Yes. The 2 pinion, going back to the 80 series, is adequately engineered for its applications. The 4 pinion is inadequately engineered for its applications, specifically A-trac.
Take it back, not even a close call. The price is too high and it's not the right vehicle for you in the first place. These vehicles are not economically viable unless you're going to do most of the work yourself.
My snugged down gaskets have been good for 6 years now. I'm hoping to get 10 years out of them, at which point I will snug them down again. I'm planning to replace the gaskets somewhere in the 2035 to 2040 timeframe.
I just completed the process on a totaled Mercedes, rather pleased with the result. They lowballed me a bit, I threw out the number that I wanted and we ended up roughly splitting the difference. It took about two weeks and I actually got the...