4L60E chevy transmission will not shift out of 2nd gear

4L60E chevy transmission will not shift out of 2nd gear I have a '95 chevy Silverado extended cab 2wd w/ 5.0L motor that will not shift from 2nd to 3rd gear, there is no slippage just no 3rd or o/d. I've changed the filter and oil, checked solonoids and they operate fine, VSS is working fine. Any ideas would be helpful ty