XLIntel
+1y
Some things to consider...
1st...18's & lo pros, you can re-work the A/C box and keep your a/c when bodydropped. Also, I believe someone did it with 20's (moved a/c to inside of dash - but Im unsure)
When I had my '00 Ranger X-cab shortbed, (sold awhile ago) I had 18x8 w/35 tires, yota front clip, 2x3 box 1/4" thick from the firewall back (and A/C blew cold).
To stock floor yours.. you can do what you were saying, lay the 2x3 in the old frame, weld it up, cut out the old one, etc etc. I don't recall if the rear of the frame kick down in the back like you are saying. Best bet is to get under your truck and look. Oh, and as for engine mounts, either make new ones or just modify the stock ones to drop down. Again, I didnt use my stock frame so new mounts were made. If you have the time, know-how, and money.. get the yota front clip and build a new frame from there (w/ the trad. BD on the bed like you want). That way, you can still drive your truck around and then just swamp frames basically when you're ready.