For the bolts that hold the third member in, what is the bolt size. 3/8 by 24 teeth per inch???

 

Um, I hope this doesn't sound like a smart-aleck but... don't you mean the studs in the axle housing?
A 9 inch doesn't use bolts. It uses studs in the housing, and nuts to retain the third member (chunk or hogshead) in place.

 

The OP is correct....these are bolts.

According to the pic in the parts catalog, these bolts are installed from the inside of the housing.

There are serrations on these bolts (similar to what wheel studs have) that hold them fast into the housing.

All you see on the outside of the housing are threads...which makes the bolts appear to be studs.

10) D9AZ4347B replaced C1AW4347A .. Bolt-Carrier to Housing / 3/8" -24 x 1 3/8" / Available from Ford.

MSRP each: $3.66 // FTE sponsor PARTSGUYED.COM price each: $2.64.
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10) 34445S7 .. Castle Nut-Carrier to Housing Bolt / 3/8" -24 / Obsolete

 

Thanks for the correction and the thread size. I was so happy the nut stripped instead of the "stud."