Sharp clunk from transfer case when shifting into 4x4(esof) - Ford Powerstroke Diesel Forum
 
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post #1 of 3 Old 10-22-2012, 08:56 AM Thread Starter
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Sharp clunk from transfer case when shifting into 4x4(esof)

If I lock the front hubs and drive, shifting into 4high results in a sharp clunk from the rear(ish) area of the truck. Is this the transfer case? I recently greased the front hubs and I can feel them engage smoothly. Problem is, when I switch off 4high, the system stays engaged until I slow to about 20mph. Then it all disengages. It's a 450 with auto and esof. Hoping to get some input before I drop it off at the dealer for some troubleshooting. Hoping for the best.
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post #2 of 3 Old 10-22-2012, 04:56 PM
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They are definitely super slow to disengage, check your lines for vacuum leaks may help this process speed up but I believe the pump runs for almost 60 seconds at times, not sure how long they estimated the actual engagement/disengagement should take.

Click from the rear would depend how far back, could be transmission, u-joints, rear end, anything that moves as you go back. Can you get a buddy to help you by doing the shifting if you are underneath it and figure out where it is coming from?

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post #3 of 3 Old 10-22-2012, 05:21 PM Thread Starter
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I'll start checking around. Forgot to mention the aforementioned noise is speed dependent. The fast I am going, the louder and more harsh it is. The manual claims that 4x4 engagement can happen up to some 45mph. If I did that, I swear it sounds like the tc is going to grenade. It's been so harsh in the past that the whole truck has jumped. And this is a f450. Couldn't get it to the dealer today but I'll update as I can. I will say that greasing the auto hubs definately makes a difference. Super smooth to engage, just don't know what that reward smacking sound is.
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