no,the specs. are not the same.
85 and some 86
6X139.7Stock wheels are 15"According to this:http://www.discountedwheelwarehouse.com/Nissan___Vehicle_Bolt_Pattern_Reference.cfm
yes
no
no
no
no 84 and 85 swap out.
Yes it is. 2wd must stay with 2wd and 4wd must stay with 4wd. 6cyl ones must stay with 6 cyl ones. The 96 though will need to transfers it's Speed sensors to the older transmission.
no sir ,87 and 88 change out.
yes
Where is the drain plug for 86 nissan pickup