I have swapped a 1 ton 55 cab for a 1/2 ton 54 cab. No problems at all with mountings. They are identical. To lift the cabs on and off my frame I used my engine hoist by placing a piece of landscaping timber on the boom and securing it with duct tape then placing it through the door openings and pumping it up. Comes up with no problem. Just find the balance point which is closer to the front than the rear. It becomes a one man job doing it this way but it is better to have a spotter just for safety.