1972 3/4 4x4 rear end questions

[Mike C]

This is a recurring thread. Spring centers on 67-72 4x4 is 40.5", the same as a 73-87 one ton truck. 73-87 1/2 and 3/4 ton trucks have 42.5" spring centers, the same as 67-72 2x4 trucks.

So yes, you will have to move not only the shock mounts but the spring mounts. I preferred the 72 shock mounts on my Jimmy and used them on the '86 Suburban 9.5" 14 bolt that I swapped in. The SF 14 has 3 1/4" axle tubes so I reused the 86 spring pads.