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update: Thank the Lord simple tranny service, new filter and fluid. Went with Valvoline ATF GM Chevy flavor. Also added some Lucas and I haven't heard it purr so smoothly. Shifting better. So thankfully I did not need a rebuild. Thank you for the advice SS. Keep Truck'n

So 400 hydromatic is the TH400 ... why would the tranny not be the TH700 ? there is a GMC suburban that has a TH700 says is it compatible. sorry answered my own question. gearing is different on the th700.

1985 M1009 6.2. Looks all stock original. So transmission is making a winding up noise as I go down the road. Best description I can give is one of those fast remote control cars you build sound to me. Just started couple days ago. Feels like tranny is on its way out. Was told by auto shop guy...