Jack up the front end and try to turn the wheels. If it's easier, then look for an issue with front wheel geometry. If it's still hard to turn, take the tie rod that runs from the steering gear box off the left front wheel. Try again. If it's easy now, then you've ruled out a problem with the gear box. Check the front wheel kingpins and see where they bind. Might have to dis-assemble and clean things up.
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