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OT - 1995 Suburban howling noise

E

eremoao

Member
I have a 95 Suburban 4x4 and before I start tearing into things I don"t need to I wanted to ask for your advice. The howling noise is when you are accelerating or staying at a constant speed. Seems to me to be coming from the front of the truck or the transmission. Is very loud when accelerating and a little less so when staying at a constant speed. Seems to go away when decelerating. Not a break issue, I"m thinking either transmission or transfer case.

Any ideas where to start?
 
If the noise absolutely comes and goes when you change the accelerator pedal and changes pitch upwards as speed increases, that's ring gear and pinion howl.

Been working on transmissions since I was a baby and have never heard a noise out of 'em except for a hashy converter sound and there is no doubt about that noise. It sounds like a meat grinder.

I've heard 'em make a light "whine" in lower gears after someone has mismatched the planetary gearsets, but I don't think that's what you are describing.

I'd sure be looking at that rear end.

Allan
 
Also,

Tires will set up a heck of racket if they are feathered, but that is usually a somewhat lower pitched 'rumble' sound.

You can check wheel bearings by swaying the outfit from side to side while in motion. If the pitch changes, it indicates a load varation on a weak wheel bearing.

Pinion and side carrier bearings are a pretty much "constant pitch" type whine. You know, like I've got in my old pickup. :>)

Allan
 
Had a similiar situation last week...A squealing/low grinding noise seemed to stay with the rpm of the engine...thought it was the transmission or the heater blower motor...turned out it was in the front of the engine... right in the front and center of the engine between the alternator and air conditioner compressor there is an idler pulley ...it was giving out ...the ball bearings were slowing grinding away...it had been this way about over a month and half ....btw my truck is an 98' chevy k2500 .....just a thought...good luck :wink:
 
Transfercase might be near empty. Seems to be an item that gets neglected and tends to leak out where the driveshaft plugs in. I've checked many and found them to be empty. I suspect some people assume they are common fill with the trans and do not need to be checked separately. The New Process 241C transfercase takes thin Dextron and leaks out pretty easy since that driveshaft moves in and out of the seal whenever the suspension goes up and down.

That all being said, hypoid gears are bearings in differentials are often the biggest howlers. Also wheel bearings.
 
I had some really odd 'come and go' noises on my '96 Chevy pickup. Turned out to be u joints! Both were SHOT!
 
Well, I check some of these out tomorrow. I think I will start by checking the fluid in the transfer case. The noise almost sound as if I have it in 4 wheel drive low. Could it be the converter? I had replaced the stop light thing and there was a rod for the converter held on by a little clip, I'm wondering if maybe that clip worked it way loose and that rod came out. Don't know if this means anything but gas milage has been terrible since this started.
 
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