PCV valves not operating properly could cause this at certain times.

 

Most common sources for these types of noises are the following:

PCV Valves (most common in my personal experience)
Vacuum Lines
Pulleys/Belts (Check Belts & Tension)
Intake Filter
Transmission (Change Fluid if hasn't been done in awhile)
Rear Diff. (Change Fluid if hasn't been done in awhile)
Exhaust Leak (Super hard to detect leaks that small till they get worse)
Intake Manifold Gasket (not very common)
Throttle Body & Intake Connectors (much more common in older silicon/cheapo connection joints)


I have come across an easy method for detection if it is along the intake tract. Get yourself a few cans of Brake Cleaner Spray (Rattle Can type), then spray in short bursts along the intake tract, stop and listen between sprays... when you here the idle droop (almost like its going to stall) you have found the area your intake/vacuum leak is.

NOTE: DO NOT SPRAY ANY SENSORS OR ELECTRICAL CONNECTORS!!!!

Disclaimer: Do this at your own risk, I assume no responsibility if you damage any part of your vehicle.

I personally have never had a problem when doing this myself on my own vehicles, and it has always helped me find the leaks.[/QUOTE]



That definitely sounds like a perfect checklist to start working on. Thanks

 

anytime... happy hunting!

 

The sound im hearing isnt loud or even constant. Ive checked everything cant find it. When the hood is up and im giving it throttle i cant hear it. the only time i hear it is when im driving and barely touch the throttle once past that point i dont hear anything. so for now i guess im gonna ignore it unless it gets worse.

 

Then you're problem is likely in the drive-train...

When was the last time you checked wheel bearings, and all your suspension bushings/linkages?

Have you modified any of the suspension or drive-train?

 

i put a leveling kit on it back in feb replaced swaybar end links with moog. just recently installed energy suspension bushings on the end links as the moog ones were real soft and it was rattling pretty bad. the new bushings worked like a charm. all the ball joints, tie rods, and bushings are all good. also had an alignment after installing leveling kit. The drivetrain i havent touched or serviced since i got the truck in January. It would probably be a good idea to drain and fill the diffs and maybe flush the trans.

 

Possibly.
They way you describe the noise i couldnt inagine it being your diff, but i wouldnt put it past it.

 

I do have a slight leak on the rear diff driveshaft output seal no drip just residual oil and dirt arond the seal. Any recommended diff fluid to use on the rams and weights?

 

Before you waste money on 100 fluid change pay 50 to get the rear trans seal replaced

 

Yea i asked on another forum what size diff i had found out then he said if i were you i wouldn't touch it if there's no drip or puddle. lol didn't take his advice so yea im planning on doing that myself then fluid that's why i asked what type of fluid is best.