87 troopers have the same 8 bolt frt and the 10 bolt rear they are just wider stance and the frt suspension is the the same as the 88 design, the 10 bolt frt and 12 bolt rear was produced after sept 87 as an 88 although an 88 12 bolt will bolt right in and will hook right up with a litle effort ,one word of caution on the of chance you ever run up on an 87 t dsl the rear and frt gears were changed only on that one model to 4.11 instead of the normal 4.56 jerry