[grasshopper]

Hey guys whats goin on? There was some talk awhile back about a sylonoid on the new lly allison tranny that is causing havoc for anyone who is adding power to this truck! I was just wondering if anyone has come up with some sort of fix for that, wether it be to bypass this problem or actually flash the tcm to help the problem? Just wondering, so if anyone has info I'd love to hear it!!! thanks alot!


DEREK

 

[Mike L.]

Steve Cole at TTS and i are doing some extensive testing right now. We will keep you updated as we find things out.


mike

 

[grasshopper]

Thanks man, I appreciate the answer!!!

 

[Amric]

The ATS Co-Pilot fixes the issue with the extra solinoid

 

[Mike L.]

Amric


Be carefull with your tech advise. Explane how the copilot will change the strategy of the TCM concerning the "G" solenoid and overide it. Will the copilot interfere with the backfill to the other clutch units, and how? What will be the true mainline pressure at idle and other RPM's? I know you are jazzed with your ats which is cool. I don't think you shoud be advising people to do things in a $6k Allison unless you are ready to come to the plate when and if something goes wrong. Sorry if it sounds like i am jumping on you, but i am not.


mike

 

[White Duramax]

Mike, if it is working and holding in his 04 wouldnt it be fixing it then??

 

[Zeeb]

White,


Since there are not any "chips" out for the LLY yet, looking at Amric's sig would suggest he has an LB7 engine. The new Allison hardware is not functional in his transmission if he does indeed have the LB7.

 

[grasshopper]

true that!!!

 

[Powell]

The 04 LB7s have the same tranny as the old LB7s correct??

 

[Zeeb]

The 04 LB7s have the same tranny as the old LB7s correct??

What's that old TV commercial tag line? Not exactly...


There were some mods made to the '04 Allison, and you'll have to wait for Mike L or somebody who's actually worked on them, to tell you exactly what they are if you want to know that. But essentially they have to do with improved flow rates and cooling of the ATF. IIRC, Allison also kicked up the power ratings the trans is supposed to hold for the LLY version.


The mods are on all the '04 Allisons, but are only functional on the 8.1 gasser and LLY Dmax engines.

 

[grasshopper]

LB7 is still the same!!!! LLY on the other hand is not

 

[Zeeb]

LB7 is still the same!!!! LLY on the other hand is not

I beg to differ based on a GM bulletin posted by GMCSID on Jan. 23, 2004, which states that all the transmissions are the same but that the improvements are only functional in the LLY and 8.1:
<H1>Info - Allison Automatic Transmission Valve Body Hardware Changes #03-07-30-053 - (10/24/2003)</H1>


Allison® Automatic Transmission Valve Body Hardware Changes


2001-2004 Chevrolet Silverado


2001-2004 GMC Sierra


with Allison® Automatic Transmission (RPO M74)


The valve body for the Allison® Series 1000 transmission has been revised for the 2004 model year to add modulated main pressure control. This revision will provide additional transmission oil cooler flow and reduced pump load during certain low speed operating conditions. The revised components will be installed on all 2004 transmissions and will be functional on the L18, 8.1L gas engine and LLY, 6.6L diesel engine but not on the LB7, 6.6L diesel engine.


Visible changes to the valve body assembly include an added modulated main valve body assembly, a control solenoid and a revised internal wiring harness. The modulated main valve body and solenoid are located on the bottom, near the front of the valve body assembly and are connected to the wiring harness by an additional wire and connector.



<H4>Important</H4>


This revised valve body will be used to service all 2001-2004 models. The modulated main pressure components will not function on the 2001-2003 models as the TCM is not equipped with the calibrations necessary to make these components operate. Installation of a modulated main equipped service valve body on a 2001-2003 transmission will not affect transmission operation.





Interchangeability


The current valve body assembly, P/N 29541572, is fully interchangeable with any 1000/2000/2400 SeriesTM production main case. The shift body, the main body and the separator plate are not interchangeable between the two generations of hardware. The current design incorporates a relocation of the dowel pin in order to prevent mixing of current and former designs.


Parts Modifications


Passageways and orifices have been added/modified to allow for the implementation of the Modulated Main Pressure feature. Mixing of former P/N valve body components will not be possible. Relocation of dowel pins and modification of separator plates is not allowed to facilitate the assembly of former and current components.


New Service Procedure


Removal and installation procedures for the complete assembly have not changed with this modification. However, it is important to know that the correct Wire Harness, P/N 29539792, must be used. This harness includes an additional connector for the current G solenoid. When securing the G solenoid to the Modulated Main Valve Body, be certain to insert the retaining clip from the "Main Body" side. The clip needs to become trapped between the two components. There are now six gold colored bolts (longer 65 mm (2.56 in) that secure the modulated main body to the valve body assembly and also to the main case.<A name=oth1-1396691><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1396691&pubid=437#oth1-1396691" target="_blank">
<H4>FIGURE Former Valve Body Design(c)</H4>


</A>

<A href="http://service.gm.com/servlets/RetrieveTif?pic=1367796" target="_blank"><IMG id='chkImg1' name='chkImg2' id=chkImg1 alt

 

[grasshopper]

Dude, I've modded some of the last lb7's and have had not one issue!!!! so maybe its just me, I don't know!!! either that or i'm blind or something!!, maybe in the states you had a few there with this. Not here in CANADA. Who knows though!!!


