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@denis Laouenan not sure about in 4X4 Low, probably not. @Brandon-w knows this transfer case and how it works really well.
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Slipped enough to go down the ramp...That is the Borg Warner 44-44 transfer case. Even though the setting states 4X4 Lock it doesn't engage the front wheels unless slippage is detected.
If you are referring to the crash in Sioux City, your statement is completely false. The "single part" was the entire turbine fan section of the #2 engine. Yes, it did take out the hydraulics, but Al Haynes and his crew managed to get it to KSUX and onto a runway, without any conventional controls. The mere fact that they made it to the airport at all was a miracle. 185 survived and 112 perished, but without the incredible airmanship and CRM in that cockpit, no one would have survived. Studying that crash was part of my training and how to utilize CRM.McDonnell Douglas did this with the hydraulics on their infamous DC-10 planes where a single part failure resulted in the plane going down and the deaths of everyone onboard.
If your transfer case has the 4 auto option the front wheels are not engaged while in park.The question is really does 4wd remain engage in park, so all 4 wheels offer rolling resistance. Since the mechanic transfer cases with levers, I don't know if this happens in park. It's a crapshoot. It would not be hard to test with a floor jack and spinning the front wheels though as the park pawl will default to the rear.
The same thing would also happen in drive without throttle application, in the stock configuration the clutches do not lock 100%.In the OP's original issue. The tires slid on the wet ramp it would not have mattered what he did.
When he put that truck in park it disengages the 4wd system so there is no braking on the front drive train
as a conventional 4wd system would have provided.
Sorry for my lack of knowledge, something I find important when towing a boat to the ramp is what happens to the 4X4 when you put in park and leave the truck to go get your boat on the trailer. I fear that in park only the rear wheels are locked regardless of the 4X4 selection and leaves you with braking and locking only to the rear wheels, those that happen to be the most on fouling weeds etc. If the rear wheels loose grip and you are not in the truck to push the brake pedals you're done. I boat mostly alone and I don't have someone staying in the truck while I steer the boat on the trailer. Thanks for your input.