[lolife99]

Just add a 2wd crossmember to your 4x4 frame and use a flip kit on the rear.
No need to swap frames.

If you can find a donor 2wd pickup,... that would be the best.
You'll need the transmission, tranny crossmember, and other parts.
You can even add aftermarket 67-70 6-lug disc rotors and keep it 6-lug so you don't have to change the rear axles.
Or swap in the pickup 5-lug rearend also and make it 5-lug.

I love the full top 73-75 blazers!