Guy (1991) proposed a linkage between empirical linguistics, in the morphological constraints of /-t,d/ deletion, and formal linguistic theory, in lexical phonology. He hypothesized an explanation for the actual rate of deletion reported in /-t,d/ studies in the three-tier lexical phonology model (Kiparsky, 1979): namely, that an exponential relationship exists in the relative rate of deletion of /-t,d/ clusters in words, according to different morphological classes as described in the three-tier model. In this article, the hypothesis is tested in the English of 45 Chicanos from Los Angeles, which as a recently formed dialect provides an interesting test case in two respects. A major difference exists between the English of older and younger Chicanos involving the morphological classes associated with /-t,d/ deletion. Additionally, age grading of the /-t,d/ deletion process operates only among the younger speakers. Guy's model receives solid independent confirmation in the Chicano English data. These results simultaneously integrate the three-tier lexical phonology model, Guy's hypothesis, and the dialect-specific characteristics of Chicano English.