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LibbyMetro 03-19-2008 08:45 PM

1995 K1500
 
hey guys my pickup is acting up , for the past couple months when gas is applied, and only when gas is applied i have a loud humming noise that smoothes out the faster i go, but doesnt start until i hit 25 mph no matter what gear im in , as soon as i let of the gas it goes away, front cv shafts are good, u joints are good, rear pinion bearing has no play in it. Im stumped, help would be appreciatted

Red 03-19-2008 08:52 PM

Driveshaft CV ball?

LibbyMetro 03-19-2008 09:25 PM

ball? what do you mean ?

RH77 03-19-2008 09:38 PM

Speculations... (since it isn't engine speed or specific-gear dependent)

In addition to Red's suggestion...
Tire wear
Driveshaft out-of-balance
How's the rear diff gear oil?
Have you tried the 4-wheel drive engage/disengage?

Any more info on the problem -- does it do it in neutral, things like that?

RH77

LibbyMetro 03-19-2008 09:49 PM

tires are nearly new 33 inch BFG all terrains, with no unusual tire wear , all the weights that were on the shaft are still on , rear diff oil is ful both front and rear, it not in the 4 wheel drive already tested that, somewhere in the tranny on back

H4MM3R 03-19-2008 09:53 PM

How many miles on your truck. Your fuel pump might be going bad.

LibbyMetro 03-19-2008 10:15 PM

its not the fuel pump, been checked, its in the driveline , 216,000 on the truck 55,000 on the tranny, tranny flushed 4000 ago, goes in for pitman arm , idler arm , and alignment tommorow

H4MM3R 03-19-2008 10:17 PM

exhaust leak?

LibbyMetro 03-19-2008 10:25 PM

lol no , its in the driveline i can feel the humm in my pedal

H4MM3R 03-19-2008 10:47 PM

Put an extra pair of socks on.


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