Rattle Question @ 1500 RPM - Automatic Transmission?
Hey, everyone. I'm trying to diagnose a rattle I've been hearing.
I've got a mostly stock '06 TJ Unlimited with Automatic Transmission.
With the windows open or the top off, I've been hearing a rattle in the front end. I have been under there, but everything seems as tight as it should be (but I'm not too experienced on suspensions and drivelines.
I thinked I've finally nailed down the conditions to make it repeatably happen.
When I'm driving around 45-50 mph and the engine is running at 1500 RPMs, i can hear a slight rattle from under. I finally realized this because if I eased off the gas, then pushed the accelerator again, the transmission would shift gears, go up to ~2000 RPM, and the sound would go away. Then as the engine came back down to around 1500 while I maintained 45-50, the sound would come back. If I turn the O/D Off and am running around 2000 RPM at that speed, i don't hear the sound.
Further, (and this may be an incorrect observation), it only seems to happen when I am mostly flat or climbing a grade. If I'm going down a slightly incline and need to give it gas to maintain speed, I don't think I hear it. But that could just be me.