[hypoxia]

Allison 4000 Transmission?  Here are some of the manuals.  My first thought is checking to see which TCM you have, I included a photo of old & new.  The old style with all of the "dots" is a common failure point.  Allison Locator  I would call a large shop that rebuilds Allison transmissions such as WW Williams or Stewart & Stevenson as they will have the most knowledgeable techs.