Holy Cow!
 

On Thu, 16 Jul 2009 07:48:43 -0400, NotNow wrote:

Just John Again wrote:
On Wed, 15 Jul 2009 10:08:28 -0400, NotNow wrote:

Just John Again wrote:
On Wed, 15 Jul 2009 08:20:35 -0400, NotNow wrote:

Opened up my newsreader this morning, and 90% political crap and Harry
wasn't even the worst instigator..........
Seems to be a quite peaceful day. H the K is going unanswered, for the
most part, and the political crap is way down.

Plus, I got a new drive shaft in my 4Runner this morning. And, all my
change was left in my glove box.

Lastly, I get to go get my boat out of the shop right now!

Bye.
--

John H
What happened to the drive shaft?

It would bind, and then it would 'unbind' when I stopped. This was
intermittent, maybe once every 5-8 stops. When it 'unbound', it would
slide forword on its splines and stop. This felt like I was getting
rear-ended. It's not an uncommon problem.

Some other folks whining: http://tinyurl.com/ljm6od

I guess I've got a decent dealer. The shop foreman explained the
problem to me and ordered a new shaft.
--

John H

The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?

The driveshaft slides on splines. It's supposed to slide back and
forth to allow for movement of the final drive. It's when it doesn't
just slide that the problem develops.
--

John H

Holy Cow!
 

The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?

The drive shaft has a slip yoke that is supposed to slide smoothly fore and
aft. If it binds, you can get a latent clunk when it eventually frees up,
usually after a hard stop. I had the issue with my F250 and it was solved
with lubrication. I also had the issue with my Lexus GX 470, and it was
solved by replacing the driveshaft with a newer designed unit. Like John
said, it's a very common problem on the 4Runners and GX 470 (same
drivetrain). Lexus has a TSB on it and when I took mine in for its 5000
mile service, the dealer performed the TSB at my request, with no charge and
no hassle. By 5000 miles, mine was just starting to show signs of the
clunk. No problem since the driveshaft was replaced.

Holy Cow!
 

RG wrote:
The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?

The drive shaft has a slip yoke that is supposed to slide smoothly fore and
aft. If it binds, you can get a latent clunk when it eventually frees up,
usually after a hard stop. I had the issue with my F250 and it was solved
with lubrication. I also had the issue with my Lexus GX 470, and it was
solved by replacing the driveshaft with a newer designed unit. Like John
said, it's a very common problem on the 4Runners and GX 470 (same
drivetrain). Lexus has a TSB on it and when I took mine in for its 5000
mile service, the dealer performed the TSB at my request, with no charge and
no hassle. By 5000 miles, mine was just starting to show signs of the
clunk. No problem since the driveshaft was replaced.


So it's binding on the transmission output shaft splines? Interesting.
I've never had one do that, but then again, I've never owned a Toyota.

Holy Cow!
 

"NotNow" wrote in message
...
RG wrote:
The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?

The drive shaft has a slip yoke that is supposed to slide smoothly fore
and aft. If it binds, you can get a latent clunk when it eventually
frees up, usually after a hard stop. I had the issue with my F250 and it
was solved with lubrication. I also had the issue with my Lexus GX 470,
and it was solved by replacing the driveshaft with a newer designed unit.
Like John said, it's a very common problem on the 4Runners and GX 470
(same drivetrain). Lexus has a TSB on it and when I took mine in for its
5000 mile service, the dealer performed the TSB at my request, with no
charge and no hassle. By 5000 miles, mine was just starting to show
signs of the clunk. No problem since the driveshaft was replaced.
So it's binding on the transmission output shaft splines? Interesting.
I've never had one do that, but then again, I've never owned a Toyota.

The slip yoke is a device unto itself with it's own set of splines, so it is
not binding at the output shaft of the trans. And it's not unique to
Toyota. Like I said, I had the same issue on a Ford F250. It's actually a
very common device in driveshaft designs. You can find them on all sorts of
vehicles, from Jeeps to Mustangs and Corvettes. The slip yoke allows the
rear suspension to flex freely without being bound by the drivetrain.

Holy Cow!
 

