I have noticed, as per some of my other post on here, that there is a weird popping noise coming from something in my truck. Heres the conditions on where its happened

• On grass, accelrating hard, the popping noise occurs. Not just a popping noise, can feel it also.
• Taking a turn and accelrationg hard, will almost 100% cause the popping issue.
• Also, the other day I was recovering a buddy who got stuck, and I had to go over some iffy terrian, well I flexed the rear axle to were my 33x12.50 on the back driver side was off the ground a little, and when I just barely hit the gas, it made a weird noise like something was free spinning inside the axle housing. Im wanting to point my finger at the LSD...

Is this a common issue with these trucks? Anything else to look at? Any help would be GREATLY appreciated.

 

yeah, you can feel the shuddering. The problem is the clutch packs in rear end. It was a common issue with the earlier models, there actually was a technical service bulletin (TSB) issued about this. I had my 04 fixed under warranty per the TSB.

 

test your LSD.

1 tire on pavement, the other tire on dirt (ie: side of highway). floor it


you should get some wheel spin. But if the LSD is working, your 1 tire fire will be minimized and the truck should accelerate fairly quickly.

a bad LSD will just let the tire on the dirt spin away without transferring power to the other tire.



as for the popping sound, try lubing your rear leafs. it's on a 04 F-150 right?...maybe a 05?

 

Yup, 2004. I will try and get a video tonight of the problem at hand. I am really concerned I will do more damage.

 

Spin out on some gravel - immediately stop the truck and go back and see if there are two scratch tracks. If so, your LS is working. The popping noise is usually taken care of with a diff oil change and additive from the dealer - make sure to use only LS oil in it. Did you buy it new? Just wondering if maybe somebody else put the wrong oil in it.

 

My lsd works awesome but it will make noise's some times. Like the rare ocasion when one wheel spins it makes a horrible noise. Mine has never maid a popping noise though. Do what Tylus suggested and see what noises and actions occur when you do it.

 

some of the 04/05's have issues with noises out back...you might actually be hearing/feeling your driveshaft. do a search and look through the TSB's.

 

I saw the TSB for the slipyoke, could that be it? If so, is it something I can tackle in the driveway?

 

Could be the drive shaft. I figured it was the lsd because it only does it when one wheel spins.

 

tsb 04-24-20 (i think this one calls for replacing the clutch packs)
FORD: 2002-2005 Crown Victoria, Grand Marquis, Mustang, Explorer, Mountaineer
2003-2005 Expedition
2004-2005 F-150
LINCOLN: 2002-2005 Town Car
2003-2005 Navigator
This article supersedes TSB 04-17-5 to update the model year and vehicle line coverage.
ISSUE:
Some 2003-2005 Expedition/Navigator, 2004-2005 F-150 vehicles equipped with a 9.75" or 8.8" limited slip rear axle, and 2002-2005 Explorer 4dr, Mountaineer, Crown Victoria, Grand Marquis, Town Car, and Mustang vehicles equipped with 8.8" limited slip rear axle, may exhibit a chatter, shudder, a binding sensation, or a vibration during low speed turns. On 4x4 vehicles, the sensation may appear to be originating from the front axle or the steering gear.


tsb 04-01-06
FORD: 1998-2004 F-150
ISSUE:
Some 1998-2004 F-150 4X4 vehicles with a one piece drive shaft may exhibit a clunking or grunting noise and/or a shudder sensation from the driveline. The condition will typically occur during light to moderate acceleration from a stop and/or braking. This may be caused by the slip yoke not sliding smoothly on the transfer case output shaft splines.
ACTION:
To service, lubricate the slip yoke with Teflon Grease (D2AZ-19590-A). Refer to the following Service Procedure.

 

Thats deff it, it feels like its right under my feet almost.

 

too bad you're out of warranty though. How many miles on your truck? Maybe you can ask the dealer to cover it (or at least partially) since it is a known problem and has a TSB. I've heard of dealers giving a one time freebie repair if just outside of the warranty period.

 

Just recently hit 50k on the clock. I got a buddy who owns a shop and normally only charges me about $20 an hour for labor so Im not 2 worried...

 

does anyone know where I can get the clutch pack I need? Or is it dealer only? If so how much do they normally cost?