Biological process

regulation of gamma-delta T lymphocyte differentiation, regulation of gamma-delta T-cell differentiation, regulation of gamma-delta T-lymphocyte differentiation

Any process that modulates the frequency, rate or extent of gamma-delta T cell differentiation.

regulation of gamma-delta T cell development

Note that immunologists typically use the word 'development' to refer to cells of B or T cell lineages undergoing the process that GO describes as 'cell differentiation'.