Have no idea.
The data plate is missing, and the sequential number I found on the frame doesn't match the title I got with it.

Have had a few who know, reallllly know, these rigs judge from pics. Given the trans, transfer, axle and spring pack combination they're guessing something in the 6600-6800# GVW range. It could be a J3400 or J3600.

"There are three kinds of men
Those who learn by reading
The few who learn by observing
The rest have to pee on the
electric fence and find out
for themselves."