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I bought my brother in law's 1996 f-250 4x4 and if u drive in high range the trans works perfect. If u put it in 4 wheel drive and put it in drive it won't shift into 2nd gear unless u manually put it there. if u put it in first then 2nd it's ok until u put it in drive and it go's back to 1st . Any idea's. david
 

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Does it have stock size tires? Is the speedo correct?
Neither of those will cause this.

There is an input to the computer that tells it when the transfer case is in 4x4 low. Yours is not getting that signal. It is waiting for the truck to get fast enough for a 1-2 shift in high range. That's not going to happen in low range.

I don't have a wiring diagram to be able to help you find the exact wire.
 

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Should be a Light Blue with Black trace wire to pin 14 on the PCM for the 4x4 Low indicator. Cheers!
 
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