I love simple, but kinda humbled that the simple part of it was myself! The magnetic plug was in the 420 long ago. DPO I guess. I'm using synthetic fluids evrywhere except my steering box where i use some old "motor honey" I have laying around . It leaks out slowly. I also considered using chainsaw bar oil, it's pretty heavy as well. Thanks for all your support Nate. Jim
Waitaminute !! Jim ; You don't fill the tranny via the tiny hole above the U-joint ~ that'll overfill the tranny and gaurantee leaks ! look on the passenger side of the tranny , about 1/2 way up , there should be a square headed plug 1/2" NPT ~ THAT'S the filler plug , I bet if you remove it , the excess gear oil will burp out . That top filler plug was for rapidly filling the U-Joint cavity in the factory when the truck was first assembed and if it was original , it had a Zerk fitting in it .
Steering Box Sector Shaft Oil Seal Jim ; This seal can be changed In Situ but it's a stinker of a job sometimes as the old seal typically comes out in tiny pieces . The seal is still available from GM , just tell your Chevy Truck parts man you need the steering box shaft seal for a 1970 C-10 with manual steering , they sell a top quality seal for maybe $10.00 , it's been a year or two since I bought one . You _MUST_ use a big socket or pipe to drift the new seal in with even pressure all around it else it'll leak as badly if not worse than the old one did . -Nate
