I have a 2003 Chevrolet 2500HD with 242,000 miles. I have recently been experiencing a stutter/hiccup in what I believe is a transmission issue.

There is a slight hesitation once or a couple in a row, but not consistently going down the road, just at random times. It happens at high speed without much incline/decline. The truck is loaded with a 2,000lbs truck camper and sits for several weeks to a month at time. I also recently experienced a lack of reverse when it had set for an extended period of time. The truck finally responded after short time. The hesitation of slight motion going down the Interstate can really keep a guy on edge.

I changed both filters and fluid at 232,000 miles. I also change the external filter once a year with about 10,000 miles between changes. The fluid has been checked hot and is full.

Any thoughts? Thank you.