i have a 8.8 out of a mustang for my model a it has 4 lug other than not as many wheel choices are there any down sides to running 4 lug...i cant seem to figure out why people keep telling me to swap to 5 lug
Wheel choice would be the only reason as I have seen 10 second Mustangs with 4 lugs, so strength is not an issue.
You can buy all the parts you need at your local pick-a-part. One side of an explorer 8.8 is the same length/spline and already 5 lug so you'll be stripping one side of two trucks. Grab the 5 lug brake parts when you're there, but be sure those come from opposite sides so the hardware is correct. Few minutes on a 5.0 board and you should have all the spotters info you need for the yard. good luck