Mike, the 3500 frame is physically shorter than the 5500 frame so getting it to fit the four usual jack points (front corners of the footwells, rear corners under the torsion arm ends) is really hard so I catch the front corner points and then run a 2 X 4 across under the car and just behind the dips in the floor pans. the 2 X 4 spreads the weight and I see no pan distortion when lifting.
I would think that the 5500 length would suit the car jack points better IF the frames are run front-to-back on both sides.
Now, if you were to turn the 3500 90º and lift across the pan rather than front to back, you can perfectly pick up the recommended jack points. Makes a lot of sense and I'm STILL wondering why I never thought of that......
Ray, I'll try calling them tomorrow and see if I can get a new set of connectors. Must have belched out a quarter of a quart last time I used it.