Sorry,
It is a late model rear end. It is likely from a '76 chevy but it was in there before I got the truck so I'm not sure. The front crossmember is from the '76, as is the motor.
The steering column and seat is from around and '89 to a '91 model. The axle width matches the front. I kind of don't want a blazer rear end because it won't match the front wheel width.
Thanks for the replies,
Jason