Alli 6 sp slipping between 3rd and 4th upshift

bratman

bratman

A saved sinner
Dec 23, 2009
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Bakersfield, Ca
Greeting people,

I am running an edge on Hot 2 with a trans jr and an Allison deep pan with no filter lock.. I have never thrown a code yet. Recently with the cold weather here in Bakersfield I noticed as my truck shifts from 3rd into 4th there seems like a slip 2-300 rpms then it goes into 4th. Trans temp is usually under 100 degrees when it happens. When I run it out the back door, no slip. Also When I punch it from a dead stop, the truck shudders and hops but takes off like grease lightning. I also installed 4.56's 2 weeks ago to offset my 33" tires. and my mileage has dropped to 12-13 city/ 18-19 hi.
Finally: YES I have a heavy foot. YES I like PRO-launches.

So bottom line question is: In anyone's opinion how close am I to grenading this tranny? is it the beginning of the end?

Thank You & GOD Bless.
 
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darkness

darkness

Well-known member
Jul 15, 2009
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yeah 4.56's are a little short for 33's. they are more suited for 37's. i have 35's and 4.10's and the speedo is within 1-2 (slower than gps) mph on the highway.
 
IOWA LLY

IOWA LLY

Yes, its really me
Feb 23, 2007
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The shudder sounds like you might have a bad carrier bearing. Check and see if the rubber around the bearing is deteriorated.
 
bratman

bratman

A saved sinner
Dec 23, 2009
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Bakersfield, Ca
The shudder is only on launch. Like going over very rough blacktop. Is the carrier bearing on the outside by the yoke?
And the other is that my tires are not tall enough?
I had to go into my edge and change my tire size to like 160/60/15 to get the speedo to slow down to a close speed.
 
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IOWA LLY

IOWA LLY

Yes, its really me
Feb 23, 2007
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bratman said:
The shudder is only on launch. Like going over very rough blacktop. Is the carrier bearing on the outside by the yoke?
And the other is that my tires are not tall enough?
I had to go into my edge and change my tire size to like 160/60/15 to get the speedo to slow down to a close speed.
Click to expand...



You have a crew cab long box by the looks of it, so you have a two piece driveshaft with a carrier bearing in the middle.
 
bratman

bratman

A saved sinner
Dec 23, 2009
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Bakersfield, Ca
Yes I do have a CCLB. ok, and so the rubber will be deteriating? any other indications? too loose , too tight?
I deeply appreciate all your input.
:thumb: Thank You
 
Mike L.

Mike L.

Got Sheep?
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Aug 12, 2006
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bratman said:
ok ok so the shudder can be the carrier bearing failing? That's on the drive shaft?:confused:
Click to expand...

The carrier bearing rarely fails, but the incoreect angle of the driveshaft does a number on the rubber supporting the bearing. it's the rubber that gives out.
 
custom8726

custom8726

Active member
Feb 25, 2008
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Never changed a carrier bearing on a D-max but assuming there similar to others? The bearing is pressed on and a bit of a PITA to change with out the right tools. JFYI...
 
THEFERMANATOR

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
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Mike L. said:
The carrier bearing rarely fails, but the incoreect angle of the driveshaft does a number on the rubber supporting the bearing. it's the rubber that gives out.
Click to expand...

the one in my donor truck didn't even have rubber left inside of it when I pulled the shaft out, and this was an 01 3500 dually with no lift and 162K miles that was 100% stock. But the bearing inside wasn't bad by feel. Also due to the rubber being gone it had let the driveshaft move forward and had knocked the welch plug loose in the slip yoke and was leaking pretty bad there.
 
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