ill try to answer as much as i can <img border="0" title="" alt="[Smile]" src="images/icons/smile.gif" />

i haven't heard of any problems with the 3.4lt
if your getting the taco i would recomend getting it with it <img border="0" title="" alt="[Wink]" src="images/icons/wink.gif" />

i think that the taco is 410 on the rear but i (that is what i have heard for the stock trucks that came with 31's)can't tell you because my rear diff code is a ? instead of the numbers <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

i can't remember the transfer case ratio <img border="0" title="" alt="[Frown]" src="images/icons/frown.gif" />

i have only heard of the factory elocker coming with the trd package
not sure if the non trd had limited or not

only problems that i have with my 98 is that there is NO way to grease the front end(tie rods bushings . . .) for some reason toyota sealed everything in the front
oh yeah if you get a taco with A.D.D. hubs (auto lockers) and not manuals i have heard not to go over a 2,1/2 to 3 inch spacer lift because the cv's can't handle it

i know that stock hight can handle 31's with no problems

1,1/2 lift you might squeeze 32's but they will rub (at least i think <img border="0" title="" alt="[Big Grin]" src="images/icons/grin.gif" /> )