larger tires on my '85 K10 4x4 swb

[Demented]

What's the largest tire you can run on a 1/2 ton pick up without having to change/ tighten the front wheel bearings all the time & or have any front end issues. I currently have an '85 K10 44x4 swb pick up with a small lift. I have 33's on it now & there is a huge gap betweent he top of the tire & the wheel well. I am definitely going with a larger tire to attempt to fill the gap but I am not sure how big of a tire I can run without front bearing & or front end issues. I really don't mud with the truck. It's a daily driver.I bought it with the lift & just want to make it look better. Any information is greatly appreciated.