I have a 94 cherokee 4.0L 2wd with and automatic transmission. When I accelerate from a stop it makes a noise if I accelerate normally. If I accelerate easy it will not make the noise. It only makes the noise in first gear (as best I can tell). I just changed the fluid and filter. The filter was not clogged, and the fluid was not burned. I didn't see any flakes in the pan or any large accumulation on the magnets. Anyone have any ideas?

First off, what kind of noise? It cold be your rear-end making the noise. Driveshaft is an awesome conductor for sound.

u-joints lubed recently?