Vehicles application: Chevrolet P-30 & GMC P-3500
The axle has a banjo-type housing with a removeable carrier. The drive pinion is straddle mounted on removeable carrier. There is no adjustment for drive pinion depth or bearing preload. The preload on the differential side bearings is set by adjusting nuts on which the bearing cups rest. The differential has a two-piece case and four differential pinion gears.
AXLE RATIO & IDENTIFICATION
The 12 1/4″ ring gear axle assembly is the only one on General Motors vehicles that has a removeable carrier. The axle ratio can be determined by dividing number of ring gear teeth by number of drive pinion teeth.
REMOVAL & INSTALLATION
AXLE SHAFTS
Remove axle shaft hub cap and install slide hammer into hole on axle shaft flange. Pull shaft straight out of housing. To install, reverse removal procedure, using a new gasket on hub cap, and making sure axle flange splines index into wheel hub splines.
WHEEL HUB & SEAL
Remove axle shaft, then remove lock nut retainer, lock nut, adjusting nut and thrust washer from axle housing. Pull hub and drum assembly straight off axle housing, using care not to drop bearing inner race and roller assembly. Pry old seal from wheel hub, using care not to damage bore surface. Thoroughly clean seal contact area, then pack cavity between seal lips with high melting point wheel bearing lubricant. Position seal in hub bore, then carefully press seal into hub using suitable tool (J-22354) until seal is flush with edge of hub. Install hub onto axle housing and install axle shaft.

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