How wide is the rear axle on a 79 pickup?

 

Here some info for you...

Axle width:

73-78 ~ 53"
79-83 ~ 55"
84-88 ~ 57"
89-95 ~ 58.5"
95-04 ~ 60"


Wheelbase:

79-95 Std Cab ~ 103" wheelbase
84-88 X-cab/ std longbed ~ 112" wheelbase
89-95 X-cab/ std longbed ~ 122" wheelbase


Rough offset guide:

7" ~ +30-35
7.5" ~ +35-40
8" ~ +40-45
8.5" +45 and up.