So I have my '56 Olds (four door Super 88 sedan) stripped down and ready to media blast. With the car at this stage, I know the best bet is to pull the body off the frame and put it on a rotisserie for blasting and painting. I don't have floor lift or an overhead crane set up, so I was considering using railroad jacks, etc. to support the body and roll the frame out. I know at least a few of you have done frame-off's and I'm curious what your "technique" is? Most importantly, is it necessary to weld in cross supports in a "post" car (sedan) with no doors, glass, etc?
Get 3 of your biggest strongest friends and four 55 gallon drums. Have a 5th friend to move the cross supports that will sit on the drums and support the body. He will also move the drums into place when you and friends lift the body off of the frame. Take 4 ten foot long 2x6 's and nail 2 of them together to use as cross braces that go under the body and sit on the 55 gallon drums. One set for the front and one set for the back of the body. That's how I did my 49 Buick.
Here's my 46. Disregard the OT modifications. I removed all the body to frame bolts and used solid lengths of timber bolted to firewall feet and rear body under the trunk after I'd raised the body slightly at each end by using an engine lifter. Ensure that the timber or RHS steel is strong enough to take the weight of the body and use larger and heavier industrial type jacks stands than 'El cheapo' parts store variety. As expected practice safe work practices at all times being mindful of that jack stands need to be placed out wide to allow the frame to later roll out from under the body without catching on the jack stands. The heavier stands have a solid foundation with a wider base and are more stable with weight at a height. Next work out where the frame will sit with no wheels as you'll only need to raise the front and rear of the body just enough so the rear chassis kick up clears the floor pan. I'd previously removed the springs which made it a lot easier as I could get the frame low on the bump stops. I then jacked up the frame and removed the wheels lowering it onto the four (4) vehicle positing jacks allowing me to then roll it out from under the body. The vehicle positioning jacks are handy and allow you to easily move heavy objects around. After I took the frame out I put the wheels back on. Using the vehicle positioning jacks I was able to roll the body to the other shed bay. I then rolled the frame back into the other bay where body with frame were originally parked. This was all accomplished single handed without too much of a sweat. A bit fiddly and time consuming in the confines of my 20'x20' shed however it's the only way to do it right. You don't have any obstructions to contend with etc etc. Depending on what you want to do, you can lower the body down for safety as it's more stable at a lower height when working in or under it. When it came to putting the frame back under the body, I just did things in reverse and dropped the frame onto the vehicle positioning jacks to slide back under the body. Job done, beer o'clock.
hears how i did my 54 olds. boat trailers work well for putting the body on and doing work on it. a bunch of cement blocks, 2 1/2" pipe front and back, a good floor jack, plenty of wood blocking and your good. an engine hoist also helps.
The key to using cement blocks to support anything, is to always have a block of wood on the top. It spreads the weight out so you don't have a pressure point to crack the block. Just like 54 rocket 98 did in his pictures.