Driveshaft Phasing

[Robwill]

Thanks Jason!

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[Big Blue]

Tremor only

Has anyone heard or figured out WHY they made the change to the Temor?

 

[P. A. Schilke]

Has anyone heard or figured out WHY they made the change to the Temor?

Hi Lee,

I think they could price Tremor to cover the cost of CVs over U joints.... I may be wrong but I have seen this before in my time at Ford.... Improvements added to only top of the line models...

Top of the line model buyers essentially off set the added cost and then it trickles down to the lower class vehicles... JMO!

 

[Big Blue]

Hi Lee,

I think they could price Tremor to cover the cost of CVs over U joints.... I may be wrong but I have seen this before in my time at Ford.... Improvements added to only top of the line models...

Top of the line model buyers essentially off set the added cost and then it trickles down to the lower class vehicles... JMO!

Hi Phil,

That explains why the Temor. It still doesn't explain why the change.

As a mech. engineer I understand how cardin joints work. The use of them in a three joint system with varying angles is problematic at best. The angle at the transmission is minimal, need some as you don’t real want to run them perfectly straight. The angle at the differential is easy to adjust to be minimal with differential angle to make itatch the transmission. Varies slightly with suspension travel but again minimal. If you are going to put a CV joint in wouldn’t it make sense to put it in the middle the one with the biggest angle? The one causing the biggest pulses?

As far as the phasing goes. I understand it is common practice with two piece drive shafts. Why I have no idea other than to move pulses out of phase to minimize their effect.

I only know that my '19 XLT FX4 does not have any startup shudder. For which I am very thankful.

 

[Jason B]

Since Tremors have the CV, does that mean no Tremors have the, uh... tremors in the drive train? Does the CV eliminate start up shudder and vibrations at speed?

 

[Porpoise Hork]

Since Tremors have the CV, does that mean no Tremors have the, uh... tremors in the drive train? Does the CV eliminate start up shudder and vibrations at speed?

In theory this should be correct but only way to confirm is to take a Tremor model to a independent certified driveshaft company and have them perform thorough analysis both on/off the truck. Any balance or phase issues would be seen at that point.

One could also mount a camera underneath and perform some basic launch tests as well as at speed tests and record them. A review of the video footage to see if the drive shaft in the Tremor's bounce around like they do in the non-Tremor version Rangers.

 

[quangdog]

Any chance the Tremor shaft assembly can be installed on my FX4?

Also: will the Tremor shaft assembly reduce/remove the start up shudder when pulling away from a stop?

 

[Big Blue]

Since Tremors have the CV, does that mean no Tremors have the, uh... tremors in the drive train? Does the CV eliminate start up shudder and vibrations at speed?

I don't remember hearing of many if any Tremors with the startup shudder. But then again there are so many post and threads on this issue to tell. And many of these post may be vibration from other issues not related to startup shudder, a lot of confusion of terms. The exact cause has yet to be discovered. Nobody can explain why so many don't have it. And yet some have it so bad.

Until some how we can get Ford to do a comprehensive vibration analysis across multiple vehicles with the shudder using common testing equipment and methods to track down a cause, any solution is a wet fingered guess. What may work for one may not work for others
Good luck getting that analysis to happen.

 

[quangdog]

I don't remember hearing of many if any Tremors with the startup shudder. But then again there are so many post and threads on this issue to tell. And many of these post may be vibration from other issues not related to startup shudder, a lot of confusion of terms. The exact cause has yet to be discovered. Nobody can explain why so many don't have it. And yet some have it so bad.

Until some how we can get Ford to do a comprehensive vibration analysis across multiple vehicles with the shudder using common testing equipment and methods to track down a cause, any solution is a wet fingered guess. What may work for one may not work for others
Good luck getting that analysis to happen.

I actually had my truck into the dealer service department for this shudder and a few other things last week. They say that the tech tested the truck and could not feel the shudder... but my truck has dashcams that auto-record any time the truck's ignition is on... and I reviewed the footage after picking up the truck. The tech never road tested it for this issue.... so, yeah.

On a side note, they also claimed that the tech checked the transmission fluid level... but again, the footage indicates that was never actually done. The truck was never put on a lift, and was never driven / left running long enough to bring the trans up to temp to check the level. My service advisor told me that the trans has a sight glass that the tech checked.

 

[Big Blue]

I actually had my truck into the dealer service department for this shudder and a few other things last week. They say that the tech tested the truck and could not feel the shudder... but my truck has dashcams that auto-record any time the truck's ignition is on... and I reviewed the footage after picking up the truck. The tech never road tested it for this issue.... so, yeah.

On a side note, they also claimed that the tech checked the transmission fluid level... but again, the footage indicates that was never actually done. The truck was never put on a lift, and was never driven / left running long enough to bring the trans up to temp to check the level. My service advisor told me that the trans has a sight glass that the tech checked.

That's why it is going to take a Ford tech with Ford equipment running a standard test procedure on multiple vehicles with this issue. Dealer techs are not trained to do this type of analysis. Some are not even trained on the vehicles they have to service. Not likely to happen.

 

[JasonTremor]

I've never felt any start of motion shudders or any harmonics at speed in the Tremor. If the pavement is smooth, the ride is equally smooth so far.

 

[JasonTremor]

I will say I was apprehensive about the general atx tires riding smooth since I had bad luck with general tires in the past. So far, they are riding smooth, but they got a lot of balance weight on each wheel.

 

[Robwill]

Money better spent just going with a one piece replacement. IMHO

Okay. I've come around to the idea of a one piece drive shaft. I'm a sales guy and drive my truck on the highway 99% of the time between 80 and 85 mph. My concern with a one piece is critical speed. Did the one piece shaft make the your truck smoother on the highway and have you had any issues running at 80-85 mph or more? That's where my truck spends a large part of it's life.

 

[navsnipe]

Okay. I've come around to the idea of a one piece drive shaft. I'm a sales guy and drive my truck on the highway 99% of the time between 80 and 85 mph. My concern with a one piece is critical speed. Did the one piece shaft make the your truck smoother on the highway and have you had any issues running at 80-85 mph or more? That's where my truck spends a large part of it's life.

If you have any questions about a one piece driveshaft, email or call Shawn Woods at Tom Woods Driveshaft. He will take time to explain how they engineer a shaft.

 

[Robwill]

If you have any questions about a one piece driveshaft, email or call Shawn Woods at Tom Woods Driveshaft. He will take time to explain how they engineer a shaft.

Already have. He couldn't be sure about the critical speed concern. I'm just wondering if your truck is smoother at hoghwsy speed with thevone piece.

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