A new whistle, occasionally

Jmac00

TJ Enthusiast
Lifetime Supporting Member
Joined
Feb 4, 2022
Messages
766
Location
varies every few weeks
this doesn't happen all the time, we may go 3 or 4 miles, Park, and then it will start up again? it increases and decreases with acceleration. Then it will stop for awhile

it doesn't seem to be coming from under the hood. Im wondering if there is a vacuum tube to the rear differential that is either cracked, or clogged?
I was thinking maybe the pumpkin is the cause, but it is completely dry, not even some seepage?

IDK, maybe a heat shield fell down and is making that whistle??

any ideas