Rear axle

Gregory Owner/Technician Dominican Republic Posted   Latest  
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2004 Chevrolet Suburban 1500 LS 5.3L (Z L59) 4-spd (4L60-E)
Rear Axle

Need to replace the whole rear axle on this 2WD 

how do I do ident this axle from the RPO 

not to sure I’m a import tech. 

thank you in advance for any help with this 

Greg 

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Ben Mechanic
South Carolina
Ben
   

GT4 indicates it's a 3.73 ratio. No positraction code so it should be an open rear.

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Matt Technician
Texas
Matt
 

GT4 : AXLE,REAR,3.73 RATIO I come up with the same.

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Gregory Owner/Technician
Dominican Republic
Gregory
 

Is there a part number for this to order the correct part as a whole axle?

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Alan Owner/Technician
Mississippi
Alan
 

If I may ask why are you replacing the whole axle housing also are you looking for an axle housing new used what the differential or no differential also RPO code will not identify floating or non floating rear axle Does a vehicle have quad steer. With or without active brake control that makes a difference also. Little more info maybe we can help we have already determined that it is a 3:73…

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Marlin Technician
Oregon
Marlin
 

He is trying to identify the axle, not the ratio.

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Stuart Mobile Technician
Illinois
Stuart
 

There usually a metal tag at one of the cover bolts that identifies the axle assembly.

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Gregory Owner/Technician
Dominican Republic
Gregory
 

That's what I thought but looks like it was removed.

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Stuart Mobile Technician
Illinois
Stuart
 

Look on the side of the differential part of the axle assembly for a rectangular spot,you might need to clean the rust off,but there are numbers engraved or stamped in the housing

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Martin Instructor
British Columbia
Martin
 

Hi Gregory. RPO code GT4 only identifies the gear ratio and since there is no G80, it is an open diff, but the RPO does not identify the axle assembly. Service is by individual components, not assembly. You can identify the axle type and size by the unique shape of the axle housing cover. I'd recommend posting photos of the assembly from various angles to be sure. Post a photograph of the…

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Gregory Owner/Technician
Dominican Republic
Gregory
 

Will get under the truck tomorrow and post a few pics thank you very much.

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Marlin Technician
Oregon
Marlin
 

I am not understanding what you wrote about the gear cuts, and the affect on heat and cooling. Please explain. For one thing, the metal doesn't produce heat, friction does.

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Martin Instructor
British Columbia
Martin
 

Hi Marlin. Metal retains heat from friction and the gear set on the 2 cut gear sets has more metal to shed the heat from axle operation, which is reported to be quieter than 5 cut gear sets. Try running a RWD truck on the lift for NVH and feel the heat that is generated. I use a fan to provide air flow over the axle to reduce heat, regardless of the lubricant type. Using synthetic lubes in…

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Marlin Technician
Oregon
Marlin
 

Some … info there, Martin. Thank you. Regarding the tooth designs and heat, what you are saying doesn't add up. The amount of metal in the teeth has no effect on the amount of heat produced, it only affects absorption and transfer of heat. The ONLY thing that causes heat is friction, which is mostly fluid friction. The gear design affects shear and turbulence; if there really is more heat…

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Glenn Owner/Technician
Texas
Glenn
 

Hi Marlin, I think when all said and done the 5 cut gear design has less actual surface full contact area of the ring gear, and more on the pinion gear. This reduces friction and overall latent weight. Of course the quality and weight of the gear oils make a big difference. Older conventional gear oils used a lot of sulfur to assist with the lubrication, but sulfur is hardly used anymore in…

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Glenn Owner/Technician
Texas
Glenn
 

The door sticker on this model should have a code for the rear axle used. These used the same differentials as many trucks did. Most salvage yards will have them on hand already.

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