M50-DR1HD vs non hd spacer plate difference

[5ohRanger]

I bought a 01 ranger 4.0 5 speed today to swap into my 99 4.0 truck. The 01 was missing the spacer between the trans and the transfer case. No problem!!... I have a junk case at home I'll just pull it off the old one and fix the 01 trans... wrong! The trans I pulled the spacer off of is a 91 4.0 trans and the output shaft has a notched "gear" type thing on it and the 90 model dont... any body know if the output shaft will interchange so I can use the spacer?

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[5ohRanger]

So just for giggles I pulled the gear or cog or whatever it is off the shaft and the spacer plate fit but.... not sure where that seal is riding so ot sure if it's gonna work or not. Need the trans out of the truck to get a better look at it

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[5ohRanger]

So I just pulled the "HD" transmission out and to my suprise it doesn't have the extra hole for the sohc that is supposed to have. I am confused now... it has the rear OSS sensor cog and the new style slave cylinder. Is there any way to tell that this is a HD transmission by looking at a casting number or anything? Starting to wonder if someone didn't build this trans out of a non hd to accommodate this 01 sohc truck...

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