I've been reading all the bad news about the GL5 80-90W gear lube so I thought I'd change it in the M-20 I have. Guess what, there is no drain plug. There is a fill plug on the side but that's it. The bottom of the gear box only has a blank where a plug should be. Now what? Can I drill and tap the blank and install a plug or do I have to pull the speedo gear and stand the car up on the rear bumper?o No: Thanks, OJ
Thanks for your reply. I have a suction pump but I hesitated using it because any sedament trapped in the oil settles to the bottom of the case and I doubt a pump will be able to get at it. A drain plug is usually magnitized to trap the bits of metal. I suppose I could flush the gear box with fuel oil or karosene before refilling the lube. OJ
Some Muncies are like that. Take the lower, center bolt out of the tail shaft housing. Thats how the fluid comes out.
None of the lower tail housing bolt will drain any of the gear lube out of a Muncie 4-speed... Hope this helps... Crash
