u/Jagerbuddy325

I have a 96 Chevy Tahoe with the 5.7. I recently started have an issue when gassing it at highway speeds. Whenever I hit the gas the RPMs rev but there’s no acceleration. Also whenever I gas it at low speeds the same thing happens but it speeds up a little then shifts hard. I changed a few different things trying to fix it but with no success. Is my transmission giving out or what else could it be?