Spicer Tandem Drive Axle: DS_RS461, 462, 463, 521, 581, DT_RT_DP_RP461, 462, 463, 521, 581, 601, 651 - Manual (Page 45)

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Drive Pinion and Gear Set
Single Reduction - 18" Gearing
Forward Axle Models: DS461-P, DS521-P, DS581-P Rear Axle Models: RS461, RS521, RS581
Ratios Gear Set Gear (NSS) Pinion (NSS) Gear Set Gear (NSS) Pinion (NSS)
41,2.100" Dia. 41,2.100" Dia.
3.55 122667 126678(39) 126679(11) 122668 111349(39) 126677(11)
3.70 122334 98160(37) 126161(10) 121887 88500(37) 126120(10)
3.90 123333 99900(39) 127047(10) 123334 99896(39) 127048(10)
4.11 122335 94381(37) 126162(9) 121888 88502(37) 126121(9)
4.33 122336 78856(39) 126163(9) 121889 52999(39) 126118(9)
4.56 122337 78858(41) 126164(9) 121890 73312(41) 126125(9)
4.88 122338 78860(39) 126165(8) 121891 53001(39) 126119(8)
5.29 211333 127339(37) 127327(7) 211335 127338(37) 127328(7)
5.43 122339 78862(38) 126166(7) 121892 53003(38) 126122(7)
6.17 122340 78864(37) 126167(6) 121893 53005(37) 126123(6)
6.50 212890 128028(39) 128029(6) 212891 128030(39) 128031(6)
6.67 213287 107888(40) 128052(6) 213288 53007(40) 128054(6)
Dual Range and Planetary Double Reduction - 18" Gearing
Forward Axle Models: Rear Axle Models:
DT461-P, DP461-P, DT521-P, DP521-P, DT601-P RT461, RP461, RT521, RP521, RT601, RP601,RT651, RP651
DP601-P, DT651-P, DP651-P, TP/SP601, TP/SP651
Ratios Gear Set Gear (NSS) Pinion (NSS) Gear Set Gear (NSS) Pinion (NSS)
41,2.100" Dia. 41,2.100" Dia.
3.70/5.04 122387 126567(37) 126161(10) 122394 126568(37) 126120(10)
3.90/5.32 124444 127183(39) 127047(10) 124445 127184(39) 127048(10)
4.11/5.60 122388 126569(37) 126162(9) 122395 126570(37) 126121(9)
4.33/5.90 122389 126571(39) 126163(9) 122396 126572(39) 126118(9)
4.56/6.20 122390 126573(41) 126164(9) 122397 126574(41) 126125(9)
4.88/6.64 122391 126575(39) 126165(8) 122398 126576(39) 126119(8)
5.43/7.39 122392 126577(38) 126166(7) 122399 126578(38) 126122(7)
6.17/8.40 122393 126579(37) 126167(6) 122400 126589(37) 126123(6)
Appendix
Gear & Pinion Information