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workhorse is a division of gm, also most international truck dealers are a workhorse dealer also, a 8.1l is a chevy 496 big block engine and if your rig is chevy powered it is most likely a corporate rear end you can tell by looking at the front of the rearend where the drive shaft hooks to the yoke if there are bolts around the diff its a corporate and just fill it to the bottom of the fill plug.
You need to have the correct tools to rebuild a rearend to get the pinion depth, and back lash set or it wont last long.
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