2004 allison

[katyjevoich76]

my 2004 hd started to make a noise that i thought was the turbo. An additional engine humb only at highway speed under load.but yesterday the tranny gave up.While cruising down the highway all of a sudden the trnny shifted down, not sure what gear but it was 50 mph at 3000rpm and will not shift up or down you can manually shift to park or reverse but not lower or higher going foreward,Does anyone know what is going on with it and how much im looking to spend on the repair or rebuild?Also the last few miles before it gave up the speedo started to bounce a little.This was the only warning that our noise was the tranny and not the engine.Any info would be great. thanks mark.