Not another Ranger Slip-Bump thread when stopping....Advice needed

[Superspirit]

1 piece driveshaft, global spring's and mine does it in drive, in nuetral but not in sport. I'm thinking it's in the trans or transfer case. Definitely not in the rear end.

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[Lcr3000]

New Driveshaft being installed on Monday. I'll provide feedback as soon as I verified if it fixed the issue or not. The rattling noise during acceleration is veeerry annoying.

 

[TJC]

New Driveshaft being installed on Monday. I'll provide feedback as soon as I verified if it fixed the issue or not. The rattling noise during acceleration is veeerry annoying.

Ford OEM or Tom Woods Single?

 

[Lcr3000]

Ford OEM. It's been on backorder for just about everybody who's had to have one. I've got plenty of warranty left to see if it holds up over time. I'll keep an eye on everyone's feedback on this. Who knows, I'm willing to try the other if it happens again.

 

[9zero1790]

mine is transmission related. if do the neutral and stop the bumps and thuds are gone, except for the toasted rotors that went bad at 20 something k

 

[JasonTremor]

Just got back from a few hours of city dwelling and the slip/bump or whatever we are calling it got on my nerves. Whether I kicked it in neutral, left it in drive or in sport. Come to stop, bump. Pull out, bump. How annoying. I had never noticed it this much before, but I rarely am in that constant stop and go city traffic either. Guess I'll measure the boot clamp on the driveshaft and go to the local Napa store and get a replacement for a future lube job.

 

[Lcr3000]

Ford OEM. It's been on backorder for just about everybody who's had to have one. I've got plenty of warranty left to see if it holds up over time. I'll keep an eye on everyone's feedback on this. Who knows, I'm willing to try the other if it happens again.

UPDATE: I just got back from the Ford Service Center after having a new driveshaft (OEM) installed. I will reiterate that the issue I was having is tapping/rattling during acceleration, not thumping when braking. First let me state that the issue is resolved. When I went to pick up my truck, I asked to see the original driveshaft and the mechanic, so they obliged. I took a photo of the issue. It clearly shows the boot protector torn off from around the bearing housing. Now I don't know when or how that happened, but the result is over time dust and oil got into the bearing and prematurely wore it down.
I know this is most likely a unique situation, but it might help someone else if they end up with the same symptom. For you guys with the thump when braking, I can't make judgement about the carrier bearing. Mine still looked ok on the old shaft.

 

[EJH]

Just got back from a few hours of city dwelling and the slip/bump or whatever we are calling it got on my nerves. Whether I kicked it in neutral, left it in drive or in sport. Come to stop, bump. Pull out, bump. How annoying. I had never noticed it this much before, but I rarely am in that constant stop and go city traffic either. Guess I'll measure the boot clamp on the driveshaft and go to the local Napa store and get a replacement for a future lube job.

I wonder if your bump is like some of ours and worse when warm? That might explain why you notice it more now than earlier? Mine is not noticable during the cooler half of the year.

You can get Ford's boot replacement kit and it works perfect. No need to get a generic one.
I did the lube job on my 2021. Here is my thread comment, with the parts used (including the boot).

This bump is really the only bad thing with my Ranger. I had a few cosmetic items that I fixed myself.

Things I have done that improved the bump:
* lube the spline. This helped to reduce the intensity and occurrence about 50%. It did not eliminate it for me. I used Ford's white grease in the lube kit. I will use the Mastercraft lube that Quangdog had success with next year if I lube it again.
* I have a dealer appointment in two weeks to look at this. I am not holding my breathe they will do anything positive, but worth a try.
* Upgrading the suspension helped the truck nose dive much less on braking and sway back and forth on stops and starts. Reducing the movement reduced the bump intensity.

My theory is lubing the slip yoke is like a band-aid for something else in the driveline. I also think some of the bump when pulling away is the brake hold feature releasing. That does not explain the bump on stop though.

Many people have this issue and don't care. Phil, our resident ex-Ford engineer has it on his truck and says it is harmless.

At the intensity my bump has been reduced to, I almost don't care anymore. However, if there was a good solution, I'd love to have it gone.

 

[JasonTremor]

I wonder if your bump is like some of ours and worse when warm? That might explain why you notice it more now than earlier? Mine is not noticable during the cooler half of the year.