DEREK

 

[grasshopper]

The revised components will be installed on all 2004 transmissions and will be functional on the L18, 8.1L gas engine and LLY, 6.6L diesel engine but not on the LB7, 6.6L diesel engine.








This is what I am saying here!!!!!!!!!!!!!!

 

[Amric]

Amric


Be carefull with your tech advise. Explane how the copilot will change the strategy of the TCM concerning the "G" solenoid and overide it. Will the copilot interfere with the backfill to the other clutch units, and how? What will be the true mainline pressure at idle and other RPM's?


mike

I asked Clint this very question before I bought the Co-Pilot. His answer was that they replace the factory harness, and intercept the signal to the new solinoid that commands it to lower the pressure. The signal never reaches the solinoid. I am only passing on the information that was passed to me. I do have the new solinoid, and the harness that was sent with my co-pilot was 2004 specific.


As I had nothing to do with the design of the Co-pilot, I would defer the line pressure and backfill questions to them.

 

[Amric]

I do have the LB7 and not the LLY, so I guess my Allison is not proof that the Co-pilot would fix an LLY, but this was how I understood it. I would suggest anyone with an LLY confirm with ATS before buying the Co-pilot.


I also talked to Suncoast, and they also said they had a mechanical solution to the problem.

 

[Zeeb]

grasshopper,


The question was:

The 04 LB7s have the same tranny as the old LB7s correct??

I answered the man's question with:



<TABLE cellSpacing=0 cellPadding=0 width="95%" align=center><T><T><T>
<T>
<TR>
<TD class=bold>Zeeb wrote:

<TABLE cellSpacing=0 cellPadding=1 width="100%" bgColor=#999999><T><T><T>
<T>
<TR>
<TD>
<TABLE cellSpacing=0 cellPadding=2 width="100%" bgColor=#ffffff><T><T><T>
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<TD class=text>



<TABLE cellSpacing=0 cellPadding=0 width="95%" align=center><T><T><T>
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<TD class=bold>Powell wrote:

<TABLE cellSpacing=0 cellPadding=1 width="100%" bgColor=#999999><T><T><T>
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<TABLE cellSpacing=0 cellPadding=2 width="100%" bgColor=#ffffff><T><T><T>
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<TD class=text>The 04 LB7s have the same tranny as the old LB7s correct??</TD></TR></T></T></T></T></TABLE></TD></TR></T></T></T></T></TABLE></TD></TR></T></T></T></T></TABLE>


What's that old TV commercial tag line? Not exactly...


There were some mods made to the '04 Allison, and you'll have to wait for Mike L or somebody who's actually worked on them, to tell you exactly what they are if you want to know that. But essentially they have to do with improved flow rates and cooling of the ATF. IIRC, Allison also kicked up the power ratings the trans is supposed to hold for the LLY version.


The mods are on all the '04 Allisons, but are only functional on the 8.1 gasser and LLY Dmax engines.</TD></TR></T></T></T></T></TABLE></TD></TR></T></T></T></T></TABLE></TD></TR></T></T></T></T></TABLE>


As said above, "Not exactly..." Which is a true statement either here in "the states" or in "CANADA".


No one is trying to impugn your intelligence or experience, so I think you can leave the exclamation key out of it.


Since I have one of the transmissions with the different TCM programming to make the changes work, I'm very interested in what Mike L. comes up with since I'd like a Juice/Attitude when they come out, but not if the trans is going to have a problem holding on to it.


The mods mentioned from Suncoast and ATS are just way to expensive for me right now besides voiding the warranty on the trans, so I try to keep up with everything that's posted regarding these changes in the programming and hardware of the trans behind my LLY...

Being taken as confrontational was not my intent. Sorry if you felt that way.Edited by: Zeeb

 

[Mike L.]

So far i can tell you guys that i am not convinced that the new solenoid is a problem. I was told that it was before i ever saw it. I warned you guys because of what i was told(trusted references). Now, we have gages hooked up to the TTS truck reading pressures daley.(LLY) I need to call Eric and see if i can't borrow his fitting to test my pressures.(LB7). I can tell you this much; Steve Coles truck(TTS) responds much better to horsepower mods than my truck does as far as the Ally. goes. His truck outruns my truck and we are both running a tow program. I like what i see in his trans pressure rise, although i have not pressure tested mine yet i can feel the difference. So, do we have a problem in the Ally. with the LLY activated "G" solenoid? I don't see it that way and will probably have Steve activate it when test are done. We are also working on using the "G" solenoid to our advantage. I think we have something good here.


mike

 

[grasshopper]

Zeeb, no hard feelings, i think we, mostly I got lost in translation. Both of us were trying to drive the same point home I believe! Any ways good luck with moddin the new one, my mama has a LLY on the way, I can't wait to see the look on her face when her new toy will contaminate the pavement with a slight touch of the loud pedal!!!!!

DEREK