Need Help on GMC:

[conoverbandit]

Hello,

I have a 71 GMC 3/4 ton truck,2wheel drive, and I need to replace the upper a-arm bushings.THey are kinda like a "big nut"? i guess that screws off ,at least that's how tha one's they gave me at the parts house look, but no one around here can tell me how to put them on.My question is this, do you jack the truck up to take the weight off the a-arm and then take them out,or do you leave the truck on the ground and do it that way? I hope it's just the bushings and not the a frame it's self, on the pass. side the wheel assy. will move foreward and back a good bit.I think this is what it does when I go around a curve to the left. When I do it get a really bad vibration. Thanks,