2005 ford f 150 4x4 should I buy?

This guy has a 2005 ford f 150 crew cab that is 4wd and says it is not going into overdrive don't know that much more then that and it can drive in tow haul. Is it worth to fix up

If you have the possible $ 1000's to spend and if it has verifiable service records, and if you can afford the ( probably ) high insurance, then sure

The transmission rebuild could be $2000

2005 F-150 Super Crew is worth around $8k in good condition. A tranny rebuild will coast between $2-3k.
If everything else is great and he is selling less than $5k, you're in good shape. Anything more, look elsewhere.

If you don't NEED a 4X4, don't waste money on one. They're gas hogs, and need a lot of expensive repairs.