vmjeep

I keep hearing a whistling when I'm going over 40km/h, but the truck run fine I also checked rearend ujoints front and back can anyone help? It's driving me nuts

BlueXJ

Where does it sound like it is coming from? Front or rear? High or low? We need a tad more info.

120mm

In my old '85 2.8L, it used to whistle, just like it was supercharged. Sounded pretty cool, but would often run like crap, at low RPM.

Of course, the whistle was coming from a disconnected vacuum line....

theangler

I agree check all your vaccum lines. One of mine fell off of the airbox and made a very loud whistle. Didn't affect how it was running, but it sure did bother me.

vmjeep

Thanks for the information I'll check it out and keep you posted

Plan-B

ha my door seals let in whistling on the highway. its annoying.
idk if that could even be close but i thought i'd let ya know

jamaicanmecrazy

Hold your hand over the throttle body with it running (take off intake hose) hold your hand over the TB and you should be able to snuff the engine out quick.
If you have a good leak it will sputter to die.

Also whe looking for vaccum leaks I take the orfice out of my propane torch and put a long fuel line over it and turn the gas on low and put the hose near where there maybe a vaccum leak.
You will hear a raise or sputter in the RPM and you found your leak.

The propane trick comes from the days of adjusting the old Carter 4bbl venturi carb on Chryslers.

xtreme velocity

Specking of these. My tranny makes a turbo wind up noise before it shifts. sounds cool. But is it normal? Its not really loud. but if windows down and going slow you can hear it. but just a lil bit over my exhaust. It may not even be my tranny. So any idea would be cool. jeep does not run any different.

jamaicanmecrazy

The 42RE and 44RE are known for making pump noises. If it goes away after the shift then it's most likely the pressure solinoid.
I'm ordering my rebuild kits tomorrow for mine.