I pulled the pan and adjusted the bands. Transmission looked nice and clean. I did find the Transgo stage3 kit that I installed calls for a 2 1/2 turn out on the rear band, not the 4 the factory called for. And the front is 2 turns out. Both settings were close. I reassembled and test drove while on the stands and it still does it a little. If I allow the rpm to get to 2500 or more you don't notice it at all. Also while putting some load on it with the brakes it does not do it. I will probably call Transgo and just confirm what I have going on. But it may be a normal thing with the "tighter" adjustment they call for.

Greg, I'm sorry I misread your remarks before that Ruster did the same thing for 10 years. So it may just be their "overlap" event like you said.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

No problem.

Good to confirm things on your end.

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IIRC, there was a TSB & a performance bulletin, both regarding the Low/Reverse piston cocking & binding as it showed service wear. The fix was to machine the inner seal land(large end) undersize a certain amount & round the sharp edges slightly on both. There were also new apply pistons manufactured with the fixes/features new.
I didn't put a shift kit in the K6, but did weld the hole up in the transfer plate to block the L/R Band from applying in manual low, I was tired of burning the kickdown band out of the 904's. I neglected however(duh), to yank the check ball in the valve body when I re-assembled it, ...You guessed it, as soon as it shifted into 2nd it locked the back wheels in the gravel driveway, as I had backed up to turn around first.
Yeah, it's like pulling the park brake.

Check out Fairbanks/Superior rear servos I've put them in the past few transactions I have been inside of. MAde to prevent cocking in the bore and also cracking. These are billet, not cast aluminum. I don't remember the 904 version but I know the 727/518/46RH/RE version has dual seal rings.
Also check out sonnax as they have a bunch of upgrades for these transmissions