Replacing 727 Low/Reverse Band Pin O-Ring in Car

Short of pulling the trans. Make sure to remove speedometer gear. Have new tailshaft gasket and output seal. Depending on how old seal is on selector shaft to the valve body might want to consider it as well, just thinking pulling valve body might cause it to leak. Could pull valve body, loosen rear band adjuster, put pan back on temporarily, support with floor jack and wood, that’d enable you to pull crossmember and mount so you could slide tailshaft housing off. I’ve used a large course thread screw to pull the pin for the band. Issue is if the piece between the actuating arm and the band falls out you will be making up new words reinstalling it. Make absolutely sure fan is well clear of radiator.