Strange Noises (tranny?, transfer?)
 

Ok So, I'm in the process of saving up and purchasing Under-Drive Pulleys and a Custom live tune from PHP. But, before I get any of that done I am trying to diagnose the noise issue I am having. I have recently replaced the U-joints, checked the rear differential, and replacing fluids with synthetic RP. The noise is a thump-thump-thump-thump-thump you can hear it only and best at low speeds say 28 and under, out of the throttle when coasting, noise almost disappears when put into neutral. I am in the process of becoming an automotive tech but am having issues diagnosing this issue and it's really worrying me. I have taken it to the local Vernie Jones Ford dealership but absolutely will not return there. They always give me the run around and don't want my business. Absolutely drives me crazy. I'm thinking I caused this issue from when I first got the programmer I turned the shift pressure up high. Anyone deal with this or have any ideas?

That noise would worry me also!

What kind of adjustment have you done with the evo and tranny?

Any vibration inthe driveline or steering wheel?

Lars

You can't really change the shift pressure with an Edge or a Gryphon. All you can change is the time it takes for the clutch to lock up during shifts (shift firmness).

Thump-thump doesn't sound like a transmission issue to me anyway. What it DOES suggest to me is a bad CV joint. Does the sound get more noticeable during a turn? I THINK you have a 4x4 - have you looked at the driveaxle boots? If they're cracked or otherwise damaged, I think that's the problem.

- Jack

To begin with I turned the firmness up high, but later learned it wasn't the best idea.. It's not turned down, way down.. No vibrations in the steering wheel other than it's slightly out of align, haha... Yea, this noise have bothered me for quite sometime.. it's just now getting a little louder...

* JACK AND JANET *

It stays the same if I am going straight or in a turn... I have read about the front not disengaging correctly but I just haven't ruled anything out other than U-joints and Gears.. I'll research the front drive components today. By the way it only have 67,000 miles on everything...

Thanks for the help guys...

If you have a lift kit? Start checking some of the components of the kit also to make sure the driveline isn't binding or rubbing.

Lars

Will do! I am leveled out with a 2.5 Daystar kit... Thanks a ton...

Checked the entire front components... The drive boots look brand new so unless it's internal the CV's looked perfect.. The one thing I did notice is marks on my coil spring but I believe they are there from when I have had it on the lift at work and school and the A-arm drops down onto the spring and caused a little mark.. That was all I could find up front. The steering looks great, the front chunk is spotless.. How exactly do I check the angle on the driveline to tell if that is my noise?

You have a lift!
Put the truck up on it if its a 2 post and turn every wheel by hand and you or your buddy go around and listen. Do you have a yolk bearing support on the drive shaft?
Check the wheel lugs.
Do you have access to a dyno? If you do just put it on there and go for a drive and have your friends listen also.
I am running out of ideas!

Lars

I will try to put it on the lift tonight.. Need to rotate the tires anyway.. Only thing done to the drive shaft from factory is that I have Dana/Spicer U-joints instead of factory.. Yea, I have run out of ideas as well.. It's driving me nuts..

While you got those tires off check the balance. Check the lug pattern in the whell and studs. Check the brake components.


Lars

While you got those wheels off check the center caps for cruel humor debri, like rocks, bolts, or nuts.

Lars

VERY GOOD CALL!!!!!!!!! There is a huge huge possibility of that.... I came out of my apartment to find a Matress in my bed and my wipers and mirrors are folded in all the time.. Gah, as mad as I will be I will have to laugh it off..

I just replaced the brakes 5,000 miles ago with rotor pros slotted and drilled rotors.. I thought I may have dropped a shoe inside the drum/rotor but didn't.. My axles are held in by a C-clip inside the chunk housing right? It couldn't be it...

Ok so, I went through everything again tuesday night and still couldn't find anything.. Today, I decided I had listened to it long enough so I went straight to the service manager and after he rode with me he seems to think it is an inaccurate backlash in my gears and that there may be a gear that isn't in good shape causing too much clearance (shouldn't be any more than .015 he said). So, after pricing the fix to do it myself I am going to call and see what the ford place will charge to do it with a warranty so if it ever comes back it'll be on them to fix it. I'm praying that's the noise and hope it goes away.. I'll keep this thread informed so if anyone else discovers this they won't have to search and hunt like I have.. I just smiled when he said there is no way it's your trans! :woot:

Well so much for fixing the rear-end... I had someone break my passenger glass and steal my ipod plus a girls purse.. So, needless to say my glass, tint, and ipod will come before the rear-end but at least I know what is making the noise now...

Sorry to hear about this! I don't really know what we have to do to get this kind of stuff under control, but SOMETHING needs to be done!

- Jack

Sorry to hear about the break in. :cry-blow:
I always tell my wife to keep the purse down on the floor with a blanket covering it. Out of sight out of mind.
Glad you found the noise source!

Lars