I have the 10-bolt rear out of my challenge S10.
It's got drum brakes (I have all new wheel cylinders, drums, and shoes for it) and an open diff. I don't know the gear ratio but google has told me from the RPO codes its a 3.73 ratio (but idk for sure).
I need it gone ASAP so make me an offer.
Thanks for the interest,
Gabe