Here is a used Muncie 4-speed transmission 1-2 slider sleeve. It's the earlier slider with the smaller strut key pocket, see photos. It is in good usable condition, not perfect, and a little wear, see photos. GM part number WT297-15. Will fit M20 M21 and M22 4-speed transmissions. I also have the 3-4 slider.
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It can be picked up at
428 Grasslands Rd.
Valhalla N.Y. 10595
I can ship it if you like. Call or email me your State and Zip code for shipping charges. Ask for George.