Problems with overdrive--46C8

hi there the only time i had troble with the overdrive engagement on my 49 commodore i used to drive was due to gearbox oil getting in to the solenoid housing. i took the cap off and let the oil out and dried off and cleaned the governor contact points ,oily points prevented any power getting to the solenoid and i never had any more trouble -it worked perfectly ;if your transmission has been rebuilt its possible that the internals of the transmissionhave turned with the overdrive solenoid removed thus allowing the blocker ring to rotate so that instead of the pawl being able to slot through the ring gap into the sun wheel it meets the solid part of the blocker ring and is unable to engage.if the solenoid is not getting power check the governor is ok and the points are clean .no power can get to the slenoid until at about 18 mph the centrifugal force onthe bob weights in the governor close the points and allow current from the feed wire to reach and energise the solenoid.its about 40 years since i last did this job but i think i remember an insulating washer on solenoid feedwire terminal and leaving out that washer would ground the live feed an blow a fuse every time you operate the overdrive knob--worth checking sorry if im teaching grandma to suck eggs but it might just help-regards-- bernard slade