One Piece Driveshaft

[Stevedbvik1]

That was my thoughts as well but figured it wouldn't hurt to add to the conversation.

Mounting tabs for carrier bearing on cross member welded at wrong angle? I’ve been laying under my truck for 15 minutes looking at your pics and my truck and trying to spot anything.

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[NotBudule]

Holy crap that is way better centered than my Tremor. Why so much difference between two exact same trucks? Something isn’t right

Thats how mine looks...

 

[Dr3wDrop]

Mounting tabs for carrier bearing on cross member welded at wrong angle? I’ve been laying under my truck for 15 minutes looking at your pics and my truck and trying to spot anything.

You have an iphone? You can see what degree you DS is on either end if the carrier bearing and I can check mine

 

[Dr3wDrop]

Mounting tabs for carrier bearing on cross member welded at wrong angle? I’ve been laying under my truck for 15 minutes looking at your pics and my truck and trying to spot anything.

Surprisingly both ends of mine were 10 degrees. I assumed they would be at two different angles given the pivot point in the center.

 

[Shawn at Tom Wood's]

I think the mystery of the off-centered stock bushings is a simple one to solve. The rubber is soft, barely firm enough to hold the shaft in place in the first place. So if it is just a teeny bit softer or more broken-in in one section, the shaft is going to naturally come to rest off-center, favoring the soft spot. That and as the shaft is under torque it is trying to straighten itself out or even move to the side. That's really I think the underlying principal behind the shudder in the first place, some of the torsional force on the shaft gets directed sideways as radial force due to the geometry of the shaft. Shaft pushes sideways against the bearing as it rotates, twice or so per revolution, in an elliptical manner, and viola you have a shudder. Anyways, when your truck is in park there is still torque on the shaft, torque which is keeping the truck from rolling away. That is enough to put some radial force on that bearing and push the shaft a little off center. An interesting experiment would be to chock your wheels, put the truck in neutral to unload the torsional load on the shaft, and then look to see if it sits more centered or not.

 

[NotBudule]

And they would have gotta away with it if not for those damn kids!

I told the wife im getting a damn driveshaft and she just needs to get used to it ... but dont make mine right now , cause shes not used to it yet , i gots to pout and be pathetic for a while , dont underestimate either of those , both have gotten me laid most of my life...

 

[Stevedbvik1]

I think the mystery of the off-centered stock bushings is a simple one to solve. The rubber is soft, barely firm enough to hold the shaft in place in the first place. So if it is just a teeny bit softer or more broken-in in one section, the shaft is going to naturally come to rest off-center, favoring the soft spot. That and as the shaft is under torque it is trying to straighten itself out or even move to the side. That's really I think the underlying principal behind the shudder in the first place, some of the torsional force on the shaft gets directed sideways as radial force due to the geometry of the shaft. Shaft pushes sideways against the bearing as it rotates, twice or so per revolution, in an elliptical manner, and viola you have a shudder. Anyways, when your truck is in park there is still torque on the shaft, torque which is keeping the truck from rolling away. That is enough to put some radial force on that bearing and push the shaft a little off center. An interesting experiment would be to chock your wheels, put the truck in neutral to unload the torsional load on the shaft, and then look to see if it sits more centered or not.

Wheels chocked, truck in neutral and driveshaft relaxed ( plenty of rotational movement).
No change, exactly the same. Can push drive shaft up almost 3/8 of an inch by hand.

 

[Dr3wDrop]

Shot a quick email to Fabtech to ask them about their F250 Heavy Duty Carrier Bearing.
https://fabtechmotorsports.com/product/heavy-duty-carrier-bearing-kit-fts92023/

I got a reply from Fabtech today. They do not have an HD Carrier Bearing replacement for the ranger. Not really surprised.

 

[TJC]

I have one other data point of interest to make concerning the difference between the 2 piece and single piece driveshaft.

I have noticed that my truck is smoother on take off, but it is also crisper on throttle response, and transmission is shifting much better. I attibute this to lack of slop in the drive train. Whatever it is, it has made a difference for the positive.

