Does the truck have a lift kit on it?
- CV Axle spacers may be needed.
Have you recently replaced the CV Shafts?
- You may have gotten an axle that was too short / too long if you got a rebuilt axle.
It might be a worn pinion bearing in the front differential. Those can get louder with more speed. Check for excessive play in the yoke.
I would also check the hub bearings on each front wheel. Its more of a growling sound than a whining sound. I have done both of mine in the last 3 years on my 2000 GMC Sierra. They run about $60 at Napa with a 1 year warranty. You will need a slide hammer.
Jack the truck up so the wheel is off the ground and shake it. If you can move it around, its bad.
SOURCE: Whining Noise when idle and gets louder when accelerating on 2000 Nissan Altima GLE
hi more than likley to be the alternator remove your fan belt start engine see if noise disapears yates210456
SOURCE: 4wd not engaging
Is it a two wire actuator or a three wire actuator? The two wire ones are pretty unreliable. that is why Chevrolet converter them to the three wire. Check for power and ground on the two wire in 4wd. For the three is should have one ground wire, one wire that is hot in 4wd, and one wire that is hot in 2wd.
SOURCE: 4wd will not engage on 2002 gmc sierra 1500
try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)
I’m happy to assist further over the phone at https://www.6ya.com/expert/john_2c7bb9c157d0baa8
SOURCE: S-10 Blazer 4wd problem
www.amazon.com/Chiltons-Repair-Manual.../0801981425
Hope this helps you
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