Azv

Oh and its 2wd

So Here's the issue. If the back tire's spin "burnout" even slightly like if say it was wet out and I leave from a dead stop. My truck 100% of the time will pull really hard to the right afterwards and one of the two rear tires will lock up and release over and over then randomly the truck will go back to being just fine. I can hit big bumps, drive on the highway, do anything and its fine. I've checked the diff and put new fluid in. leafsprings are fine i can easly turn the tires by hand. no noises either. any clues?? also when the truck pulls right its a way harder pull then just a draging tire.

Ok so I ended up finding that one of the 2 bottom bolts on the front right shock were gone. it was shifting. I put a new bolt in and so far the truck has not done it again after a few hours of driving. but I have a new loud clunk noise on the front right so I'll be sure and check out what ya'll have said. Again thank you for the help!

Ok will do. Thank you both btw

So I just went out and checked everything and nothing seems out of the ordinary. leaf springs and all bolts and shackles are good. not even any rust.

So I am beyond confused. My truck is a 99 gmc sierra 2wd. If i hit a bump 1 out of 50 times my truck will go from completly aligned to pulling hard right. when this happens it'll pull hard right until i hit the next bump in the road then suddenly go back to being perfectly fine. I also noticed today if I spin the tires "burnout" trying to leave a parking lot or something. it will 100% of the time pull hard right after. it then corrects it self if i hit a bump it the road...