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The paper is concerned with a problem in the theory of congruence function fields which is analogous to a conjecture of Gross in Iwasawa Theory. Zpextensions K,,o/K 0 of congruence function fields K 0 of characteristic p ~ 2 involving no new constants are considered such that the set S of ramified primes is finite and these primes are fully ramified. Is the set of S-classes invariant under Gal(K**/K0) finite ? Gross' conjecture asserts that a similar question has an affirmative answer for the class of cyclotomic 7_ w-extensions of CM-type ifS is the set of p-primes and the classes considered are ininus S-classes. Using a formula of Witt for the norm residue symbol in cyclic p-extensions of local fields of characteristic p, a necessary and sufficient condition for the validity of the analogue of Gross' conjecture is given for a class of extensions KoJK 0. It is shown by examples that the analogue of Gross' conjecture is not always true.