Ford pick-up won't shift into 3rd, 4th gear

Hi everyone,
My dad has a Ford pick-up 2001 model B4000 and it has started giving him trouble shifting into 3rd and 4th gears, especially during warm
weather conditions. He can't seem to pinpoint the problem, does anyone have any troubleshooting ideas as to what the problem could be?
Thanks in advance, Larry
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Manual transmission? Automatic Transmission? Miles?
CJB

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CJB wrote:

Automatic transmission.
I'll check the miles as soon as I can.
Larry
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44,000 miles
Larry
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