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I have a 2004 Chevy 2500 Allison 1000 just had tranny overhauled because I though it was the issue (could still be) when you put it in drive and start to accelerate it clunks than you get going down the road hit between50-60mph it free wheels and rpms go up and speed drops and you have to let off of the throttle for it to go back into gear. When you pull up to a stop sign or go to stop it sounds like it’s trying to go into park so you have to shut it off and put it in park and than start it put it in drive and it’s fine! It’s making a horrible grinding sound when it kicks out of gear I’m wondering if it’s not the TCase anyhwlo would be appreciated thanks!
 

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Sounds like the shifting fork in the T-case. Mine was similar but not as extreme. Just going into Neutral while rolling down the hwy and you would hear a grind first.
 
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