I got a hold of a bunch of AD parts a few years ago. One of the items was an SM420. (I have a '47 1/2 which has a 216 with a 4 speed (non-syncro). I plan to complete a rebuilt 235 that was part of the bundle of parts and install it in the '47 along with the SM420 and a torque tube rear end. I'm not sure of the year of the torque tube, but it does have Bendix brakes so I'm assuming these will all mate together properly.) The seller said the transmission probably has water in it. (It's been stored in my garage since I brought it home.) So I've finally started to clean the case and open it up and dig in to it. When I removed the drain plug, rusty water came out. There is an odor of gear oil but its odor is off. The shifter was frozen in first gear. The transmission had a drive shaft parking brake (which I understand was used in the big trucks with an open drive shaft). I removed the park brake (see attachment 1) and the rear cover of the transmission (attachment 2 and 3). I was able to get the top cover off and remove the shift stick. I sprayed the fork assembly with Thunder Bolt and the mechanism immediately freed up. I was able to put the top assembly into the 4 forward gear positions. Inside, the components don't look too bad. From the top view, the gears and synchro rings look to be on good shape (no broken or pitted teeth). So, I have a few questions which I'm sure that the great knowledgeable minds of Stovebolt will be able to help me with. I've looked at a shop manual but there are things I'm not sure about. 1. How can I remove and clean the shift rods and forks in the top cover?
2. How can I unfreeze the gears so I can start to take it apart, clean and rebuild? (I have a rebuild kit. I'm hoping the gears and synchros are ok but have a better idea once I can free things up.
3. What do I need for the rear of the transmission (see attachment 4) so I can hook it to the torque tube?
Thanks in advance!
It's a small world, but I wouldn't want to paint it.
