Turbo Action 17255E Torqueflite 727, 904, 998 & 999 Electronic Valve Body (PRND21) - Manual (Page 7)

Part #17255E 5/27/04 Page #7
Center of Transmission
Part #17131A
Piston Blocker
3/16” Hole
Outside of Transmission
Large Diameter
of Accumulator
Small Diameter
of Accumulator
Accumulator
Fig. #6 - Accumulator
CAUTION:
Transmissions “727” & “904” manufactured in 1971
and later may have a hole drilled in the bottom of the
accumulator bore. This hole must be blocked. Please
note that some units have an elongated hole on the
side of the bore which is fine to be left as is. 1971 or
newer transmissions have a Part #35XXXXX or higher
on the pan rail driver’s side.
1970 or older transmissions Part #34XXXXX or lower
will have a hole in the bottom of the bore, but does
not require being blocked.