How to find bolt sizes/thread pitch/ length

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Onetonftw

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I bought a 2000 K2500 ext cab short bed in pretty decent shape. It’s got the 5.7/4L80E and no idea what transfer case is in it.

The transmission went out and the last owner pulled the trans/transfer case, allegedly “rebuilt” the 4L80E and put them in the bed of the truck. Never got around to installing them, so he said. I now have to throw those back in the truck with the hopes they work. If not I’ll be pulling them back out.

The issue is I have no bolts, and no idea what to buy. Anyone have a good parts fiche or list of bolts needed. I was able to find that the bell housing bolts are 3/8-16-1.375. I have no idea what the transmission to transfer case bolts are, or mounting bolts, etc. any help is appreciated.

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xXxPARAGONxXx

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Post a photo of the RPO sticker and the VIN. Also, the transfer case will have a metal tag on it on the rear case which identifies the model of the transfer case (I think it could be either NP241, NP243, or NP246).
 
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