I think my daily driver 04 envoy got jealous seeing me rebuild the trailblazer transmission..it just crapped out on me..no gears work just revs away..i noticed it slipping about a week ago..driving steady and then rpms just jumps with no acceleration..hoping its something i can fix without pulling the trans..ill post more when i get it back to the house..luckily it broke down just a few blocks away..any pre removal diagnostics suggestions would be appreciated though