drill/tap a Muncie drain plug w/o removing trans!?! - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 15 (permalink) Old Feb 17th, 17, 12:38 PM Thread Starter
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David
 
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drill/tap a Muncie drain plug w/o removing trans!?!

OK guys, I had a WILD idea while pondering replacing the old lube in my m21. No existing drain plug. Consider this: Trans is full of old oil. You begin to drill the boss the proper size hole for tapping. Once you punch through the case, oil starts flowing out flushing any metal shards from drilling. (Messy, but there's a drain pan below catching the mess) You quickly stuff a temporary rubber plug in the new hole to stem the flow, so you can prepare for the tapping. When ready, you remove plug, insert tap and start tapping, all the while the oil is oozing out around the tap. when done, you just let it finish draining. (flush w/more oil if desired) Now, there's a few things "helping" you out here- the oil acts to keep an outward pressure on any metal particles. Plus the rotation of the drill bit is such that it is actively extracting most of the metal shards as it drills- same for the tap. If anything gets left behind, maybe the factory magnetic donut will catch it. 1 hour - done! I know this is way out there- Whaddya all think?

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post #2 of 15 (permalink) Old Feb 17th, 17, 12:50 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Sounds doable.


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post #3 of 15 (permalink) Old Feb 17th, 17, 12:52 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Or you could just jack the front up as high as possible with the driveshaft out.

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post #4 of 15 (permalink) Old Feb 17th, 17, 2:04 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Not sure about the magnet catching anything. Isn't a muncie case aluminum?
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post #5 of 15 (permalink) Old Feb 17th, 17, 4:13 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Magnet VS Alum, ??? Yes, You can do it that way. I would pull the tranny, Drill & Tap it pull the side plate and flush it out re/install. I use to take shortcuts. NO More ! Just too many " What IFs "
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post #6 of 15 (permalink) Old Feb 17th, 17, 11:56 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

DZAUTO, aka Tom Parsons, drills and taps every Muncie case that he builds!!
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post #7 of 15 (permalink) Old Feb 19th, 17, 2:16 AM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

not much fun drilling a 1/2" hole in a muncie case. I take them to a buddy who has a mill.

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post #8 of 15 (permalink) Old Feb 19th, 17, 8:57 AM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Why? It takes me about 20 minutes to pull the trans out.

What you propose would probably work though.
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post #9 of 15 (permalink) Old Jan 17th, 18, 12:59 PM
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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.
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post #10 of 15 (permalink) Old Jan 18th, 18, 5:56 PM
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Id pull the trans it take about 30 mins
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post #11 of 15 (permalink) Old Jan 18th, 18, 6:05 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

https://www.google.com/url?sa=t&sour...elD8iIDAhFEaZp
just stick a tube in the fill hole and pump the oil out.
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post #12 of 15 (permalink) Old Jan 19th, 18, 8:19 AM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Quote:
Originally Posted by Jim Mac View Post
https://www.google.com/url?sa=t&sour...elD8iIDAhFEaZp
just stick a tube in the fill hole and pump the oil out.
This.

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post #13 of 15 (permalink) Old Jan 19th, 18, 3:04 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Drill and tap the lower boss instantly converts any Muncie into an M22!

Originally only M22s had the drain plug so that was one thing to look for.

Of course, now days most Muncies for sale are M22s.
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post #14 of 15 (permalink) Old Jan 19th, 18, 5:23 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Dip your drill bit in heavy grease and it will help catch the metal shavings if you are going to do it.

.
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post #15 of 15 (permalink) Old Jan 19th, 18, 5:37 PM
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Re: drill/tap a Muncie drain plug w/o removing trans!?!

Quote:
Originally Posted by fast111s View Post
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
A twin coincidence, I did the same thing in the car on a '72 El Camino sometime in the mid '70s. Only difference was I drilled a small hole and drained the trans oil before proceeding with larger drill and reamer, and I flushed it with kerosene.
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