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The first second shift is manual. The second third shift is 200 below governed. The rest of the shifts are 600 below governed. It sounds like they set it to shift using the rated hp or the governor is not set correctly. What is you'd governor set at?

OP what is the model number of the trans in your truck. You need to read the tag to se what version of the trans you have

If you read the Allison mech tips you may have to modify the trans to work with an exhaust brake

What are you not happy about?

If I remember correctly the shift point adjustment is internal on the mt series trans and is best set on the bench.

I was just about to upload tha manual. Here is the mechanics tips

Please look at the model number tag on the side of you trans. I know it is a MT654 but the suffix will tell you if it has a retarder built in it. An Allison dealer or tech support should be able to confirm if this information. I believe that your trans is lockup and probably also has the...