Your tires are worn. Get new tires and and alignment. or its a truck, learn to drive with it... seriously
To the right of the gas pedal, behind the center consol.
The 2003 Ford f250 did not come with an air cabin filter. There was a dealer install option but very few were ever put in.
behind or under back seat
Yes they will. As long as it is an f-250 or greater and the a 150. 99-07 are the same pattern. early 99's are different.
1994-2003
They should both be 8x170mm IIRC, so yes. The older ones, pre 96 I think, had 8x6.8" IIRC.
Diesels do not use oxygen sensors
I know that the 2003 ford f250 diesel was what they call the lemon year. They swiched from a 7.3 to 6.0
he drives a Ford f250
Tail lights and brake lights fuse.
A 2003 Ford F-250 column gear shifter can be fixed by simply tightening it again. You can tighten it by turning the adjustment wheel on the lower right side of the steering column.
http://www.acrobatfiles.com/result-97-ford-f250-parts-diagram.html This site covers all years plus they have an "ask the mechanic" service.