The location of the case casting # depends on the manufacturer. Use the pictures below to identify where the case casting # would be on the transmission.

EATON/FULLER (FS6000 MODEL)

GM/MUNCIE

MACK (T SERIES MODEL)

MERITOR/ROCKWELL MODEL

SPICER/TTC (ES MODEL)

SPICER/TTC (PS MODEL)

ZF FORD & GM APPLICATION MODEL