Re: drill/tap a Muncie drain plug w/o removing trans!?!
I just drilled and tapped the Muncie in my 1972 El Camino while the transmission was in the truck. I had to drop the exhaust pipes because they were in the way. I opened the fill plug to use the existing oil to flush the drilling. I started with a 1/4" drill, went to a 3/8" then 11/16". I allowed the oil to cool the subsequent drills and flush the shavings. I pulled the drill back often to remove the shavings as well. Then came the 1/2" tap. I used a tapered tap to ease the start and help with alignment. As with any taping, slow progress is best removing the tap occasionally to clear filings. I used my finger to clear any additional metal, plugged and filled. Dropping and replacing the exhaust pipe took as much time as the drill and tap. I used a 90 degree drill and still had to move the pipe. I have shorty headers. If you have long tube headers, it may take more time. Hope this helps. Leo
Last edited by fast111s; Jan 18th, 18 at 12:27 AM.