RG wrote:
"NotNow" wrote in message
...
RG wrote:
The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?
The drive shaft has a slip yoke that is supposed to slide smoothly fore
and aft. If it binds, you can get a latent clunk when it eventually
frees up, usually after a hard stop. I had the issue with my F250 and it
was solved with lubrication. I also had the issue with my Lexus GX 470,
and it was solved by replacing the driveshaft with a newer designed unit.
Like John said, it's a very common problem on the 4Runners and GX 470
(same drivetrain). Lexus has a TSB on it and when I took mine in for its
5000 mile service, the dealer performed the TSB at my request, with no
charge and no hassle. By 5000 miles, mine was just starting to show
signs of the clunk. No problem since the driveshaft was replaced.
So it's binding on the transmission output shaft splines? Interesting.
I've never had one do that, but then again, I've never owned a Toyota.

The slip yoke is a device unto itself with it's own set of splines, so it is
not binding at the output shaft of the trans. And it's not unique to
Toyota. Like I said, I had the same issue on a Ford F250. It's actually a
very common device in driveshaft designs. You can find them on all sorts of
vehicles, from Jeeps to Mustangs and Corvettes. The slip yoke allows the
rear suspension to flex freely without being bound by the drivetrain.


Commonly in small rear wheel drive vehicles, it's a one piece
driveshaft. Starting at the rear end, you have a universal, the
driveshaft, another universal, the yoke, which indeed does couple to the
transmission output shaft via splines. This is where the shaft is
allowed to move because of flex in the rear suspension.

Holy Cow!
 

On Fri, 17 Jul 2009 07:09:59 -0700, "RG" wrote:


The link didn't seem to work for me. But, I'm wondering why it would be
the driveshaft itself instead of the universals?

The drive shaft has a slip yoke that is supposed to slide smoothly fore and
aft. If it binds, you can get a latent clunk when it eventually frees up,
usually after a hard stop. I had the issue with my F250 and it was solved
with lubrication. I also had the issue with my Lexus GX 470, and it was
solved by replacing the driveshaft with a newer designed unit. Like John
said, it's a very common problem on the 4Runners and GX 470 (same
drivetrain). Lexus has a TSB on it and when I took mine in for its 5000
mile service, the dealer performed the TSB at my request, with no charge and
no hassle. By 5000 miles, mine was just starting to show signs of the
clunk. No problem since the driveshaft was replaced.


Ditto. No problems yet.
--

John H

Holy Cow!
 

Commonly in small rear wheel drive vehicles, it's a one piece driveshaft.
Starting at the rear end, you have a universal, the driveshaft, another
universal, the yoke, which indeed does couple to the transmission output
shaft via splines. This is where the shaft is allowed to move because of
flex in the rear suspension.

Yep, that's the more common version of a slip yoke. Like this:

http://www.motorera.com/dictionary/pics/S/slip_yoke.jpg



However, sometimes there is a slip yoke built into the rear of the propeller
shaft. Here's a Ford version:

http://www.ford-trucks.com/article/i...SlipYoke03.jpg

And another on a Jeep Cherokee:

http://polytropia.com/images/cherokee/AxleMount.JPG

The latter two are similar to what John and I have.

Holy Cow!
 

RG wrote:
Commonly in small rear wheel drive vehicles, it's a one piece driveshaft.
Starting at the rear end, you have a universal, the driveshaft, another
universal, the yoke, which indeed does couple to the transmission output
shaft via splines. This is where the shaft is allowed to move because of
flex in the rear suspension.

Yep, that's the more common version of a slip yoke. Like this:

http://www.motorera.com/dictionary/pics/S/slip_yoke.jpg



However, sometimes there is a slip yoke built into the rear of the propeller
shaft. Here's a Ford version:

http://www.ford-trucks.com/article/i...SlipYoke03.jpg

And another on a Jeep Cherokee:

http://polytropia.com/images/cherokee/AxleMount.JPG

The latter two are similar to what John and I have.


Gotcha! I wasn't following you for some reason. So the yoke at the rear
differential slides, too? I know it didn't on my Jeep Cherokee (1995).
I'm going to look at my new Dodge truck this evening!

Holy Cow!
 

Gotcha! I wasn't following you for some reason. So the yoke at the rear
differential slides, too? I know it didn't on my Jeep Cherokee (1995). I'm
going to look at my new Dodge truck this evening!

Yep, it slides and can bind, and when it binds and then lets loose, you get
the clunk.

Holy Cow!
 

RG wrote:

Gotcha! I wasn't following you for some reason. So the yoke at the rear
differential slides, too? I know it didn't on my Jeep Cherokee (1995). I'm
going to look at my new Dodge truck this evening!

Yep, it slides and can bind, and when it binds and then lets loose, you get
the clunk.




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