  In this paper, we compute the natural density of rank-$1$ Drinfeld module
over $\mathbb{F}_q[T]$ with surjective adelic Galois representation; and the
natural density of rank-$2$ Drinfeld modules over $\mathbb{F}_q[T]$ whose
$\mathfrak{l}$-adic Galois image containing the special linear subgroup for
finitely many prime ideal $\mathfrak{l}$.
