Auto trans on 96 4wd

[RLGipe]

My 96 Ram 4wd with auto trans makes a very loud groaning noise shortly after running.  The sound goes away after shifting into neutral for a few seconds, then returns a short time later. Don't know if it's trans or maybe torque converter. Any help would be helpful.

[AmberFireDaK]

Have you checked the fluid level? when was the last time you had it changed?

The 42/46 and I think the 48 too RE transmissions don't pump the fluid around in park, only in gear or neutral.

[maxedout]

Does it do it more in reverse than anyother gear? If so its the pressure regulator valve in the valvebody. The were made of a lightweight alloy and would buzz, there was a TSB to change them to a steel valve to stop the buzz. If the noise is more than a buzz and more like a power steering pump with low fluid type sound, then that may be your torque converter. Usualy first signs of failure.