New Trans, lost reverse...
[ame="https://www.youtube.com/watch?v=DFe7WOD3cSU"]Part 12 727 Rear Servo Assembly - YouTube[/ame]
this shows the 727 rear servo which is basically the same as the 904 rear servo......it shows the installation....for removal
remove snap ring and it will come out.....the servo moving up and down moves the band strut which engages the rear band which is where reverse is....
as i said...either the servo...band strut...or the band is not working...
you dont have time to drop pan and check servo...but you have time to remove and replace transmission...LOL