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Message: <blockquote data-quote="mayvillain" data-source="post: 24789" data-attributes="member: 12127">I bought a 2002 Silverado 2500HD (8.1/Allison) in March, 135,000 miles. Love this truck.Went on a somewhat unplanned 4x4 adventure in Bishop, CA. During a very long, very steep climb in 4x4 High, I noticed the Trans Temp got to 250; highest I've ever seen it. I pulled over and cooled off and it never got above 205 the rest of the trip. Returning to town a couple days later, I noticed my first shift (1 > 2, if I recall) on the paved road was a bit jarring. Then, coming to a stop at a red light, an extremely rough shift as I came to a full stop. This happened twice. I noticed the trans fluid was low, just within the Cold hashmarks with the truck at full temp. I topped if off with Dex 6 to the proper level (used Dex 6 because I wasn't sure what was in it). I haven't had any hard shifts since then. I am planning to service the transmission with this package ASAP: [URL unfurl="true"]https://dmaxstore.com/products/allison-service-package-fluid-filter[/URL]Any cause for concern or advice for me?</blockquote>