This happens constantly! Why dont we ever finish our posts? I would assume someone has experienced and resolved most issues we all encounter. I have the same damn issue with drivetrain clunks. Is it slop in the rearend? Bad U-Joints? Upper or Lower CA? Seriously if we would finish these questions the same issues wouldnt need the constant attention
Clunking sounds from rear - 2000 GT
- Thread starter jayrw
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I havent forgot about this thread and will update once I get some answers..
Unfortunately I havent been able to figure out the clunking sounds, I even took it into a shop recently and they couldn't tell me much other than it was a common trait for this type of rear end (?) something to do about clutch packs in the rear and how they sometimes get confused as to which wheel to give power to.. But to me they just didn't know what was going on.
I'm going to call a nearby Ford dealership today and see if they'll check it out .. thankfully I still have some time left on my Carmax warranty im just always so busy with work its hard for me to get my car down to a shop.
Unfortunately I havent been able to figure out the clunking sounds, I even took it into a shop recently and they couldn't tell me much other than it was a common trait for this type of rear end (?) something to do about clutch packs in the rear and how they sometimes get confused as to which wheel to give power to.. But to me they just didn't know what was going on.
I'm going to call a nearby Ford dealership today and see if they'll check it out .. thankfully I still have some time left on my Carmax warranty im just always so busy with work its hard for me to get my car down to a shop.
Ok well my car is currently at the ford dealership for 2 symptoms, the clunking in the rear (Which has been going on for several months), and a newer symptom (About 2 months old) which is a vibration on the floorboard which can be felt during certain RPM ranges depending on gear, for example in 2nd gear you can feel it between 1500 - 2000 rpms and in 3rd gear 2500 - 3000 rpms etc. and if you get on it (floor it) the vibration is even more noticable.
I also mentioned this vibration when i took it to the previous shop and they checked the u-joints / driveline / motor & tranny mounts and said everything was fine and basically couldn't determine why it was happening.
Ill keep you posted (Ford didnt get a chance to look at it today).
I also mentioned this vibration when i took it to the previous shop and they checked the u-joints / driveline / motor & tranny mounts and said everything was fine and basically couldn't determine why it was happening.
Ill keep you posted (Ford didnt get a chance to look at it today).
Rusty67
Dirt-Old 20+Year Member
That 2nd issue sounds like a broken trans mount. The factory trans mounts suck. I put a poly trans mount in mine. They are really cheap and really easy to install. When I took the stock mount out, it fell appart and I don't even have a v8 in there yet lol.
Well I got a call from Ford today saying the tech cant get the car to reproduce any of the symptoms I described (Ugh!) and they asked me to come down so I can road test it with him, During the road test the tech could definitely feel the vibration especially when I would run 2nd gear between 1200 - 1400 rpms (it was still noticeable up to 1900 rpm just not as much).
Now that he knows exactly what im complaining about and how to reproduce the symptom he says he'll figure it out.
But as for the clunking in the rear I couldn't get the car to do it even tho we had drove around for awhile, Perhaps it has something to do with the cooler weather lately, the last 2 days its been in the lower 70's and for months before that its been in the mid 90's or higher.
They asked me to bring the car back Monday morning.
Now that he knows exactly what im complaining about and how to reproduce the symptom he says he'll figure it out.
But as for the clunking in the rear I couldn't get the car to do it even tho we had drove around for awhile, Perhaps it has something to do with the cooler weather lately, the last 2 days its been in the lower 70's and for months before that its been in the mid 90's or higher.
They asked me to bring the car back Monday morning.
My 99 auto with 104K on the clock has never had this symptom, so IMO it is not particular to our cars and is only particular either to 5spd's or people that beat up their cars because they have a 5spd. Any/all of you having this problem ever dump the clutch in first at 4000+ rpms? My buddies 5 speed had problems with his 5spd when it was real cold and when it was real hot out.
