Not sure I understand the problem, are you saying the tires are leaning (toward the vehicle) in at the top? Or that the tires lean out at the top?
A little positive camber (tilt out at the top) is normal in most vehicles. But I'd start by making sure what you are seeing is not caused by something being loose. Don't believe the camber on an M38 is considered adjustable.
Several overall components have an effect on toe in or out, negative or positive caster and negative or positive camber. Read a little on all to understand what each one does and the effects that it has on drivability.
Tie rods, ball joints, king pins, bushings, wheel bearings, all have an effect on the geometry of setup on the wheels, steering.
Bent, broken, loose, distorted, worn components, and many other symptoms have an effect on the visual appearance of your tires.
So a little more information is needed to try and understand what you may be seeing. Pictures also help, some times illusions are seen in daylight, night, shadows, the way the truck is parked, backing up then parking and the front tires seem to be pointing in towards themselves from looking from the front.
We need a little more information and possibly read a little in the TM's for applicable information.
This so difficult to perceive..12 to 5 o'clock lean??.. That is some 30*...
As mentioned before, post a picture, or describe the 'Lean' as you would to someone without a clue as to what YOU Perceive.
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