[benoit454]

what size tires and measure from the ground to the bottom of the bumper.

We don't have our truck anymore but had an 86 with a 4 inch lift and 33's and I remember the bumper heights.

Also look in the back, see if it has a block under the springs, if so how big is that block?

Now they do have spring lifts instead of blocks and some kits are block and add a leaf, so maybe count the leafs of see if the big thick one is on the bottom it's short and thick, I aint sure if add a leafs go over that one or under it, I'd guess over it. But the rear should have a 4 inch or 6 inch block, maybe a 4 inch with add a leaf to make it six.

So check both bumpers from ground to bottom and what type are they stock?