so i was looking at buying a 1988 toyota pickup and the guy told me the rear was locked, he didnt wheel and he didnt put a locker there and he said he owned the truck since it was new. I passed up on the truck because i didnt like it and i bought a 93 4runner. The 4 runner is stock and when i turn the rear wheels chirp. I was wondering if toyota offered a locked rear diff. any years? any info would be great. Thanks.