I have a clunking noise when my truck shifts down into 2nd when coming to a stop. The truck has ato transmission, which Ford replaced, this did not correct the problem. They have inspected the rear diff. and replaced the drive shaft to no avail. Ford acknowledged the noise and has now takng the stance that this is normal!
Other facts, the noise is definitely coming from the rear/driveshaft area. It can also be heard when you slow own then accelerate forcing the transmission to shift down into second. Sometimes a significantclunk can be herad when you let off he gas to coast. Overdrive on/off does not seem to make a difference.
Fords answer is to offer me an extended warranty, I want the noise fixed!
Any thoughts??:

 

Some say it's the output shaft yoke that needs grease. Could also be the U joints. In my case, the clunk I had would come after slowing down and then accelerating or coming to a stop and then starting again. Another thing I noticed was that it didn't do it when I had a load in the bed. Only when empty.

Well, I ended up getting some Hellwig progressive overload springs to cure the problem of my truck not being able to handle any weight. It would almost bottom out on the bump stops with only 1000#'s in it!!

Anyway, the clunk has completly stopped now. Even empty. I also don't have anymore wheel hop. And I can actually load 1000#'s in the bed and it only drops 2" now!!

Has somehing to do with the leaf springs I suspect. At least it did in my case.

Good Luck

 

I have had this problem since day 1 of owning my truck (99 XLT).

I have been back to the dealer several times and got either "we can't hear it, normal operating condition" to " yes we hear it but we cant figure it out". The last time was about 6 weeks ago and thet claim they put 2 hours into it and foung a loose control arm bolt but hte clunk is still there same as before. I believe they did nothing and chared ford for it anyway.

If anyone finds a solution to this problem I would be very happy. I will look into the spings.

I was looking at the active suspension system I saw somewhere on here some time ago.

hobbit

 

I thought about those active suspension units too. Just decided to go with the ones I got. Here's a pic of them.

Like I said before, these fixed my clunk, but that was just a bonus. I really needed the overload springs anyway.

good luck

 

I had a 2000 f150 4.6 with the 3.55 open rear. Made the same nosies yall are talking about. It ended up being the carrier bearings in the rearend. You have to be stright to the point with the service people, i told them what mph it would do it, between what gear shifts, and told them to check the rearend cause that was where it was coming from, cause they tried at first to say it was the tranny. When your carrier bearing comes apart it acts just like a bad u-jiont you get alot of slack movement in the rearend case, and i think this is what is happing to you. Well hope i sheaded somelight on the matter for you, goodluck, and make sure they pull the rearend cover off cause if its a carrier bearing youll have metal shavings in the fluid

 

How many miles did you have when you discovered this problem?

Thanks,

hobbit

 

i noticed it arround 18k-20k went and had it fixed at the local dealer, then about 6k after that began doing it again, but i traded out of my RCO into a perchase on the 2002 i have now. I never really gave the gears time to break in though after it was fixed and from the day i got it back from ford i started towing my car and trailer out to the track, car and trailer was a little on the heavy side at 6600lbs, and beleive it or not the 4.6 did great except up hill.

 

mine does the same thing, see vehicle description below.

 

I had a clunking with my 93 F150 and I found badly worn leaf spring bushings and bolts. I removed the springs and had new bushings pressed in, reinstalled with new bolts/nuts and my clunking was history.
I was told by a Ford tech that the problem was "probably" rear axle bearings. I replaced those but didn't solve my problem.
I went under the truck with a pry bar and put it between the leaf spring forward attach braket (frame) and the forward leaf bushing. I applied pressure and the leaf "popped" and made the exact same "clunking" sound I had been hearing / feeling while driving.
I pulled the springs and took to a spring shop.
They re-arched the springs, pressed in new bushings, and added an additional leaf to each side, and supplied new bolts / nuts for $150.00. Removing the springs was simple, and the shop did the work in about 4 hours. So about 6 hours and $150.00 later my problem was gone.
Hope this helps you.

 

I have a 99 F150 and experiencing the same problem, (8 months and counting). When I take off slowly from a stop or after slowing down either for traffic or to make a turn I here and feel a clunk coming from the rear end. I have taken the truck to the dealership over and over again. If you had the diff inspected and the rear axle replaced what else is there that includes the drive train (which is where I believe the problem is)? My drive shaft is fine and so are my u-joints. I'm so frustrated with Ford and having an ESP with them doesn't make it any easier. More and more F150 owners are posting notes about this type of noise and it seems to me that sooner or later Ford is going to have to fess up and acknowledge that there is a problem. Maybe I'm just dreaming!!! I hope someone will finally get the right answer from Ford so the rest of us can get this problem resolved once and for all.

 

I have a 2001 supercrew 2WD, 5.4L. and LSD. My transmission got replaced at 860 miles because of a noise downshifting into second gear at about 15 to 18 mph, service department transmission "expert" said that it was not normal so they replaced it. Wel the noise continue after that, than they said they did not know what it was and ford was researching on the problem, they also tried replacing transmission tail housing, regreasing slip yoke and reprogram computer with no fix. Other dealers said, some trucks do it and some do not. I went several times to different service departments at ford dealers and the answer is, "it's normal" or "we don't know what it is" or "we did not hear anything" or "we will not work on it unless is completely broken" or "is the brakes" or "is the suspension shackles" and they just do not care if you have problems and concerns. My transmission clunk got worse specially in the morning before tranny gets warmed up and sometimes it really slams into second gear downshifting from third gear and I do not have slam gas pedal either. Most everybody that rides in my truck notices the noise right away. I'm just very dissapointed with this truck and ford and dealers because on top of transmission noise I had several other problems with truck. I know the noise is coming from transmission, I just do not know why.

 

I have a 2000 F150 Excab Longbed with 5.4 and the AOD R70W tranny. I just had it bulletproofed by Level 10 performance transmission specialists. I had my shifts made more firm. Previously, I had the "clunk" when coming to a stop..now it is a bit more pronounced. I called and found out that the R70W's are notorious for the 'clunk'. I learned that the harder your shift is...the more pronounced the 'clunk'. In my case, it won't be a problem because of the new bulletproof nature of the tranny.
Problem in the sense that it's not going to break...but it IS annoying! ... I can live with it though because this tranny upgrade is definitely going to help me post much faster times.



One of a kind