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I had read somewhere that in 2004 the allison will get some update.. What are the updates and will I still need at least a transgo shift kit it I plan on uping the power





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Lynn
 

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turbo lcc said:
I had read somewhere that in 2004 the allison will get some update.. What are the updates and will I still need at least a transgo shift kit it I plan on uping the power





Thanks


Lynn

Like the previous Allisons it would matter how much power and how you want to use it ....





Mac
 

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What kind of programing does one have to do for more power? Also what kind of HP are we talking about that would require a update to our Allison?


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Are we talking 04/Allison LLY or all 04 trannys My 04 was bought 12/03 and is the LB7. Could anyone explain LIMP MODE WHAT IT IS , HOW IT OCCURS AND HOW LONG BEFORE TRANNY GOES BACK TO NORMAL? THANX, JEFF</TD></TR>
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<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 name=oth2-1396691><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1396691&pubid=437#oth2-1396691" target="_blank">
<H4>FIGURE Current Valve Body Design(c)</H4></A>

<A href="http://service.gm.com/servlets/RetrieveTif?pic=1367797" target="
 

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Reading that service bulliten makes me ask, Why can you not make the old TCM operate the new 04 valve body? I know ATS has a tranny controller box. Just make the box operate the new valve? Could a hacker make it work?
 

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as i read this my o4 cc with lb7 is the same as the older units and should be fine??


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.
 
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