Strange rear-end "thud" when easing off brakes...?

[Blue&Black]

The thud happens more often in 4A and the hard downshift at low speed happens more often in Sport mode.

Still haven’t figured out the rhyme or reason to why it shifts hard out of Park on some rare occasions, since I e-brake then shift to Park every time before parking.

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[WuNgUn]

Are y’all all Sas or non?

Squatch

 

[WuNgUn]

The thud happens more often in 4A and the hard downshift at low speed happens more often in Sport mode.

Still haven’t figured out the rhyme or reason to why it shifts hard out of Park on some rare occasions, since I e-brake then shift to Park every time before parking.

Jeez...it better not be a transmission issue.
I was almost thinking u-joints but it would be all the time.

 

[Ducati1098]

Jeez...it better not be a transmission issue.
I was almost thinking u-joints but it would be all the time.

There are no u-joints either, but it does sound like one going bad.

 

[Jazer]

Weird. 7k on my OBX and I have never experienced this.

 

[tn3sport]

differential clutch.... outside of tolerance....
But, I don't know anything about the Ford e-locker. What you are describing is typical of a limited slip differential clunk. the e locker is likely magnetic and might not even have a clutch. Assuming it did, it clunks when it engages/disengages when out of spec. i.e. shims...

 

[Razorbak86]

differential clutch.... outside of tolerance....
But, I don't know anything about the Ford e-locker. What you are describing is typical of a limited slip differential clunk. the e locker is likely magnetic and might not even have a clutch. Assuming it did, it clunks when it engages/disengages when out of spec. i.e. shims...

Good reference info posted by @Rocketeer Rick …

M220 e-Locker Differential Deep Dive Overview

 

[Brockdog12]

I wouldn't even know how-to begin to describe it to a service advisor. Lol

Make them road test it with you.

 

[Brockdog12]

Mine is an all stock OBX. 8800 miles, noticed this issue recently. Could be a rear end issue, but to me feels like hill assist letting go. Anyone have a GoPro they could mount pointed at the differential area and test drive? Maybe see what’s happening externally when letting off the brakes.

 

[Ford Motor Company]

Happening to mine too. It’s so annoying. I’m glad I’m not the only one. Sometimes it’s so noticeable that I look behind me to make sure no one tapped my rear bumper. Going to a second dealer on Wednesday to check it out. First dealer said NPF and blamed it on a lift. It was doing it before the lift so I know for a fact it’s not caused by that.

Hi there! Will you send us a message with your VIN and your local Ford dealer? I can look into things on my end.

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