my truck makes a loud thump when using my 4wd help??

GMC SONOMA
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DIRE NEED OF HELP
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i have a 2003 gmc sonoma, i tried to use my 4wd and i hear a loud thump but works fine when using the 2wd, what is my problem??... milage is 170000 and motor is 4.2.. i was told my cv joint axle needs to be changed but i cant pinpoint what side the noise is coming from, should i replace both sides?
Nov 10, 2007 at 1:42 AM
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PHINNANT
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check the grease in the differential in the front if it gets low you will have a clicking noise
Oct 11, 2008 at 5:42 PM