Slight "Bump" Under Braking (Driveshaft Related)

[OCL]

In the last 4k miles I started to get this slight "bump" or a feeling of being nudged forward at low speed when I'm about to make a full stop. Sometimes I feel it when release the brakes from a full stop while in Drive when the truck just starts to move. Definitely driveline related. I looked it up in Google and AI said it's most likely my driveshaft Slip-Yoke is dry and needs to get lubricated. The procedure is to separate the two pieces of the driveshaft so the splines can by lubricated. Has anyone done this procedure or had it done by a dealership? My truck still under warranty but I'm nervous about asking them to do this because they might screw up the reassembly and I end up with a vibration. AI said the two pieces of the driveshaft must be put back in the same exact manner otherwise driveshaft vibration will occur. My truck is smooth as silk at high speed right now and I don't want to ruin that. Any experience from other members? Any wisdom regarding this?

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[Bob902]

In the last 4k miles I started to get this slight "bump" or a feeling of being nudged forward at low speed when I'm about to make a full stop. Sometimes I feel it when release the brakes from a full stop while in Drive when the truck just starts to move. Definitely driveline related. I looked it up in Google and AI said it's most likely my driveshaft Slip-Yoke is dry and needs to get lubricated. The procedure is to separate the two pieces of the driveshaft so the splines can by lubricated. Has anyone done this procedure or had it done by a dealership? My truck still under warranty but I'm nervous about asking them to do this because they might screw up the reassembly and I end up with a vibration. AI said the two pieces of the driveshaft must be put back in the same exact manner otherwise driveshaft vibration will occur. My truck is smooth as silk at high speed right now and I don't want to ruin that. Any experience from other members? Any wisdom regarding this?

https://www.ranger5g.com/forum/threads/how-to-lubricate-your-driveshaft-slip-joint.16648/

 

[Dereku]

Yup lube the shaft. Don’t forget to properly clean it. And be very liberal with the new blue goo. Buy the real ford stuff its more expensive but its worth it. Wear gloves its pretty gross.

 

[Racket]

Yup lube the shaft. Don’t forget to properly clean it. And be very liberal with the new blue goo. Buy the real ford stuff its more expensive but its worth it. Wear gloves its pretty gross.

I love innuendo in the morning. It's the mechanic's all purpise tool.

 

[xplorre]

Just a heads up, you can do this without releasing either of the u-joints. Take note of the position of the yoke support in relation to the two bolts that all did to the frame. Remove those two bolts, release the clamps on the boot, take the drive shaft down and work it around, and it will release. Could be because I have the tremmor shaft and a lift that it works like this, YMMV. Lube it and put it back into position and torque those bolts in the same position. I just threw threw pipe clamps on each end of the original boot, no vibes

 

[Rockhound]

I was lubing my shaft a couple days ago.

(Is this thing on?)

So after feeling an occasional, and slight, clunk or thump at stop signs, I thought maybe I’ve got the slip joint issue.
After watching the video above, I decided to address it. I considered dropping the center bearing, but decided Id rather have the driveshaft on the bench. Got the boot kit, Ford lube and some crimp pliers.
Put the truck on jacks and pulled the shaft.
It looked like it had plenty of lube from the factory, but when I set it on the workbench I realized, what I thought was lube was actually a coating.
I went ahead with the whole process and lightly coated the splines and didn’t pack the output shaft, but just a light coating there also.
After road test, smooth as silk!

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