03 GMC Sierra 1500 transmission

pgsrpgsr Member Posts: 4
edited May 2015 in GMC
On my way home from work I was driving about 35-40 MPH and my rpms kicked way up like if I shifted into neutral. After pulling over and trying to see what happened I figured out that it won't shift to 3rd gear.my buddy thinks it's a seal but I was reading my repair book and it said something about a shift selinoid. I checked the atf and it was topped off.what could it be other than just broken.
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