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Message: <blockquote data-quote="stutaeng" data-source="post: 26844" data-attributes="member: 6175">I'm not familiar with the 4L60e, but recommend that you look into the troubleshooting diagnostics on the ATSG manual. Here's a PDF copy of it: <a href="https://atoc.ru/uploads/manual/5fb797a513efb.pdf" target="_blank">https://atoc.ru/uploads/manual/5fb797a513efb.pdf</a>Is this your symptom?[ATTACH=full]5013[/ATTACH]Doubt a sprag was installed backwards, but it may be failing intermittently.I was rebuilding a 4L80e for my brother's 90 C1500 a few years ago and initially overlooked the direct clutch sprag. It worked well and was at one point playing around with it after my regular cleaning pass, then all of the sudden I was able to freewheel both directions, which is not supposed to happen. I ordered an upgraded, late-production 34 element sprag since that was the early 16 element sprag). When I took apart the old one, the little cage-looking thing that holds the little elements had broken in a few places...[ATTACH=full]5015[/ATTACH][ATTACH=full]5014[/ATTACH]</blockquote>