Loud squealing on 93 Sierra

[YoungGuy]

When I first start my 93 k1500 it runs normal. A few minutes after I start driving my engine starts to squeal and becomes obnoxiously loud. It is loud under the hood but is almost deafening when lying under the truck. Also when I turn the truck off it sounds like it is sorta of screeching to a stop.

I've replaced my crank pulley thinking it was wobbling too much and putting too much pressure on my other pulleys, the power steering pump and pulley, the tensioner pulley, and even my belt. I'm beginning to think it's my harmonic balancer but I am not completely sure.

Any ideas or help would be a HUGE help.

 

[2013Denial]

Alternator bearings, A/C compressor clutch, power steering pump bearing. Those a re all things that can should like a squealing belt when they go out.

If it's louder when under the truck I would think power steering as the other two are up top. Does the squealing change at all when you turn the steering wheel?

Does it go away after it starts or do you just have to ignore it while you drive? Are there any glossy spots on the new belt you put on that would indicate the belt if slipping on one of the pulleys?

 

[YoungGuy]

Turns out it is coming from my bell housing. It only starts after it is warmed up. It's starts really quiet and then slowly increases in volume until it is ridiculously loud. I have removed my flex plate and there is no damage or warping. Would it be my torque converter or front pump?

 

[RotorHead Dave]

I have the same problem and I changed my harmonic balancer and the sound is still there. Does your sound go away when you press the gas pedal? I have a 1994 GMC Sierra 4.3L V6 190,218 miles. I cannot figure out this noise!? Have you fix your sound yet?