Fill & Drain Plugs 1969 Muncie M22

[Edgemontvillage]

I discovered (with help from Jerry M) that the drain and fill plugs in my 3/69 build date Muncie M22 transmission were likely from either a late 1969 or post 1969 production M22. The plugs are made by Lisle and I have seen them stamped with a P, W (with underline), the Lisle script only, with the Lisle Magnetic 2 script and Lisle Magnetic 3 script.  The Lisle Magnetic 2 design is correct for my transmission build date and most early/mid 1969 and prior M22 production transmissions. The Lisle Magnetic 2 plugs also have a unique dual spade magnet design (see "bottom view" photo).

My M22, "before" photo, Lisle Plugs with P stamping  


Lisle Magnetic 2 script plugs, top view  


Lisle Magnetic 2 script plugs, bottom view  


The installed "after" photos: Lisle Magnetic 2 script plugs






"Other" Lisle transmission plugs I have seen:


Typical of magnetic bottom design of most Lisle plugs I have seen.

[copo]

Did Jerry M say that m-22 the used a magnetic fill plug ? My original m-22 only had a magnetic plug on the drain and the fill plug was non magnetic.

[Hans L]

Looks good Lloyd.  Those are correct per my discussion with Jerry as well.   Here's the plugs that are on my Z's original M22.   After Jerry rebuilt it, he requested follow-up pics for his files and research.   Confirmed original for the car/trans.  Built date of the car is 04B.   Note that the trans came with two magnetic plugs - both the same.

[Edgemontvillage]

Looks good Lloyd.  Those are correct per my discussion with Jerry as well.   Here's the plugs that are on my Z's original M22.   After Jerry rebuilt it, he requested follow-up pics for his files and research.   Confirmed original for the car/trans.  Built date of the car is 04B.   Note that the trans came with two magnetic plugs - both the same.

Thanks for the confirmation Hans, your Lisle plugs look identical to my replacements. 

[69Z28freak]

Nice work on documenting the different plugs Lloyd. I was unaware until now that the M22 had a drain plug. Great detail here, keep up the good work.

[JohnZ]

Nice work on documenting the different plugs Lloyd. I was unaware until now that the M22 had a drain plug. Great detail here, keep up the good work.

All M22's had a drain plug. The cast boss for it was on all Muncie cases, but it was only drilled/tapped for a plug on M22's and on ALL Muncies starting in 1970. Many rebuilders also added the drain plug to pre-1970 Muncies.

[bcmiller]

I have visited the Lisle Manufacturing plant that made the original plugs.  I tried to see if they could make them again with the same original lettering.  No dice.  

I believe the LISLE 3 plug was in use prior to the M22 being introduced (so it is prior to 1965).  

There are at least three minor variations of the LISLE MAGNETIC 2 plug.  The 1969 model year type plugs were also used in 1968 M22s in Camaros.   

From what I can tell, the P and LISLE plugs are 1970 and later.  Possibly some in very late 1969 but not sure on that.  Typically used when there was both a fill and drain plug.

The W plug with underline is a fill plug, the normal plug for M20 and M21 transmissions 1969 and earlier.  

[Edgemontvillage]

I have visited the Lisle Manufacturing plant that made the original plugs.  I tried to see if they could make them again with the same original lettering.  No dice. 

I believe the LISLE 3 plug was in use prior to the M22 being introduced (so it is prior to 1965). 

There are at least three minor variations of the LISLE MAGNETIC 2 plug.  The 1969 model year type plugs were also used in 1968 M22s in Camaros.   

From what I can tell, the P and LISLE plugs are 1970 and later.  Possibly some in very late 1969 but not sure on that.  Typically used when there was both a fill and drain plug.

The W plug with underline is a fill plug, the normal plug for M20 and M21 transmissions 1969 and earlier. 

Bryon, thanks for filling in some additional details on the applications.

[bcmiller]

Lloyd, I changed your quote from my earlier post because I made some edits after you made the quote.

Your second picture shows two types of the LISLE MAGNETIC 2 plug.  I will try to post a picture of the other one later.

[bcmiller]

Well I guess there are maybe four different LISLE MAGNETIC 2 plugs.  And the 3 plug is a larger diameter.  

Plug with the 2 in the lower left is probably a 1965-1967 M22 plug.

[bcmiller]

Another picture showing plugs from both sides.  From left to right.
LISLE MAGNETIC 2
LISLE magnetic
P magnetic
W fill plug (note - not magnetic)
No marks magnetic - current plug that is not correct, but is functional for the task.  I have about 100 of these new.

[Edgemontvillage]

Another picture showing plugs from both sides.  From left to right.
LISLE MAGNETIC 2
LISLE magnetic
P magnetic
W fill plug (note - not magnetic)
No marks magnetic - current plug that is not correct, but is functional for the task.  I have about 100 of these new.

Quite the collection Bryon.

[69Z28freak]

Another picture showing plugs from both sides.  From left to right.
LISLE MAGNETIC 2
LISLE magnetic
P magnetic
W fill plug (note - not magnetic)
No marks magnetic - current plug that is not correct, but is functional for the task.  I have about 100 of these new.

Quite the collection Bryon.

Impressive!

[rodent]

I have one to give away, how do you work out who you give it to?

Not sure if it's for a '69 though 

[69Z28-RS]

Come up with a contest of some sort..  those are fun..