Powerglide trans disassembly
This is probably an aluminum glide I assume? Do you have a Chiltons or Motors manual? If not, go to a public library as most larger ones carry them and read up on the Powerglide; they are real easy. It sounds like you have the extension housing off; next would be the speedo drive gear; then the govenor; then on 1965 and 1/2 and earlier models the rear pump assembly-don't forget the pin, they usually fall out but can be stuck; then the entire planetary/output shaft assembly comes out of the case. Or are you talking about the reverse gear apply clutch assembly? That needs a tool to compress the ring and springs in order to remove the retainer ring; then a little compressed air to the reverse feed or strong fingers to get the reverse piston out. These are easy transmissions to work on, tear down, and rebuild; just be careful not to mix up 1.76:1 and 1.82:1 input shafts and planetary assemblies as they are different in lenth---they will go together, and will even work in some cases, but not for long!!! If it's a cast iron Powerglide get a gym membership first and do a little bodybuilding before attepting to work on one.