35s on 20" rims, do I have to regear?

What gear ratio do you have now? Size of engine, auto or manual? Either way seems like a re-gear would be needed from what I understand. If you have 4:10 might be acceptable depending on what you want to do. But I would think a re-gear would be needed. Also seems like there may be a clearance issue with 22” rims and 35”.