If you do this, figure a day a country for crossing time. The borders can be a real pain and the drivers (especially second class bus drivers) have a death wish!
Be aware too that Central American mechanics generally are good at bandaids but don't expect anything they do to be of real high quality. Look over whatever you find VERY CAREFULLY and make sure that your life insurance is paid up if you plan to drive all the way to the states!
This is a link to my FJ45LV in Guatemala
http://forum.ih8mud.com/fj45-owners-club/76830-nuther-fj45lv-resto-thread-67-central-american-model.html
Here's a link to the issues that directly may affect life safety that were on my FJ45LV when I drove it back.
http://forum.ih8mud.com/fj45-owners-club/58524-things-im-glad-i-didnt-know.html
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'82 BJ60 H55 tranny, AXT turbo 3B diesel, high nickel alloy head, A/C, BDS lift, factory PTO, Aussie rear locker, OEM LSD front, 4:11's, 32's, PERFECT frame!
'76 FJ55, 3B turbo, alloy head, H41 tranny, 3 sp. transfer, 33's, A/C, PTO winch, long range tank!
'67 FJ45LV shop project c/w 3B turbo diesel transplant & H41 4 speed, 3 speed transfer, PTO!
www.wirrell.com