MTX Fill Plug Size and Thread Pitch

[myotis1134]

1992 MTX.

I'm looking for a replacement transmission fill plug. Apparently it has yet another funky size and pitch, which means I have to order it from someplace.

My measurements lead me to believe the plug is 21mm dia, with a 1.50 pitch. Can anyone confirm that please?

 

[blk\blk90]

I didn't even see one on rockauto, mtx or atx. But calipers dont lie, it's probably an M21-1.5. If you have a dedicated nut/bolt store in your town I'd go there. We have a place in amarillo called amarillo bolt that has damn near anything you need fastener wise. You might check out something like that.

 

[myotis1134]

Yeah I did an extensive online search and came up with nada. I also took it to the local fastener shop - AK bolt and chain, and they said I'd need to have one made.

I'm thinking about finding a large socket-head bolt that I can have machined down to a M21. Naturally there are taps and dies in that size available - just not bolts or nuts - go figure.

 

[luigisho]

Or you could look for a used tranny that went boom and see if you can buy it. There is a seller or more on ebay that is selling parts from a mtx

ask this guy https://www.ebay.com/sch/lggwelch/m.html?item=323603620123&hash=item4b5847611b:g:Xj0AAOSwyTtcFtyY:rk:14f:0&rt=nc&_trksid=p2047675.l2562

or maybe others. There is a 20 SHO's used seller in the classifieds. Try that before you go custom machining

 

[One_Shot]

Most fill plugs like these are pipe thread which is tapered so that as you tighten it it gets tighter in the hole causing a compression seal.

Not positive but based on your dimensions it looks to be a 1/2 in pipe plug to me.
Any regular ol hardware store should have one in stock to compare yours to.

 

[Irish Pride]

Go to any autoparts store. Dorman offers an assortment pack of plugs 1/8th up to 3/4". All parts stores have bins in the back with brass fittings. Tell them you are looking for Pipe Thread Plug and they should know what you mean.

 

[Irish Pride]

https://www.oreillyauto.com/detail/...utograde-1-2-14-inch-pipe-plug/090022/4177387

 

[SHO1]

Or get a slightly larger common thread plug and re-tap it