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I went to pull something with my truck yesterday in 4- wheel low. It wouldn't go into 4-wheel low only 4-wheel high. I hadn't really tried it since I bought the truck in February. Well I did put it in 4-wheel low before in the drive way to see if it would "jump" like my 97 would. It didn't. My 97 F150 felt like it would pull the house down.
No I think it was in park. I cranked the truck switch to 4 high then to 4 low, I then put the truck in reverse and actually moved it a little, moved to neutral, pause; moved to drive, actually moved it a little; neutral again. Pretty much all over the map. But no, I don't think I started in neutral. In my old truck shifting to neutral and backing up sometimes seemed to make it engage.
Hell, I'll try it. I owned and operated the other truck for 8 years without reading the instructions; I guess I thought I could do that with this truck.
Like you said, I put the truck in neutral first then switch to 4-wheel low. It worked like a charm. I punched it and it "jumped." Felt like I could pull the house over (figuratively speaking).
The neutral thing is good to know, I tried it the other day and it made a god awful clunk, I bet neutral will fix that problem, patience is something that I am not good with, so I may have had to wait longer
I just watched a video from Flatrate tech that described how the 4WD works. In the video, they mentioned waiting 5-7 seconds for the tranfercase and the hubs to lock in. The hubs are apparently vacuum operated and the t-case is electro mechanical.
There is a hesistation before it plops into low. Then sometimes a hesistation getting out. Put it in neutral, reverse, drive just to switch things around. You can hear it go into low and out.