Rears ID

[Straydog954]

Hi does anybody know how to identify a 44k rear differential when you do not have the truck serial number? Is there anything on the housings or otherwise. I have a Remack tag but the dealer knows nothing from the numbers on it. 

[Mark T]

The 11KH number should be the one you want to give the dealer. Unless that doesn't matter anymore.

[mowerman]

ya mark wouldnt be surprised if we have to scan the bar code these days,,,,lol,,,sorry straydog cant help,,,i usually have to ask here myself also good luck  .bob

[Geoff Weeks]

Are you just talking about the "center section" (Gears) and not the whole axle?

I don't know how Mack does it, but Eaton and Meritor, you 1st ID the housing by casting number/ visual to get the basic model. To then know what rating housing it was built for you look at the diameter and spline of the side gears, and may be the diameter and spline of the input. Only difference between a 34K and a 45K diff is the side gear/axle shaft diameter. The next size up starts a 46K and goes up. 34-45 use a smaller ring gear and fit a smaller housing.

Axle housings are ID'd by the bearings, brake and tube thickness.

So, if trying to ID just the gear-set look to the axle shaft diameter and spline in the side gear of the differential. 

I guess what I'm trying to say, is the housing determines the capacity not the gearset.

Edited 14 hours ago by Geoff Weeks