I know a little about working on motorcycles, but I am first time attempting to do a simple change of shocks on my '52 3/4 ton Chev soon. I was wondering, do I need a spring compressor or will they slide right on if I have jackstands under the frame so the suspension hangs free? Also, I suppose I have to wait until I can get my hands on a impact driver to get those shock nuts off? I have already sprayed them with break-free fluid (coon [censored]) to break the rust up, they are the original shocks on there!