Michelle
Well-Known Member
- Thread starter
- #61
Yes! This describes it perfectly... it’s like a clunk as if someone hit my truck from behind. Thank u for your reply. I will show this to the service department at Ford^^ This
OP, in your original post you didn't mention but does the clunk happen after you come to a stop and start to ease up on brake pedal? If so, it's the dry spline issue Ranger33566 mentions. I had it on my previous truck, a Tacoma. Pretty common on trucks with automatics, and pretty annoying too. Here's a copy and paste from another forum which explains it pretty well:
Its a result of differential wrap up. Automatic transmissions only. Here is what is happening. As you brake, the differnetial tries to roll forward, as the rear shoes are attatched to the rear axle. So it rolls the diff forward, the pinion nose dives down and the slip yoke on the driveshaft puls apart, then you apply the brakes. But with the automatic transmission, the "load" is still on the slip yoke because an automatic will keep applying pressure ot the driveshaft. So the bind on the slip yoke in the extended position holds the rear diff "wrapped up" and when you release the brake, it unwinds and gives you the affect you just got lightly bumped buy a car behind you. Does this sound right? Add more grease to the slip yoke.
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