Acceleration "bump" or "shudder"
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Junior User
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Acceleration "bump" or "shudder"
Hey,
I have a 2004 FX4 SCREW with 40,000 miles. I am experiencing a shudder or bump when I moderately accelerate from a stop. I was convinced it was the driveshaft slip-yoke until I read complaints about the torque converter lockup clutch wearing out and causing the shudder. My question is, which one am I experiencing? The truck has done this since I bought it a year ago. I didn't notice it at first. I already have to schedule an appointment to have the rear diff repaired due to "Whine", and I am a bit disappointed with this annoying shudder, or bump.
Thanks in advance, Matt
I have a 2004 FX4 SCREW with 40,000 miles. I am experiencing a shudder or bump when I moderately accelerate from a stop. I was convinced it was the driveshaft slip-yoke until I read complaints about the torque converter lockup clutch wearing out and causing the shudder. My question is, which one am I experiencing? The truck has done this since I bought it a year ago. I didn't notice it at first. I already have to schedule an appointment to have the rear diff repaired due to "Whine", and I am a bit disappointed with this annoying shudder, or bump.
Thanks in advance, Matt
Senior User
Joined: Aug 2003
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Does it feel like your hitting the rumble strips on the highway? Also does it do it when you turn left or right when accelerating?? And last do you have Posi in your rear diff? Have them check out TSB 06-4-4 (LIMITED SLIP AXLE CHATTER, SHUDDER, BINDING SENSATION OR VIBRATION DURING LOW SPEED TURNING MANEUVERS. I had the same thing as you had last week and it was all fixed with replacement of clutch packings in the rear end. Have them replace the seals at same time. i did that and it cost me an extra $60 on top of my ford esp deduct. WELL worth it....
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Junior User
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I have greased it up twice. Seemed like it was a temporary fix. What type of grease did you use? I may be using the wrong type. Thanks
Cargo Master
Joined: Apr 2006
Posts: 3,215
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From: WV
Hmm... if that fixes it temporarily then it sounds like the right thing to fix, but it should last a while. How long has the fix been lasting for you?
As for the kind of grease, all the manuals and such say to use Motorcraft PTFE Lubricant. So, I went to my "local" dealer and tried to buy some and they said that they don't use that there, they just go to NAPA and buy any brand of "good" grease
So, since I was in a hurry and the next Ford dealer was another 40 minutes away, I got some Valvoline Durablend. It fixed my "thump" on takeoff and so far its holding up (only about 7 months so far though).
In another thread on here, FTE/PARTS-GUY (Ed) posted the Ford part number of the grease is D2AZ19590A and he probably sells it.
Good Luck!
Jason
As for the kind of grease, all the manuals and such say to use Motorcraft PTFE Lubricant. So, I went to my "local" dealer and tried to buy some and they said that they don't use that there, they just go to NAPA and buy any brand of "good" grease
So, since I was in a hurry and the next Ford dealer was another 40 minutes away, I got some Valvoline Durablend. It fixed my "thump" on takeoff and so far its holding up (only about 7 months so far though).
In another thread on here, FTE/PARTS-GUY (Ed) posted the Ford part number of the grease is D2AZ19590A and he probably sells it.
Good Luck!
Jason
Postmaster
Joined: Nov 2004
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From: Marion, VA
Does it feel like your hitting the rumble strips on the highway? Also does it do it when you turn left or right when accelerating?? And last do you have Posi in your rear diff? Have them check out TSB 06-4-4 (LIMITED SLIP AXLE CHATTER, SHUDDER, BINDING SENSATION OR VIBRATION DURING LOW SPEED TURNING MANEUVERS. I had the same thing as you had last week and it was all fixed with replacement of clutch packings in the rear end. Have them replace the seals at same time. i did that and it cost me an extra $60 on top of my ford esp deduct. WELL worth it....
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Junior User
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Thaks for all of your help. Looks like I will give it another try with the grease. When it's warmer of course!
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Senior User
Joined: Oct 2008
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From: Denmark,WI
i had the clutchpack prob...it was under warrenty tho
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Junior User
Joined: Aug 2005
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The TSB states the nickel coating may have worn off of the yoke. In that case, you have to replace the whole driveshaft. The grease lasted maybe a week for me. I used Lucas grease. I would like to try some that is Moly fortified like the durablend though.
Cargo Master
Joined: Apr 2006
Posts: 3,215
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From: WV
Its the "joint" on a driveshaft that allows for compliance of the driveshaft length as your suspension travels. There are splines on one side and an opening with matching splines on the other part. Hard to explain in words I guess, below is the one on my F250. If there's insufficient grease in there then it will feel like a bump or a thump on takeoff... hope this helps.
Edit.. that second pic is how it looked when I removed it, not after I greased it
More pics here: 2004 F250 Slip Yoke Service
Edit.. that second pic is how it looked when I removed it, not after I greased it
More pics here: 2004 F250 Slip Yoke Service
Senior User
Joined: Dec 2003
Posts: 476
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From: Virginia (Northern)
Does it feel like your hitting the rumble strips on the highway? Also does it do it when you turn left or right when accelerating?? And last do you have Posi in your rear diff? Have them check out TSB 06-4-4 (LIMITED SLIP AXLE CHATTER, SHUDDER, BINDING SENSATION OR VIBRATION DURING LOW SPEED TURNING MANEUVERS. I had the same thing as you had last week and it was all fixed with replacement of clutch packings in the rear end. Have them replace the seals at same time. i did that and it cost me an extra $60 on top of my ford esp deduct. WELL worth it....
Senior User
Joined: Aug 2008
Posts: 298
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From: Vicksburg, MS
I had the same problem (whine when running and shudder at takeoff) at 35K. Ford replaced the ring and pinion, bearings, and clutch pack. I changed the fluid after about a thousand miles or so to get the break in oil out. I used synthetic Valvoline and friction modifier. At 74K it seems to be fine.
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