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Old 02-25-2007, 12:13 PM
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Need how-to advice

I want to add a drain plug to my transmission pan. (Too cheap to buy a new pan) I have basic welding skills but I want it to be "leak-proof". What is the procedure or is there a non-welded type that can be used?

Mike

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Old 02-25-2007, 01:58 PM
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B&M and the other trans kit marketers, offer a trans drain plug kit that you insert into a drilled hole in the oil pan.
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Old 02-25-2007, 06:55 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
B&M and the other trans kit marketers, offer a trans drain plug kit that you insert into a drilled hole in the oil pan.
Yup, and I usually weld the female piece to the outside of the pan, then use the nylon seal and nut inside to make the seal. Now you can remove the plug without accidentally loosening the whole mess!

Russ
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Old 02-25-2007, 07:34 PM
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IMHO, just drilling a hole in your pan and using a thread-cutting plug is looking for trouble.

GM used to (prob still do) make a weld-in 1/2" STD tab for the engine oil pan which would likely work just fine for your trans pan.

NAPA also make a "bulkhead" style drain plug kit that threads together, which might be a bit easier than the weld-in reinforcement.


NAPA # BKP 704-1074
Buy either one of these, and you'll probably never have a problem with it.
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Old 02-25-2007, 09:13 PM
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I use a 1/2" fine tread bolt & castle nut for my drain plugs. I first find a good spot to put the plug where it wont interfere with anything inside the transmission, like the filter, manual valve linkage, wiring, etc. Then I take the castle nut & bolt & screw them together with the castle nut upside down inside the pan. Then I put six spot welds the castle nut on to the pan, I keep the cut out notches on the castle nut open for draining purposes. Then I remove the bolt & flat file the pan at the hole. I then use a banjo washer on the bolt & tighten it down. It costs about a dollar in parts if I get enough to do 5 or more pans.
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