</font><blockquote><font class="small">In reply to:</font><hr />
The original auto tranny in my Dodge/Cummins freewheeled in 4th gear

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Pat, there are so many different transmissions, even among the same manufacturers that I haven't kept up to date with them at all. When my brother had the Matco Tool distributorship, he had a GMC Topkick with Cat diesel (200hp I think) and an Allison transmission. He never had a problem with the transmission, but I didn't like it because it was one of those that free wheeled when you let off the accelerator. The engine and tach dropped back to an idle and you just kept rolling except for the brakes. When he got out of that business the guy who replaced him on that route got a Freightliner with a 300hp Cat and an Allison automatic. I drove his route for him for a week while he took a vacation and that Freightliner was a pleasure to drive, and when you let off the accelerator it felt much like the engine braking you'd expect with a gasoline powered vehicle and as it slowed down, you'd feel it downshifting before you stopped.