Spicer IPL: Tandem Drive Axle Illustrated Parts List - All Non-Current Models - Manual (Page 13)

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Tandem Configurations (common applications)
To suit the variety of applications and chassis types requiring these
axles, these Spicer models are avail able in four configurations:
Forward Axles:
DP Models with inter-axle differential and pressure lube pump.
TP Models with straight drive through shaft and no inter-axle
differential.
Rear Axles:
RP Models with standard entry.
SP Models with high entry.
Any combination of forward and rear axles may be encountered. All
configurations and common appli cations are illustrated here.