You can get Ford's boot replacement kit and it works perfect. No need to get a generic one.
I did the lube job on my 2021. Here is my thread comment, with the parts used (including the boot).

This bump is really the only bad thing with my Ranger. I had a few cosmetic items that I fixed myself.

Things I have done that improved the bump:
* lube the spline. This helped to reduce the intensity and occurrence about 50%. It did not eliminate it for me. I used Ford's white grease in the lube kit. I will use the Mastercraft lube that Quangdog had success with next year if I lube it again.
* I have a dealer appointment in two weeks to look at this. I am not holding my breathe they will do anything positive, but worth a try.
* Upgrading the suspension helped the truck nose dive much less on braking and sway back and forth on stops and starts. Reducing the movement reduced the bump intensity.

My theory is lubing the slip yoke is like a band-aid for something else in the driveline. I also think some of the bump when pulling away is the brake hold feature releasing. That does not explain the bump on stop though.

Many people have this issue and don't care. Phil, our resident ex-Ford engineer has it on his truck and says it is harmless.

At the intensity my bump has been reduced to, I almost don't care anymore. However, if there was a good solution, I'd love to have it gone.

I think you are correct on the higher ambient temps coinciding with the bump occurring in a higher frequency. The longer you drive it and with more stop and go cycles, the consistency of the bump happening increases. It's not terrible, but is annoying and seems to be getting more consistent as I put more miles on the truck. It feels identical to what I've experienced in other manufacturers trucks and greasing the splined driveshaft or slip yoke always solved it on those. Most other manufacturers used a moly based grease in their fixes, but I see Ford is going the ptfe route.

 

[Raacerx]

I've noticed this on my truck but forgot about it, because 85% of the time I'm pretty loaded up.

I recently removed all my racks and rooftop tent and DECKD unit in the rear, and experienced the thump again. It never happens when I'm loaded up.

I tried it in neutral, and it persists, so assumed it was something in the rear suspension and not the driveline. I have no suspension mods.

 

[EJH]

I've noticed this on my truck but forgot about it, because 85% of the time I'm pretty loaded up.

I recently removed all my racks and rooftop tent and DECKD unit in the rear, and experienced the thump again. It never happens when I'm loaded up.

I tried it in neutral, and it persists, so assumed it was something in the rear suspension and not the driveline. I have no suspension mods.

I should add my bump is less the more I am loaded up. I am mostly always loaded with at least 200 lbs (rack and tent). Also, the Tremor should have a firmer suspension (similar to my upgraded Fox 2.0s), so the nose dive and rocking back and forth on stop and start should be less than a stock non-Tremor.

 

[Raacerx]

I should add my bump is less the more I am loaded up. I am mostly always loaded with at least 200 lbs (rack and tent). Also, the Tremor should have a firmer suspension (similar to my upgraded Fox 2.0s), so the nose dive and rocking back and forth on stop and start should be less than a stock non-Tremor.

I actually think the Tremor has softer suspension than an FX4. At least more preload, maybe not actual spring rate.

I usually have about 650 pounds in the bed minimum. I find it a bit tough to see how it's the driveshaft and deflection when it occurs in neutral.

 

[EJH]

I actually think the Tremor has softer suspension than an FX4. At least more preload, maybe not actual spring rate.

I usually have about 650 pounds in the bed minimum. I find it a bit tough to see how it's the driveshaft and deflection when it occurs in neutral.

The driveshaft is still tuning in neutral. The slip yoke could still be an issue.

 

[Raacerx]

The driveshaft is still tuning in neutral. The slip yoke could still be an issue.

Of course, but without any load.

 

[omega26]

My bump is extremely consistent, just about always present, but I have not had the truck in colder weather. The only way it goes away is if I slip the truck into neutral before braking. Sport mode, tow mode, having 400ish lbs in the bed, manually shifting gears and keeping in first, etc., the bump is always present.

Not sure that the fact of the bump going away in neutral necessarily isolates it as a transmission issue, just that the driveshaft (with an excessively loose carrier bearing) isn't spinning any more so the bump disappears.

Torque converter unlocking still could be factor still as well I suppose.

I agree that lubing the slip yoke splines just masks the problem. Mine have been lubed and it seems to have had minimal effect for me.

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