You can use the 2x4 box on a 4x4 *if* you're doing crossover steering.
Reason being that the 2wd box steers 'side to side' and the 4x4 steers
'front to back'.....
I don't know of any differences between the 73-87's except for hose flange
differences. My '79 takes different hoses than my '85 did - but only the
ends were different. Check it out - you may be able to find hoses that'll
work. Maybe not easy tho.
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