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Discussion Starter #1
Well, congratulations, you have finally done it. You went out and purchased the truck of your dreams. After painstakingly choosing your color and options, you found the truck you have been wanting for years. You stare for hours at here smooth lines, and spend most of your weekends walking around it with a cotton cloth wiping off finger prints that you only imagine are there. You pop the hood and suddenly it becomes a main stage of inactivity for you and a few close friends to gather around and sip a few cold ones. You are then envy of your friends and neighbors, you have achieved greatness! But wait….. Now you realize that it requires care and attention, not just a regular bath, but more. A lot of people are not sure what to do and may not know how to do it or when it needs to be done. If you fall into one of those categories, read on. I have wrote this just for you.


Today’s vehicles are more dependable then ever before and are designed to run for many miles with little or no maintenance, or at least that’s what the manufacturer would like you to believe. A good maintenance habit is vital to the life of any machine and these trucks are no exception. The fluids must be maintained to ensure that the metals they protect have the proper protection. The filters must be maintained to ensure that the fluids last. The appearance must be maintained to ensure that you don’t have to transplant your driveline into another truck because your body fell apart. All of this maintenance is very simple to do and can be completed by the average DIYer.



The following maintenance schedule was arranged using information from GM, OEM manufacturers and personal experience. It does not represent the standard and should only be used as reference, you may choose to alter it depending on you use of the vehicle. Depending on the year of your truck and the emission system you have, some of the information given may or may not apply. I will also include a suggested list of things to carry with you in your truck for an emergency situation. You will notice that the schedule only goes up to 100,000 miles. After you reach that, refer back to the first service and start over.





5000 miles
<DIR>



Change oil and filter, lubricate suspension. Will be referred to as LOF for future


Inspect tires for correct air pressure and signs of damage. For aggressive tread patterns, it’s a good idea to rotate them at this time. Highway tires can go 10,000 miles between rotations


Replace external spin on transmission filter in Allison equipped trucks.</DIR>


Drain and refill rear axle lube if equipped with the G-80 Eaton differential. It is only required at this interval to remove break in material.


PMI. (preventative maintenance inspection) This includes but is not limited too a complete general inspection of lights, possible fluid leaks and overall vehicle condition. Also, inspect and top off W/W solvent, brake fluid, power steering fluid, transmission fluid, coolant, transfer case, and front and rear axles. Check and replace air filter as needed. Check serpentine drive belt for fraying or cracking. Check and adjust air pressure in tires and don’t forget about the spare. Check and clean fuel cooler of debris. Inspect condition of wiper blades and replace as needed. Inspect batteries and cables for signs of leakage, tightness. Use a spray on type off sealer to help prevent corrosion buildup and keep it cleaned off using a baking soda and cola mixture or a spray style cleaner. GM feels that leaking batteries are partly caused from the posts overheating from poor contact between the cable and battery, make sure this is clean and the cable is tightened properly.








10,000 miles
<DIR>



LOF


Tire rotation and inspection


PMI


Lubricate door hinges, latches and pivo
 

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Eric,

Great List!!


Your note to lube the drive shaft splines at the transmission caught my attention. Do you have to pull the drive shaft? I don't recall seeing a fitting on my 2500HD with the single piece drive shaft.
(My 98 K3500 dually had spline grease fittings - one for the rear two-piece drive shaft and one for the front drive shaft.)

Also I think the DMAX oil spec is CH-4 or CI-4 (not CG-4)?

Edited by: jbplock
 

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Also I think the DMAX oil spec is CH-4 or CI-4 (not CG-4)?
Edited by jbplock on 02 November 2003 at 3:32am


I agree with jbplock. My diesel supplement states CH-4 or CI-4. It is difficult to find, but is recommended for better trapping. Comments Eric.
By the way. Great list, stuff we all should know and do, but are usually too lazy to make a list. Thanks for taking the time.
 

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How does one go about doing an oil analysis, and what valuable information does it give you?
 

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Discussion Starter #6
amesterline said:
How does one go about doing an oil analysis, and what valuable information does it give you?
You can get a kit from George MOrrison at www.avlube.com


It can tell you content of wear metals and if any fuel or coolant is present. It will tell you much much more then I even know.


Eric
 

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Discussion Starter #7
jbplock said:
Eric,

Great List!!


Your note to lube the drive shaft splines at the transmission caught my attention. Do you have to pull the drive shaft? I don't recall seeing a fitting on my 2500HD with the single piece drive shaft.
(My 98 K3500 dually had spline grease fittings - one for the rear two-piece drive shaft and one for the front drive shaft.)

Also I think the DMAX oil spec is CH-4 or CI-4 (not CG-4)?

Bill, you must remove the driveshaft to lube the splines, its a biggest concern on the one piece shaft on the rear, I dont worry so much about the front shaft or the two piece shafts, lubing it will help it move freely and avoid those double bumps on stop and accel


I checked the supplement manual and your right, they do call for CI-4 oil. The service manual does not. I will edit that.


Eric
 

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dmaxalliTech said:
Bill, you must remove the driveshaft to lube the splines ...
Thanks Eric!
 

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Great list.
I might have missed it but I didn't see any mention of servicing wheel bearings.Is any required?
 

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Eric,


I registered today to ask you about the recomended maint list & saw you'd allready posted it. Thanks alot. I'm a first time diesel owner with a 03 duramax. I do most of my own maint. & was lost in a sea of recomendations.


Thanks again,


Dana
 

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Great info! It came just in time, picked up my truck this past Monday.


One question, how do I find out if I have a G-80 Eaton differential? See sig for my truck model.


Thanks!


Mark
 

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>One question, how do I find out if I have a G-80 Eaton differential?


Forgot to mention, I have the locker diff in back.


Thx-


Mark
 

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In the glove box there should be a service parts ID label. It has all the RPO (regular production options) codes. G80 is the code for the Eaton locker. These are some other axle codes.



<TABLE width="100%" border=1>
<T>
<TR>
<TD vAlign=center align=middle>


GT4</TD>
<TD vAlign=top align=left>


Axle Rear 3.73 Ratio</TD></TR>
<TR>
<TD vAlign=center align=middle>


GT5</TD>
<TD vAlign=top align=left>


Axle Rear 4.10 Ratio (DUP With GT8)</TD></TR>
<TR>
<TD vAlign=center align=middle>


GU4</TD>
<TD>


Axle Rear 3.08 Ratio</TD></TR>
<TR>
<TD vAlign=center align=middle>


GU6</TD>
<TD vAlign=top align=left>


Axle Rear 3.42 Ratio</TD></TR>
<TR>
<TD vAlign=center align=middle>


G80</TD>
<TD vAlign=top align=left>


Axle Positraction Limited Slip</TD></TR>
<TR>
<TD vAlign=center align=middle>


G86</TD>
<TD>


Axle Limited-Slip</TD></TR></T></TABLE>
 

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Great post, one suggestion would be to emphasize paying attention to the air filter....From my experience that is the one thing people new to diesels are negligent about....Remember that a diesel runs about 10 times more air through than a gasser, so the filter gets dirty much faster.





 

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Discussion Starter #18
martyb said:
Great post, one suggestion would be to emphasize paying attention to the air filter....From my experience that is the one thing people new to diesels are negligent about....Remember that a diesel runs about 10 times more air through than a gasser, so the filter gets dirty much faster.








PMI. (preventative maintenance inspection) ............This includes but is not limited too Check and replace air filter as needed.
 

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I saw it in PMI, that is why I mentioned to emphasize it and not add it.
 

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Eric, big thanks from a newbie to diesels.





cmc
 
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