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So I have a 1999 Ford F250SD XLT 4×4 that won't go into 4-wheel drive low. It's a manual shift 4×4.

What can cause this?

When I put it in 4-wheel drive high, the 4×4 dash light comes on but it doesn't seem to be working.

  • You should probably check the vacuum lines to the hubs there will be a solenoid somewhere in the engine bay that get's vacuum from a reservoir and then passes to the hubs. – Ben Feb 25 '16 at 21:50
  • I've had the same issue in s 4x4s. Vacuum lime all three times. – DucatiKiller Feb 26 '16 at 5:28
  • It could be a problem with your transfer case. I just rebuilt one I'm my Jeep that was having similar issues. The shift forks were worn out. There was no grinding noise either like you'd expect. – JaredW82 Feb 27 '16 at 7:50
  • Have you ever serviced your transfer case? Have you checked the fluids in it? Is there a lot of metal in the fluid? – JaredW82 Feb 27 '16 at 7:54

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