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After looking at the CL listing, that is a transmission for a bigger truck than a pickup. Notice the large parking brake drum on the output shaft. That's probably an Allison since they were used on some bigger delivery type trucks that had a 7.3 in them. That would be a lot heavier transmission weight-wise than a 4R100.
I had that tranny on my 1991 F590F Superduty.
Had the 7.3 IDI and that is a E4OD Superduty tranny. If I am correct it has the 4 bolt torque converter and not the 6 bolt