAIN. COLD RUNNING, WHEN MOVING THE NOISE SOUNDS AGAIN WHEN SHIFTING INTO 2ND, BUT LOUDER WHEN SHIFTING INTO 3RD. AFTER THE CYCLE GOES THROUGH ONE TIME, THE NOISE IS NOT HEARD AGAIN. IF THE TEMPERATURE OUTSIDE IS BELOW 60 DEGREES, THE NOISE IS HEARD UPON START UP, REVERSE, AND DRIVING SHIFTING INTO 2ND & 3RD GEARS. IF THE TEMPERATURE IS ABOVE 60 DEGREES I DO NOT HEAR THIS VIBRATION NOISE. I WARM UP THE VEHICLE BEFORE MOVING, SO I DON'T HEAR THIS NOISE, BUT SOMETIMES THE "WARM UP" DOESN'T MATTER IF THE TEMP IS BELOW 60 DEGREES. PLEASE HELP

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maybe oil pressure is low