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06 lly 6 speed manual problems

6434 Views 37 Replies 11 Participants Last post by  06_DRW_LLY
I recently bought an 06 gmc lly with a 6 speed manual tranny. When i get up to around 75-80 mph the rpms are up around 2200-2300 and the service engine light comes on. At this point you cant go any faster....sounds like the thing is going to blow up. Whats the deal?
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