My Blazer currently has the 10b/12b out of a 78. It's lifted w/ 35's and I plan to keep it that way. I believe it has 4.10's in it now, but if not I'll eventually put them in. I live in NJ, we have mud and sand but no rocks. It will see some offroad time, but it will primarily be an on-road vehicle (though not DD, it may make some trips and will see bad weather). I'm looking to build up my drivetrain. If I keep the 12b, I plan to get a posi, new axles, c-clip elim and gears and new bearings all around. Will this hold up to decent offroad abuse as well as some heavy pedal on the street? I also dont want to deal w/ the issue of trying to install new rears on my truck just for the hassles of fitment and parts hunting etc. Plus, I just ordered 6 lug rims tonight. I also came across a good deal on a 14bff. So, I'd have to get new rims again, plus figure out the front. I guess I'd upgrade to 8 lug hubs/rotors (if possible) for my 10 bolt until I installed a D60 (if ever...). The install aside, I'd still have to get a posi for the 14b and re-do all the bearings. Then I'd have to figure out brakes, and would I need to upgrade the axles? My point is, either way I will have to invest some $$. Will putting $$ into the working 12 bolt be wise? With my upgrades, what would the 12b hold up to? Is the hassle worth it for the 14b?? I know I'm asking a ton of questions (no pun intended /forums/images/graemlins/tongue.gif) but I would love for someone to help me out. I basically went over my plans for how I'll be using the truck, and I know I want peace of mind as far as rears go, whats the best way to get me there?? Thanks for any and all input!!!