You should be fine with that combo but you should( it you haven't already ) upgrade the T-case input to a 23 spline. The adpaters hold up fine it usally the 21spline input shaft or the output shaft( only a few have broken ) of the T-case that fails. We have lots of customers running v8s with toy cases and there doing extreme hard core rockcrawling. Laying down 2 patches is hard on the t-case but so is having 2 tires wedged locked under a rock. As far as the toy trans gos unless its a R series( R151F, R150F ) it will break part real easy behind a V8 or V6.