this noise comes and goes depending on throttle pressure under heavy load and acceleration it goes away, But under coast or light throttle it has an annoying high pitched whine hard to tell if transmission or rear end
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2004 Jeep Grand Cherokee Question: high pitched whining noise
Answer #1Greg's Orange Auto (15216 Answers) , Orange, CA - (714) 361-9386globalhelper October 29, 2013, 09:34Master
ck for vac leak at intake manifold
Replyzztips, October 30, 2013, 17:55Rookie
thing is the 6 cyl engine runs smooth I do not hear a leak when it is just idling and to hear one at 100 klm it would have to be really bad I would think. At a 100klms if I let off on the gas and then apply just a little the whine comes back depending on throttle pressure.
Answer #2ziptie12 October 30, 2013, 17:16Master
What about coasting in neutral at 45-50 mph? Rule in/out drive train.
Replyzztips, October 30, 2013, 17:50Rookie
when I do that it is silent
Replyziptie12, October 30, 2013, 23:14Master
Have rear diff. checked/serviced first , then trans. Is it all-wheel drive?
Replyzztips, October 30, 2013, 23:24Rookie
yes all wheel drive