Eddie:
If water has gone through the transmission, you should replace:
All friction and steel plates, both front and rear band, ALL bushings, ALL bearings. Water destroys an automatic transmission. The glue that holds the friction material to the plates and bands will eventually let go. While these items may look good now, they won't last for long. You've taken the transmission apart, so don't short cut the rebuild.
Hemi parts will interchange, but you must use all hemi parts, drums, planetaries, input shaft (I believe). True HEMI parts are hard to find (remember, not a whole lot of HEMI stuff made), and when you do find them, lots of $$$$$. I've seen guys come into where I used to work, and want the front HEMI band, and when I told them that they were in the $250-300.00 range, their jaws would drop. Also, as no one to the best of my knowledge is making NEW ONES, all you can get is a relined band, and I know our band reliner would say, no rebuildable core, NO BAND. One of the aftermarket guys (a well know outfit too) would sell the flex band (stock on all 727's) as the HEMI band. A crock of crapola.
The true HEMI band is a 3 piece unit, and the backing is CAST IRON, not flex steel. To use a true HEMI band you also need the HEMI drum the band rides on because the HEMI band is wider than the stock band.
For the information of all, 4 front bands were used on the 727. The HEMI band, a one piece cast iron backing band (cop cars with 440's I think also hard to locate), a flex band made by Raybestos, and a flex band made by Borg Warner. A very good band (used in the late 518/618 transmission) is the HIGH ENERGY band made by Raybestos.
and fits the 727 with no sweat.
BUILD IT RIGHT
"ONCE"
TRANSMAN