Hey gents, I have a '67 with a 10-bolt, locker (not sure what type) and 4.11 gears. I purchased it like that but would like to change it to a posi and 3.73. I found a rear end from a '69. It's a 10-bolt with 3.73s, it's got a posi, and he's selling it for $600. My question is will a '69 rear...