Maybe it is only with manual trans...maybe you could not duplicate the sound because of the extra weight (you and him). I just discovered how to duplicate my sound without driving the car. Whil keeping car in gear, I was checking the tightness of my lugs. When I crank down on the front wheels, the car rolls forward slightly. When I reduce pressure the car will settle backwards and clank. Its like there is something in the tranny allowing movement or busted U-joints or slop in the aftermarket gears. I just got my poly trans mount in, but now I dont think that is what is causing the noises and thumps. Keep posting untill someone figures this out!!
Same here, i also have this problem. (80k)I'm no mechanic by no means but after watching horse power TV or something else (don't laugh) they were talking about the drive shaft. Something along the lines in removing the joints and putting in new shims. The old was pressed in and the only way out was to torch it so the rubber melted out. Now the new were pressed in the shimmied in. What stuck with me that they said a clunk sound and low vibrations.If the drive shaft is bent or the joints worn it will cause all of what we are experiencing. It happens to me when i engage first gear from neutral. No shop can determine this unless they specialize in drive lines.
I have the same problem as everyone else. I took it to the local Mustang guru (who also happens to own a transmission shop) and he said the noise is a normal thing. He said to think of it like this, at any given time there may be 15 different gears engaged in the transmission and they might all be in spec. But when you start to add up all the backlash that's when the noise happens.
The cars with auto trans aren't going to make the noise because the gears are engaged thus no backlash, thus no noise.
When you change your rear end fluid with Royal Purple read the instructions it says not to add friction modifier because it is already part of the formula.
The cars with auto trans aren't going to make the noise because the gears are engaged thus no backlash, thus no noise.
When you change your rear end fluid with Royal Purple read the instructions it says not to add friction modifier because it is already part of the formula.
Well they tried cross rotating the rear tires and it reduced the amount of vibration by about 50-60%, I would've never thought it was tire related being the vibration is only felt during acceleration and while in gear, I need new rear tires anyhow (They're right at the tread wear limits) so we'll see what happens.
As for the clunking in the rear I could never get it to happen when they were in the car (I tried again today) and they never heard it during there own road tests .. I guess its not bad enough to hunt down the source just yet. It definitely seemed to happen more often when it was warmer outside but its been pretty cool out recently.
As for the clunking in the rear I could never get it to happen when they were in the car (I tried again today) and they never heard it during there own road tests .. I guess its not bad enough to hunt down the source just yet. It definitely seemed to happen more often when it was warmer outside but its been pretty cool out recently.
My vote is 100% for the differential fluid + friction modifier solution.
Ford had a TSB about this garbage a few years ago. I took my still-new car that only had 15k miles on it in complaining about EXACTLY what you're describing.
The monkeys changed the differential fluid and added friction modifier.
Fast forward three years and the problem comes back. I decide the do the job again and lo and behold, I find that when I crack the differential cover off, only HALF OF A QUART came out of my rear end. There should be like 1.75 quarts in there, i believe. Check your manual.
I filled her back up with the proper amount of fluid, using Royal Purple MaxGear 75w140 and a bottle of Ford's friction modifier.... its like a 3 ounce white bottle.
I haven't had any problems since then, but if you do decide to do the job yourself, may I recommend that you remove the rear sway bar in order to make accessing the differential cover easier? I had an unpleasant experience doing my differential due to the sway bar being in the way. And it was raining
Good luck, PM me for any help I can give.
Ford had a TSB about this garbage a few years ago. I took my still-new car that only had 15k miles on it in complaining about EXACTLY what you're describing.
The monkeys changed the differential fluid and added friction modifier.
Fast forward three years and the problem comes back. I decide the do the job again and lo and behold, I find that when I crack the differential cover off, only HALF OF A QUART came out of my rear end. There should be like 1.75 quarts in there, i believe. Check your manual.
I filled her back up with the proper amount of fluid, using Royal Purple MaxGear 75w140 and a bottle of Ford's friction modifier.... its like a 3 ounce white bottle.
I haven't had any problems since then, but if you do decide to do the job yourself, may I recommend that you remove the rear sway bar in order to make accessing the differential cover easier? I had an unpleasant experience doing my differential due to the sway bar being in the way. And it was raining
Good luck, PM me for any help I can give.
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