Changing gears from D3 to overdrive while driving will not hurt your tranny. It is also ok to leave it in OD for most city driving. Even alot of stop and go. Downshifting from OD to D3 is also ok. I've done this for years to save the brakes when decelerating from highway speeds. Never a tranny problem. 88 Chevy K2500 (98K), 97 GMC K2500 (54K), 95 Jeep Grand Cherokee (45K), 01 Pathfinder (46K), all good to go. Good luck with your GMC. I love mine. LtScud
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