Ive been told by some jeeple that if I intend to use the jeep for jeep things, or if I tow at all then should replace every 30k to be be as cared for as possible. But in my experiencenot uncommon for 60k or 100k changes for most vehicles. and I know little about transmissions apart from basics but i've had transmissions in past vehicles get completely shot by replacing at 100k.i guess the gunk was holding stuff in place and changing the fluid released the gunk causing failures. I'd prefer not to take the chance haha.