Installing more seats
What a pain in the butt! To do it properly, you'll need to drop the fuel tank and some heat shields. I made a custom base with a swiveling bucket seat. I ended up bolting it through the floor in three places. All three were on the body support crossmembers, so at least two layers of steel. I also used large fender washers, lock washers, and grade 8 bolts.
I also replaced the base of the front passenger bucket to a swivel out of a 94 conversion van. Three holes lined up enough to drill holes or use current ones in the base. I had to weld an extension on the base for the fourth hole. That one was much easier.
I'll say you'll need plenty of rust penetrant for any current hardware on the exterior of the van.
In the back it looks pretty open underneath to reinstall the bench. I have ordered the seat belt from ford and it looks straightforward to install. The biggest part will be getting the holes drilled in the right spots underneath. I’ll probably drill up from the bottom with a small drill bit and then a bigger one down from the top so I know I’m centered in the crossmember. Not a lot of options for putting it in a different spot, so it’;s just copying the setup from the factory.
what is interesting is that the bench seat bracket does not appear to be the same as the ones use in the fourth row of the bigger vans. I don’t understand why. Adding the seatbelt looks to be an easy job. The crossmember for the fourth row is missing underneath the back to match what’s in front. I can’t figure out if I would need to buy the crossmember and install and drill into it or just get a flat plate to attach
to, but the rear holes for the fourth row don’t line up with a crossmember that is present on mine.
Showing is how I secured a fully loaded Snap On double bay tool box that's about 39" tall, located just behind the front seats like this:
To achieve the most secure and stable mounting the box sits just about in the middle of a cross member so using the aluminum angle shown I drilled holes through the floor that are on either side of that cross member. Fitting the aluminum channel on each side I capture three different cross members spreading any load over them, nothing is attached only to the floor sheet metal.
FWIW this tool box recently suffered a rear end collision that was significant but the box didn't move a bit. Long story short you're on the right track mounting the seats to the most solid points available whether they're factory parts or of your own creation.
Good luck on your project---you seem to have it well thought out and proceeding nicely.
I've been wanting to do this in mine. Please keep us updated with pics. Good luck!







