Stop in for a cup of coffee

what shim is it again? Where and what size?

these?

727 End Play Shim Kit | Monster Transmission Parts

or these?

https://www.coperacingtrans.com/?product=727-washer-shimend-play

for the thrust surface on planetaries?

Year 1962 up- This shim can be used to compensate for wear on the thrust surfaces of the planetary gear train. Installs under the planetary thrust washer. This shim is .010" thick and fits both 3 and 4 pinion planetaries.

A-727 Planetary Shim 727-22700-Z
No, it's a shim that goes between the input shaft/output shaft thrust washer... .032 thick, it looks like no one makes them anymore.. i can survive without it, just pissed off dealing with a trans company that sends wrong ****, the shim kit they just sent me even says for 1989 and up and doesn't list 727 at all.. just wtf