Soo theirs a squealing noise coming from the engine bay. Its not the belt its in good condition and tight, I think its the harmonic balancer cause it looks like its wableing and the tensionor seems a little loose but the bolt is tight. I gotta get a video up some time.

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'99 ranger super cab 4.0v6 5 speed

Put your ear to the air intake and make sure it isn't an intake noise.

well the tenshiner ushualy shakes but it could be a berring in one of the pullys. and just to make shure its not the belt do the soap trick and get a bar of dove soap and put it on the belt wile its running.

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2003 Ranger FX4 Off Road 3 Inch Lift On 33x12.5 BFG A/T
Fog Light Mod
06 Tail Lights & Mirrors
2004 sonic blue lightning
1994 Straight Drag Race Cobra Mustang
2004 Street Race Mustang {SOLD.....}
2008 SRT8 Jeep

Mine did the same but only when the weather cooled and got moist for me it was the tensioner pulley.Oops this was 5 months ago.

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2001 2wd Ford Ranger XLT 4.0 SOHC, Fabteck 3 1/2 spindle lift front 2 in blocks rear.

or use wd-40. just a quick spray though

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1998 ranger extended cab, 2wd, 4.0 ohv, 5 speed, sony xploid 52 4 way watt radio, 2 pair of pioneer 240 watt speakers, Cobra 29 LX LCD CB radio pushing 100 watts, k&n air filter, 15 inch exploder wheels, dual exhaust with 4 inch stainless tips, 2 12 inch subs with a 1000 watt amp just for the hell of it!

new project: dirt track modified racing at the local saturday night track.

if it isn't the belt, try removing the belt and turn each pully by hand to see which one gives you resistance....I'm also bettin on the tensioner.