IBM AS/400e User Handbook Manual page 444

IBM 9309 Rack Enclosures
#9171, #9141, or #5043 General Purpose I/O Rack
#5032 is not supported in a #9141 rack.
2440 Rack
A 2440 rack supports the 2440 Tape Subsystem and can accommodate up to three DASD
units (#3907 for 9336s or #3908 for 9337s). If external DASD is installed in the 2440, a
wrap-around connector (part number 93X0167) and an EPO jumper (part number 6462413)
are required if attaching it directly to a 9406 System Unit.
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AS/400e System Handbook