Rear axle

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

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

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

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…

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

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

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

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

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…

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

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.

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…

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…

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…

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.