So the 1990 V15 has 235K miles. I just got a factory reman'd 700R4 installed with a cooler. The old tranny was original and everything was worn out, but what the hell, it made it 235K. The Blazer's been screaming tranny for 20K miles before it finally lost 3rd. It's also been screaming rear diff for at least as long. It's the corporate 10 bolt which apparently is not that good for off road durability. I am now married to it, somewhat limited budget, but I am not sure that I want to spend a thousand bucks rebuilding a corporate 10 bolt, that's going to need everything. Here's the questions: What's a good alternative stronger rear diff that's still 6 lug? I know about the 14 bolt, Dana60 etc. that are 8 lug. The Blazer has the corporate 10 bolt in the front too. Very low off road miles, I'd like to change the gears up front and that's it. Now for the gears; She's got 33's right now with a 4" lift. 3:73 gears. Kind of doggish on the hills, and I don't want to hurt the latest 700R4. What's a good ratio for 33-35" tires? I'll never go any bigger than 35's. Thanks.