Originally Posted by Jesse2609
Hi i have a 2005 6 speed manual tj and i bought it used, anyway also when i idle it makes that rattle noise in the transmission, once i put the clutch in it goes away then let out it comes back. I had someone listen to it they said it sounded like the throughout bearing. idk just thought i'd put mine in as well.
Curse of the Jeep manual transmissions and MOPAR fluid. Change your fluid, and I suggest a 3rd party synthetic like AMSOil Synchromesh or Royal Purple Synchromax. Some, but not all, have had success with these as well as Pennzoil synchromesh. I just replaced the fluid in my 5-speed with the Royal Purple and it got rid of the rattle sound and made everything shift much smoother even after it gets hot, whereas before it would stick in gear and shift rough in lower gears.