Start by putting a jack under the axle housing on that side and lift the wheels off of the ground, then yank the wheel around and note if there's a lot of free play in the bearings, the seal can't do it's job if the bearings are "loose".
Truck wheel bearings need a little (.003" or so) free play and NEVER preload.
If the free play is a lot greater than that you need to take an extra close look at the bearings when replacing the seal to see if that are failing.
I agree with Cat Guy that Stemco seals are the cat's meow, especially for an over the road truck that see LOTS AND LOTS of miles, if yours doesn't see that kind of service good quality OEM-style wheel seals from a good supplier such as SKF or National will be just fine.
No matter which style you choose you need to get the correct one for the application, also it needs be noted what style of wear sleeve may be on the axle, some OEM sleeves are thin like a SpeediSleeve and some are THICK and special to the application and it's not always easy to source a replacement. Or someone may have stuck a SpeediSleeve over whatever is there/
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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