1997 Chevy S-10 Squeeking sound

There's a squeeking sound somewhere in the back of my truck and as I accellerate the squeeks go faster. After couple of minutes, it'll go away. I noticed this only happens in the morning or when when the car haven't been running for more than 2 hrs. I put the truck on jackstands and supported the rear axle on a floor jack and put it in drive and no squeeks found. Previous owner removed 1 leaf spring on both sides, would that have to do with the noise? I'm still guessing its on the driveshaft or rear differntial. Thank you for your help.