drtgmc2000
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I have 2000 gmc sonoma SLS ext cab with 2.2 liter and automatic.
When I drove until 39 mph and starting vibration then I pressed little hard gas pedal to made to change gear then finally changed gear then vibration stop. I drove on 55 mph with criuse control or without either one. very little hill on hwy , ready go up the very little hill, then gear start to down gear, rpm go to 4000 rpm after changed gear then 3000 rpm until flat road back to normal. My truck had no heavy loaded. I t was very empty loaded. when go up the hill, feeling like truck go working hard go the hill.
Do you have any ideas what cause or.....
When I drove until 39 mph and starting vibration then I pressed little hard gas pedal to made to change gear then finally changed gear then vibration stop. I drove on 55 mph with criuse control or without either one. very little hill on hwy , ready go up the very little hill, then gear start to down gear, rpm go to 4000 rpm after changed gear then 3000 rpm until flat road back to normal. My truck had no heavy loaded. I t was very empty loaded. when go up the hill, feeling like truck go working hard go the hill.
Do you have any ideas what cause or.....