[thor]

I have a 350, 700R4, NP205 combo in my 72 blazer. I bought my tranny from a coworker who had it BUILT. The tranny had the output shaft you listed to make it "look" like the TH350 it was replacing. Then using the stock Th350-NP205 adapter it bolted right-up. I chose to use the factory 350 location, then bolt-on the tranny, then bolt-on the transfer case, then bolt-on the crossmember. This gave me locations to drill new holes. I then cut my tranny cover for the new shifter location. This was about 2" towards the rear; from what I read the actual measurement is 1-7/8" but I think it's always better to mock-up. So, if you wanted the shifter in the stock position I would agree that the engine would need to move forward ~2". Not sure about front diff clearance though. Something to think about.

I understand that with the 4L60e you need to have the adapter with reluctor wheel for the VSS. However, reading AA site you attached, I am unsure if this will add length to the end of the 4L60e. As a follow-up question you might want to pose to AA, will this negate the need for the new output shaft? Could save you some bucks and a rebuild. Then again, if you do need the new output shaft, you can also beef-up other components that break inside the 4L60e.