Duff

Hello -- We are looking at an older Toyota RV with the bad axle (85). Fortunately, we have a parts truck with the full floating axle. I hope you guys can help us with a few questions. 1) Is the full floating axle a bolt-in replacement for the old axle? or are modifications necessary? 2) Is the full floating axle the same gear ratio as the old axle? (My parts truck is an '86 or '87 with the 4 cylinder and automatic.) 3) What is necessary to also mount the 6 lug wheels on the front? Thanks! Duff