DaveInDenver
Middle Income Semi-Redneck
Frames are different but the parts are usually interchangeable. There are sometimes localized differences, for the example the front spindles on all 3 are similar but the Tacoma upper ball joint taper is slightly different such that an upper ball joint from a 4Runner doesn't full seat. But you can swap the spindle and then the UCA would be fine.I don't think there is a whole lot of parts crossover between the 4runner/FJ and the Tacoma. The former is built off of a completely different platform (the LC Prado) from the latter.
Things like diffs are the same, axles are similar save for the leaf springs in the back (and in that Hilux rear springs *could* work but you have to cut off the inverted hangers and weld on new hangers to use the traditional type). A 1GR-FE is a 1GR-FE, although 4Runner got the dual VVTi that the Tacoma never did. Transmissions are similar, although gearing isn't always the same.
Transfer cases are swapped from the FJC to the Taco and what hold you up is finding a path through the floor and tricking the front diff to engage 4WD. Mechanically it's a bolt-on affair. Things like relays and connectors are universal across Toyota. People use the 4Runner or Hilux transfer case selector (the Hilux has an electrical t-case on some models I gather), which is plug-and-play. It's a nicer looking switch and Toyota saw fit to actually put illumination in it.
The 120 series Prado and 4Runner aren't exactly the same either. The Prado, Tacoma, 4Runner, FJC, GX, Hilux, Fortuner are a family of vehicles but IMHO it's not easy to say one is the same as the other beyond the Prado and GX, which are practically identical. I think it's probably the case that they are all derivatives of the same IMV platform, if anything.
One thing that might be argued is the suppliers for Tacoma are North American and it seems that Denso or Aisin-Seiki in the U.S. might not hold themselves to the same standard as their sister companies in Japan. That's probably not really a quantitative argument, though.
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