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Sounds like something was telling the computer to lock the torque converter when it was in reverse. It's supposed to unlock when you press the brakes, which would explain why it was fine when the brake lights were on. Good that it wasn't the computer, '87 has a different trans vs other years and that might've been a tricky unit to find a replacement for. Good to hear you got it in the end, though, and thanks for closing the loop!

Been a while since i updated this thread, and have since had a fair shares of ups and downs. For starters i did my passenger rear wheel bearing, while it didnt make any noise it had a ton of play which im told is common for them, but i went with the usual napa part and it went smoothly. i think it took less than half an hour to do. After that since i didnt know all the maintenance history on this vehicle i did the front and rear diff fluids, easy job just tiring pumping in all the fluid but again short and easy. A little after doing this i noticed a rather large problem. When i inspected this suv before purchase i noticed the front diff pinion seal was leaking, but it didnt look that bad. Now that its winter and ive used the auto mode a couple times i noticed it will piss fluid. Tried to take care of that yesterday, ordered the part from napa and went at it. Once i had it all fully apart (but the seal still in place) i realized it was the wrong seal. Returned the part got my $20 back and had to go through the annoying process of putting it all back together and wasting more diff fluid. I looked a bit online and saw a DIY on titan talk where the person had the same issue and the listed part is way too small so it looks like ill have to get a Nissan one from work for x4 the price (with employee discount). Also did an oil change and now a new battery (725 CCA felt the 640 was a bit undersized for the v8) so been spending a lot on maintenance, come the new year ill attempt that pinion seal again and at some point i have a power steering line to do aswell. Oh i also did a rear brake service because on both sides the pins were super seized (needed the torches for 1 pin per side) and was causing very uneven pad wear. From the start i was unhappy with the brakes and was confused seeing people wanting to upgrade to v8 brakes and after fixing mine i will agree they do be good. As for fun stuff I finally got air lift. I ordered from 4WP and after a month of them not shipping i cancelled my order. It would have cost like 145Cad at the time i think maybe a bit more. I saw them on amazon for $100 and tried to order but no matter where i tried shipping them too it said amazon could not ship it so i assumed it was just a bug and a lost cause. Fast forward a month or 2 and i saw the prices keep dropping and dropping and at one point they were $58. Magically i tried to order them and it actually went through! Was super stoaked for that price and immediately installed. While i did the traditional install of skipping using the T and running individual lines to each bag, I also covered the lines in some plastic wire loom for some added protection. I forgot to take measurements but id say i went from level-ish maybe a bit saggy (I have a DIY drawer system with some weight in the rear) to having some rake so im pretty happy with the results and will be able to tow better in the future. As for ride quality i run around 14PSI and its a bit harsh on some bumps but overall its all good.