What is your question?
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What is your question?
2 & 3 GEAR SLIPPING
What makes this problem better or worse?
NA
How long has your 2000 GMC Yukon had this problem?
3 DAY
1 Reply
Start by checking level and condition of fluid. If it's low add fluid. If it's not low and totally black you may have some internal transmission issues. Either way a computer scan will be a good place to start but plan for the worst. Alex