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The upper and lower ball joints, and the two outside tie rod ends are the only zerk fittings you will find. GM went to a sealed rear tie rod end around 89 or 90.
There are aftermarket rear tie rod ends that may have fittings so if they have been replaced at some point, you should look.
Most of the replacement u-joints for the driveshaft and half-shaft are the sealed type, but there are greaseabe u-joints out there so a check is in order there too.