The only linkage that would need adjusting would be the throttle pressure, and it's sort of a "move and try" situation until you get the smoothest shift without RPM flare-up between speeds. The Dual Range transmission is VERY sensitive on throttle pressure adjustment. The 1-2 shift happens almost as soon as the vehicle starts moving, probably at less than 10 MPH. Is your transmission actually a 55 or later model? The 55-up Hydramatics only have one band adjustment accessible without dropping the pan, while 54 and earlier has two adjusters on the outside of the case. The 55's need the factory tool to do the internal front band adjustment.
The rear band on the 55-up is adjusted by loosening the adjuster several turns, then putting the gear selector in LOW with the parking brake set firmly, and tightening the band until it just touches the drum. (you can feel it get snug) Then go to Neutral, and count the number of clockwise turns until it gets snug again. Turn back (counterclockwise) 1/3 the number of turns which were needed to tighten the band in the neutral position. Confirm that the adjuster is tight when in the low position, and loose in Neutral. If so, tighten the lock nut. I seem to remember the front band adjustment involved using a 1/4" spacer between the adjusting screw and the band, and tightening to 72 inch-pounds before tightening the lock nut, but it's been a very long time since I was inside a dual range transmission. I remember Dad using a Craftsman 7/16" open-end wrench as his "special adjusting tool", as it was exactly 1/4" thick! He rebuilt thousands of transmissions in Nashville in the 1950's and 60's!
Jerry
Last edited by Hotrod Lincoln; 10/11/2010 3:46 AM.
