I have an 03 super Duty, XL, 4X4 PS. It has manual locking hubs, and the shift lever on the floor. My buddy has told me all i have to do is shift into 4WHEEL HIGH, and only lock the hubs when i need 4
WHEEL LOW. Is that correct or do I have to lock the hubs manually all the time?

 

Your buddy must be a chevy driver - he's got it all wrong. You need to lock the hubs whenever you use 4x4, low range or not.

 

Na he is a ford guy all the way maybe just not to bright. He is not an electrician just a plumber.

 

He'd be partly right if you had electronic shift on the fly... Then you don't need to lock the hubs manually unless the vacuum system malfunctions. For a truck like yours with a lever, it's get out and turn 'em in when you are going to be needing 4x4.

 

no, you need to lock your hubs!

 

Plumbers make quite a bit of money doing things others wont....pretty smart if you ask me. He just needs to read his owners manual for that truck...