Thunk upon stop and acceleration.
5 Year Member
Joined: Apr 2013
Posts: 6,135
Likes: 885
From: New Orleans, LA
Wayne
Last edited by Z7What; Nov 20, 2014 at 08:37 AM.
King Hater
Joined: Dec 2013
Posts: 6,973
Likes: 874
From: MONTANA
Junior Member
Joined: Nov 2014
Posts: 5
Likes: 0
From: Texas
I have a brand new 2014 4x4 Crew Cab with 6.5' bed and mine is doing the clunk or thunk exactly as you describe! I brought it back to the dealer with less than 1000 miles. The Service Advisor and the Mechanic were able to replicate the problem and then proceeded to relubricate the U-joint. It did not solve the problem. Once they realized they could not correct it, then they began describing it as "normal". I had such high hopes and Ford prides itself on quality. I saved for this truck for years and now I hate it when people ask me how I like my new truck. I don't know what else to do.
Ford Customer Service
Joined: Oct 2010
Posts: 3,736
Likes: 808
From: Dearborn, MI
I have a brand new 2014 4x4 Crew Cab with 6.5' bed and mine is doing the clunk or thunk exactly as you describe! I brought it back to the dealer with less than 1000 miles. The Service Advisor and the Mechanic were able to replicate the problem and then proceeded to relubricate the U-joint. It did not solve the problem. Once they realized they could not correct it, then they began describing it as "normal". I had such high hopes and Ford prides itself on quality. I saved for this truck for years and now I hate it when people ask me how I like my new truck. I don't know what else to do.
Brittany
Senior Member
Joined: Oct 2013
Posts: 968
Likes: 232
I have a brand new 2014 4x4 Crew Cab with 6.5' bed and mine is doing the clunk or thunk exactly as you describe! I brought it back to the dealer with less than 1000 miles. The Service Advisor and the Mechanic were able to replicate the problem and then proceeded to relubricate the U-joint. It did not solve the problem. Once they realized they could not correct it, then they began describing it as "normal". I had such high hopes and Ford prides itself on quality. I saved for this truck for years and now I hate it when people ask me how I like my new truck. I don't know what else to do.
Junior Member
Joined: May 2018
Posts: 2
Likes: 0
A week and a half ago I purchased a really nice 2012 F150 XLT Supercrew with the 5.0 Flex Fuel V8 with 82,000 miles. When I test drove the truck I noticed the "clunk", but did not pay any attention to it. Now that I've owned it for a few days, I kept wondering what in the heck the noise was. Today I joined the forum specifically for the purpose of trying to determine what the "clunk" noise is under normal acceleration. Now I'm really glad I joined because the descriptions everyone has posted certainly seems to be the exact problem I'm having. Next week I'll have the spline greased and hopefully, this will cure the problem. Thanks very much everyone. Dennis
Junior Member
Joined: May 2018
Posts: 2
Likes: 0
Wow, what a great forum! I did exactly what was suggested; grease the spine with a heavy duty grease. Actually I had it done at a local shop. Took them less than 30 minutes. I even supplied the grease. Now the clunk is gone. Thanks to everyone who said to grease the spline. Dennis