transmission pan drain plug mod

Topic: transmission pan drain plug mod (Read 3434 times) previous topic - next topic

transmission pan drain plug mod

September 14, 2014, 11:50:07 AM

go find yourself a piece of hardware called a "Jack Nut"

drill the hole in the pan to rear driver side **ONLY**
drill anywhere else and you have no guaranteed drain plug clearance.
seal as you see if and think it through how you do so.
I used jb-weld as my seal.
the jack nut itself crimps in place so it isn't going to come out once installed... its basically an anchor nut with a convenient shoulder on the other side.

first, slip on a flat washer to the jack nut, add a reasonable o-ring and slide it down to the washer
second, insert jack nut, snug in your bolt then keep the jack nut stationary while you tighten the bolt.
the sides of the jack nut will collapse and crimp down on the interior of the pan.

now you can drain your fluid before filter changes.

this is something everybody should be able to do.

transmission pan drain plug mod

Reply #1 – September 14, 2014, 02:54:50 PM

I got a 4R70W pan, made a 13mm hole in the logical spot and welded a thin 12x1.75 nut inside. I use a GM drain plug with a o-ring set in the shoulder and a low profile t-30 on the outside. I think it came out of a Saturn with an early EcoTec engine. I had to fill one bolt hole with epoxy (on the trans case) and make one new bolt hole in the trans pan. It makes pulling the pan a much cleaner affair.

transmission pan drain plug mod

Reply #2 – September 14, 2014, 08:06:01 PM

I just bought a kit from the parts store, was cheap also.

transmission pan drain plug mod

Reply #3 – September 16, 2014, 05:37:43 AM

I personally would not use NUT CERTS. They are light duty and lack a good seal. You can easily spin them when tightening them up. I weld a nut inside the pan and use a GM oil pan plug or a plug from an L80E. They have a built in O RING as FOE points out and work great. Basically the removal 0f the drain plug was done because the manufacturer wanted the pan removed to clean it out and change the filter. But a drain plug is a plus. Also those inserts are thin and i have seen many of them on big rigs used to mount Mirrors and they work ok but sometimes work loose and sometime break the bend overs. B&M makes a nice drain plug kit.

http://www.amazon.com/80250-Automatic-Transmission-Universal-Drain/dp/B00029WR78

transmission pan drain plug mod

Reply #4 – September 18, 2014, 01:28:47 PM

That B&M piece looks like what I installed on mine, works great so far but I havent drained it since I last serviced the tranny and installed the plug.

transmission pan drain plug mod

Reply #5 – September 18, 2014, 07:38:07 PM

Make sure you use a wrench to hold back on the big nut. Another words use 2 wrenches so the inside nut does not loosen up and you will have no problems. have a great evening Guys.

transmission pan drain plug mod

Reply #6 – September 20, 2014, 12:17:34 AM

I just use the B&M piece on my Thunderbird. Works great.

transmission pan drain plug mod

Reply #7 – September 20, 2014, 10:02:06 PM

tom,
its a "Jack Nut" I used.

transmission pan drain plug mod

Reply #8 – September 20, 2014, 10:53:47 PM

Same thing Jay. We do not call them Jack Nuts. Just a different nomenclature. Sorry man i think the mod does not pass muster. Just me not being critical. The pan needs removing to install a drain so why not the B&M unit. They work great and are only 12 bucks. just me have a great evening.

transmission pan drain plug mod

Reply #9 – September 21, 2014, 09:48:30 AM

Tom,
The pan is removed although you say it was not, even with a picture I cant offer more.
the NutSert is a brand and very very different from a "jack nut", no nomenclature likeness at all , they are two different animals.

the NutSert will end up leaving a 3/8'' high shoulder on the inside of the pan, thus a lot of fluid will remain in the pan.
with the chosen jacknut its allowing most all fluid to drain.

I could have used a "Pemnut" as well but it would stick out the bottom too far for my liking.

I know for a fact you don't read the threads here, you just scroll down and post your body slams so often its rather condescending... but that's you and I don't mind..

transmission pan drain plug mod

Reply #10 – September 21, 2014, 05:35:12 PM

Still do not like that way. basically a drain plug is used to drain off the oil before pan removal. So what is the difference if a little still remains. And further more the converter has to be drained and some do not have that capability. Older ford units did. But once again not being critical just honest the way you did this is something i would not do. Just me and that is friend to friend. Have a great day Guys.

transmission pan drain plug mod

Reply #11 – September 21, 2014, 08:46:42 PM

good point,,
on the converter,,,,,
I notice that there is an access hole in the lower portion of the bell housing.

why is this hole there and I don't remember seeing a drain plug for the converter on the one we just yanked out. Do oem converters have a drain plug?

the only way I have been able to get more oil out is with the pan off, I start the car and quickly shift from drive to reverse back and forth a couple times to help swing some more oil over and out into my pan.

transmission pan drain plug mod

Reply #12 – September 21, 2014, 09:29:10 PM

My stock 88 had a converter drain plug and I used it last time I drained the pan and filter swap.

transmission pan drain plug mod

Reply #13 – September 22, 2014, 05:46:42 AM

Most Ford trannys have them. I really do not know if they still do. I am a 6 SPEEDER guy. But i used to drain them all the time.

transmission pan drain plug mod

Reply #14 – September 30, 2014, 09:07:26 AM

If the plug is gone on the AOD converter that means that the fluid has been changed in it already.