I had mentioned long ago somewhere on this forum that I did not trust my 2020 Ranger enough to time traffic, as there was a distinct hesitation and stumble out of the gate.

I was out in rush hour traffic this morning and that hesitation/stumble is gone on startup, and the transmission shifts are crisp and smooth - no more jerks when accelerating or coming to a stop. I now like the 10 speed transmission very much.

I've got 14K mile on my Ranger, and 1,500 since the driveshaft change. I am finally beginning to trust the 2020 Ranger as much as I trust my 2005 Ranger. I can drive them with the same technique now.... even when timing traffic.

- T

 

[NotBudule]

I have one other data point of interest to make concerning the difference between the 2 piece and single piece driveshaft.

I have noticed that my truck is smoother on take off, but it is also crisper on throttle response, and transmission is shifting much better. I attibute this to lack of slop in the drive train. Whatever it is, it has made a difference for the positive.

I had mentioned long ago somewhere on this forum that I did not trust my 2020 Ranger enough to time traffic, as there was a distinct hesitation and stumble out of the gate.

I was out in rush hour traffic this morning and that hesitation/stumble is gone on startup, and the transmission shifts are crisp and smooth - no more jerks when accelerating or coming to a stop. I now like the 10 speed transmission very much.

I've got 14K mile on my Ranger, and 1,500 since the driveshaft change. I am finally beginning to trust the 2020 Ranger as much as I trust my 2005 Ranger. I can drive them with the same technique now.... even when timing traffic.

- T

Mine actually shifted better after shimming it , mostly the stoplight clunk is gone , downshifts seem better , still get hard upshifts though , I took it back to stock last nite and drove it around and to work this morning, IF I drive somewhat normal, like I care about gas mileage or am not late , mine is actually pretty good , problem is I hardly ever drive like that , and when I drive like I normally do , I gets the rumbles on take off , and if I hit it hard to pass and a little something (not bad ) at 70+ , shimming seems to help with that , but moves the rumbles elsewhere , I'm going under for one more shot as I cut away some of the shim and see if I can find middle ground , I thought I had it with the soft hose but it fell out...

 

[Dr3wDrop]

Mine actually shifted better after shimming it , mostly the stoplight clunk is gone , downshifts seem better , still get hard upshifts though , I took it back to stock last nite and drove it around and to work this morning, IF I drive somewhat normal, like I care about gas mileage or am not late , mine is actually pretty good , problem is I hardly ever drive like that , and when I drive like I normally do , I gets the rumbles on take off , and if I hit it hard to pass and a little something (not bad ) at 70+ , shimming seems to help with that , but moves the rumbles elsewhere , I'm going under for one more shot as I cut away some of the shim and see if I can find middle ground , I thought I had it with the soft hose but it fell out...

Now I think I am confused. Shifting shouldn't be affected? Or are you saying you feel the driveshaft slop when the transmission changes gears and that whole centrifugal affect starts over?

 

[Dr3wDrop]

@NotBudule So at the 40 second mark in this video that is what I think people are experiencing. But this video is only during a takeoff. Not really showing any hard upshifting or downshifting.

 

[NotBudule]

Now I think I am confused. Shifting shouldn't be affected? Or are you saying you feel the driveshaft slop when the transmission changes gears and that whole centrifugal affect starts over?

It's mostly the stoplight clunk part ,but also I think even when it hard shifts I seem to feel it less , like one clunk instead of 2 , probably in my head though , plenty of room up there for imaginary bullshit to worry about...

 

[Dr3wDrop]

It's mostly the stoplight clunk part ,but also I think even when it hard shifts I seem to feel it less , like one clunk instead of 2 , probably in my head though , plenty of room up there for imaginary bullshit to worry about...

I feel like the stoplight clunk may be related to a lack of grease in the slip joint?

 

[NotBudule]

I feel like the stoplight clunk may be related to a lack of grease in the slip joint?

Maybe, but changing the angle on mine seems to have cured 75 % of it , when I take the shim out and the shaft drops down in the carrier it is far worse than when I have it centered...

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