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Discussion Starter #1
How do you check the transmission fluid on the 2004 LLY Allison?



When the engine is first started, shift lever in park the fluid level is low at the fluid level when cold mark.



When the transmission is up to operating temperature 150 degrees, shift lever in park, the fluid level is only at the the fluid level full when cold.



I would think it should be at the full when hot level. My fluid has never been to the full when hot level, even after a 300 mile trip.



I took the truck back to the dealer for them to recheck all the fluid levels and they said that everything was ok.
Edited by: Melvin Hatcher
 

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The warmer the tranny as 150 is luke warm
the farther up the stick it will climb ... Your less then a quart away from it going into the low range of HOT at 150 degrees ....


I wouldn't sweat it ....





Mac
 

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<H1>Transmission Fluid Checking Procedure</H1><A name=ss1-663509><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=663509&evc=sm&pubid=297&cellId=7795&mspsdsubkey=2297#ss1-663509" target="_blank">
<H5>Transmission Fluid Level Checking Procedure -- Cold Fluid</A></H5>


The purpose of the cold check is to determine if the transmission has enough fluid to be operated safely until a hot check can be made.




  1. <H4>Important</H4>


    The fluid level rises as fluid temperature increases. DO NOT fill above the "COLD CHECK" band if the transmission fluid is below normal operating temperatures.



    <LI =1>Bring the vehicle to a complete stop on a level surface using the service brakes.
    <LI =1>Ensure that the engine is at low idle RPM (500-800 RPM).
    <LI =1>With the service brakes applied, put the transmission in the P (Park) position.
    <LI =1>Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
    <LI =1>Apply the parking brake and make sure it is properly engaged.
    <LI =1>Run the engine for at least one minute. Apply the service brakes and shift to D (Drive), then to N (Neutral), and then shift to R (Reverse) to fill the hydraulic system.
    <LI =1>Ensure that the engine is at low idle RPM (500-800 RPM).
    <LI =1>With the service brakes applied, put the transmission in the P (Park) position.
    <LI =1>Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
    <LI =1>With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.



    <H4>Important</H4>
    <UL =BULLET>
    <LI>If the fluid level is within the "COLD CHECK" band, the transmission may be operated until the fluid is hot enough to perform a "HOT RUN" check. If the fluid level is not within the "COLD CHECK" band, add or drain as necessary to bring it to the middle of the "COLD CHECK" band.
    <LI>Always check the fluid level at least twice using the procedure described above. Consistant readings are important to maintaining proper fluid level. If inconsistent readings persist, check the transmission vent assembly to be sure that it is clean and unclogged. If readings are still inconsistent, contact your nearest Allison distribution or dealer. </LI>



<LI =1>Insert the fluid level indicator into the fill tube and remove. Check the fluid level reading. Repeat the check procedure to verify the reading.
<LI =1>Perform a hot check at the first opportunity after the normal operating sump temperature of 71°C-93°C (160°F-200°F) is reached. </LI>[/list]<A name=ss2-663509><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=663509&evc=sm&pubid=297&cellId=7795&mspsdsubkey=2297#ss2-663509" target="_blank">
<H5>Transmission Fluid Level Checking Procedure -- Hot Fluid</A></H5>




  1. <H4>Important</H4>


    The fluid must be hot to ensure an accurate check. The fluid level rises as temperature increases.



    <LI =1>Operate the transmission in D (Drive) range until normal operating temperature is reached. Normal operating temperature is any of the following:
    <UL =BULLET>
    <LI>sump temperature 71°C-93°C (160°F-200°F)
    <LI>converter-out temperature 82°C-104°C (180°F-220°F)
    <LI>If a transmission temperature gauge is not present, check fluid level when the engine water temperature gauge has stabilized and the transmission has been operated under load for at least one hour. </LI>
<LI =1>Bring the vehicle to a complete stop on a level surface using the service brake.
<LI =1>Ensure that the engine is at low idle rpm (500-800 rpm).
<LI =1>With the service brakes applied, put the transmission in the P (Park) position.
<LI =1>Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
<LI =1>Apply the parking brake and make sure it is properly engaged.
<LI =1>With the engine runni
 

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Discussion Starter #4
Mackin said:
The warmer the tranny as 150 is luke warm
the farther up the stick it will climb ... Your less then a quart away from it going into the low range of HOT at 150 degrees ....


I wouldn't sweat it ....


Mac

Thanks Mack. I thought 150 was normal operating temperature and that was the temperature that the level would indicate full when hot like most automatic transmissions.



I suppose the Allison has a different fluid checking method or temperature operating range.



At any rate, I am glad that I checked here to ease my mind about my fluid level on my new Allison. However, I added a quart of transmission fluid to get it up to lower edge of the full when hot band just to satisfy me.



I know that My Buick GN 200 r4 the fluid level has to be run a quart over to get a decent 2nd to 3rd shift without slipping.



Everything else, I ran at the full mark when hot at normal operating temperature.
Edited by: Melvin Hatcher
 
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