I just installed an M41 trans and B20 (both from a '73 1800ES) into my 122. The trans appears to work fine EXCEPT when I try and switch from 4th to OD. Without fail, the OD solenoid will click on for a second (w/ an immediate, audible drop in RPM), as though the OD was trying to engage, but then immediately "slips" back out of OD. Another strange finding is that this only occurs EVERY OTHER time that I flip the OD switch on- otherwise it doesn't appear to engage at all. It doesn't matter if I switch back and forth immediately or wait several minutes- it only momentarily engages everyother time I "flip" the toggle switch. The wiring is fine to/ from the switch and relay and to the solenoid. The oil (30W castrol) level is fine also. I purchased this trans as well as the accompanying/ attached B20F (retrofitted w/ my SUs) and was told that everything worked fine from the PO prior to taking them out of his ES. Any ideas onthings to check or is the solenoid just beginning to die? Is the toggle an acceptable (although temporary)switch to be using or do I need to consider a momentary contact switch to engage the solenoid/OD? Thanks, SJA