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Thanks! I appreciate the help!

To GMCYukalade GMCYukalade, Thanks for your prompt reply. Are you saying I SHOULDN'T have had the trans fluid flushed? I bought the truck 5 years ago with 58,000 miles on it. I don't know if or when the trans fluid had been changed before I bought it but it seemed OK (didn't seem burnt...

Hey guys, I'm hoping you can help me diagnose this from afar. My '99 Yukon 5.7 liter seems to be having an auto trans issue. As I get to about 45-50 mph (normal/conservative driving) there seems to be a hard shift like it's banging into gear. Sometimes it seems like it goes in OK then quickly...