To my untrained eyes this appears to be a D44....however to me it also doesn't quite look like the D44's I'm used to seeing
What you're looking under is a 4x2 89 Jeep MJ long bed with a 4.0 and a BA10-5 I traded an astro van for. I'm debating fixing and selling vs parting out. If this a d44 it would be too valuable to me underneath my 91yj to let go.
speculation as to the ratio would also be welcome