Hi I have a 2001 GMC Sonoma Highrider Edition it has the 4.3 Vortex and its 4x4 my transmission has been whining alightly it has 169,000 miles on it runs and shifts great it when's when ever its in park and whins threw 1st gear from what I can tell but it doesn't whine in Reverse from what I can tell. Any clues or information would be appreciated this is my first truck and I love it so far and Id hate for the transmission to crap on me