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Axle Ratio Identification

Conventional Differentials

Code Ratio
RUA, RUB, TAA 2.73:1
RAA, RAC, RAF, RAU, RWB, RWC, RWD 2.76:1
KAA, KHN, KHR, RFD, FMA, RMC, RMF 3.21:1
KDA, KDX, RCJ, RCM, RCN, RKA, RKB 3.40:1
R2A, TCA 3.42:1
KBT, KBF, KBY, KKF, KKK, RRA, RBB, RFH RJA, RJC, RJD, RUF, RJK, RJH, RMT, RNC(1) 3.73:1
RRC, RRD 3.75:1
KNH, KNK, KNM 4.09:1
KJA, KJH, KJU, KJK, KJM, KJR, KMA, KMC, KMM, KMR, KM2(1), RKF, RMW, RNB(1), RNJ(1), RNM(1) 4.10:1
KCH, KCS, KCW, RDA 4.11:1
KFM, KFT, KFO, KSA, KSC, KSJ, KSR, KST, KWH(1), RFS, RMY, RNA(1) 4.56:1
KWJ(1) 4.88:1
KTA 5.13:1
RSB 5.43:1
RTB 6.17:1
(1) Dana/Spicer built drive axles.
Locking Differentials

Code Ratio
RAB, RAD, RAH, RAK, RKF, RWA 2.76:1
KAB, KAT, KAW, KAR, RXA 3.07:1
RMB, RMY 3.21:1
DKY, RCK, RKC, RKD 3.40:1
KBH, KBR, KBN, KBX, KBZ, KBU, KKH, KKM RFU, RJB, RJJ, RJM, RMU 3.73:1
KNJ, KNN 4.09:1
KJB, KJN, KMB, KMD, KMU, KMN, RFM 4.10:1
KCF, KCJ, KCT 4.11:1
KFS, KSB, KSD, KSK, KSO, KSS, RFT, FMZ 4.56:1