Light Duty Truck Rear Axle Identification
Chevrolet Light Duty Trucks use either Chevrolet, Dana, or Rockwell produced rear axle assemblies. See examples of production codes below:CHEVROLET AXLE
Example:
BN3 G 001 1
Axle Code Source Code Day Code Shift Code
C = Buffalo Jan. 1 = 001 1st shift
G = Gear & Axle
Code is stamped on top of right axle tube outboard of carrier.
DANA AXLE
Example:
603560-1 9 29 5 B 4
DANA MONTH DAY MODEL SHIFT PRODUCTION
P/N CODE CODE YEAR CODE LINE CODE
Code is stamped on rear surface of right axle tube.
The Chevrolet produced axles use a prefix code stamped into the axle tube for axle code identification. Dana produced axles use the same prefix code as the Chevrolet axles, but they display these codes on a strip of tape attached to the outboard end of the axle tube.
1985 "C" 10-30 REAR AXLE IDENTIFICATION
STD.AXLE L/D AXLE AXLE BRAKE GEAR
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
C100 BN3 - 2.56 11 x 2 8.5 3750 DETROIT G & A
BR3 CC3 2.73
BS3 CD3 3.08
BT3 CF3 3.42
BU3 BFH 3.73
BW3 - 2.56 11.15 x 2.75
BX3 CJ3 2.73
BY3 AZ3 3.08
BZ3 BA3 3.42
CA3 BFJ 3.73
C100 CK3 CS3 2.73 11 x 2
V8+ CM3 CT3 3.08
M20 BJK BFM 3.73
CN3 CU3 2.73 11.15 x 2.75
CR3 CW3 3.08
HBR HBS 3.42
BFN BFR 3.73
C20903 BDB - 3.23 11.15x2.75 9.5 5700
BBJ BBF 3.42
BCY BFC 3.73
BCZ BJA 4.10
C20903 BDC - #3.23 13 x 2.50 6000
20906 BBK BBH 3.42
(EXC BFA BDA 3.73
LE8) BJC BJB 4.10
BKC BKD 4.56
(W/LE8) GMA - 3.21 10.5
GMB GMC 3.73
GMD GMF 4.10
C20943 GMG - 3.21 7500
GMH GMJ 3.73
GMK GML 4.10
GMM GMN 4.56
C30903 GGF - 3.21 13 x 3.50
30943 GGG GGP 3.73
31003 GGH GGR 4.10
31403 GGJ GGT 4.56
C31003 GGK - *3.21 DETROIT G & A
31403 GGL GGO 3.73 DUAL WHEEL
30943 GGM GGW 4.10
GGN GGX 4.56
C30903 GLH GLK 3.73 DETROIT G & A
30943 GLJ GLM 4.10 DUAL WHEEL
GLL GLN 4.56 WIDE TRACK
# 3.23 RATIO NOT AVAILABLE ON C20906
* 3.21 RATIO NOT AVAILABLE ON C30943
1985 "K" 10-30 REAR AXLE IDENTIFICATION
STD.AXLE L/D AXLE AXLE BRAKE GEAR AXLE
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
K100 BB3 BH3 2.73 11.15x2.75 8.5 3750# DETROIT G & A
BC3 BJ3 3.08 EX 06
BD3 BK3 3.42 4000#
BF3 BM3 3.73
K100 BRA BRB 2.73
V8+ BSA BSB 3.08
M20 CX3 CZ3 3.42
CY3 DA3 3.73
K20903 BDD - 3.23 9.5 5700
BBC BBA 3.42
BCW BFD 3.73
GDL GDK 4.10
BDF - 3.23 13x2.50 6000
K20903 BBD BBM 3.42
20906 BCX BFF 3.73
BHK BJD 4.10
K30903 GGY GHF 3.73 13x3.50 10.5 7500
30943 GGZ GHG 4.10
31003 GHA GHH 4.56
K30943 GHB GHJ 3.73 DETROIT G & A
31003 GHC GHK 4.10 DUAL WHEEL
314003 GHD GHL 4.56
K30903 GLH GLK 3.73 DETROIT G & A
30943 GLJ GLM 4.10 DUAL WHEEL
GLL GLN 4.56 WIDE TRACK
1985 "G" 10-30 REAR AXLE IDENTIFICATION
STD.AXLE L/D AXLE AXLE BRAKE GEAR
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
G100 BRC BRF 2.73 11x2 8.5 3500# DETROIT G & A
BSC BSF 3.08
BBN BBS 3.42
BFU BFX 3.73
G100 BRD BRH 2.73 11.15 x 2.75
G200 BSD BSH 3.08
BBR BBT 3.42
BFW BFY 3.73
G31305-6 HHB HBC 3.73 13x2.50 9.5 5700
31303-32 HBD HBF 4.10
G31303-6 HBG HBH 3.23
31332
G31303 HBJ HBK 4.56
31332
GLP - 4.10 13x3.50 9.75 6200
GLR - 4.56 DETROIT G & A
G31603 GLS - 4.10 DUAL WHEELS
31632 GLT - 4.56
G31303 GLU GLX 4.10 10.5 7500
31603 GLW GLY 4.56
31632
1985 S-T 10 REAR AXLE IDENTIFICATION
STD.AXLE L/D AXLE AXLE BRAKE GEAR
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
S100 GNH GNS 3.08 9.5 x 2 7.5 2600 BUFFALO G & A
GNM GNX 3.08
GNJ GNT 3.42
GNN GNY 3.42
GNK GNU 3.73
GNP GNZ 3.73
GNL GNW 4.11
GNR GNA 4.11
T100 HCC HCG 3.42 2700
HCB HCF 3.73
HCA HCD 4.11
1985 M-VAN REAR AXLE IDENTIFICATION
STD. AXLE L/D AXLE AXLE BRAKE GEAR
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
M10905 FSA FSD 4.11 9.5 7.5 2900 BUFFALO G & A
M10905 FAA FBA 2.56
M10906 FCA FCB 2.73
FFA FFB 3.08
FMA FMB 3.42
FRA FRB 3.73
1985 "P" 20-30 REAR AXLE IDENTIFICATION
STD. AXLE L/D AXLE AXLE BRAKE GEAR
MODEL CODE CODE RATIO SIZE DIA. RATING AXLE MFR.
P20842 BYC BFC 3.73 11.15x2.75 9.5 5700 DETROIT G & A
21042 BCZ - 4.10
BFA BDA 3.73 13x2.50 6000
BJC
- 4.10
P30842 GMP GMR 3.73 10.5 7900
31042 GMS - 4.10
31442 GMT GMU 4.56
GMW GMX 3.73 13 x 3.50
GHM - 4.10
GHN GHP 4.56
P30842 GHR - 4.10 DETROIT G & A
31042 GHS GHT 4.56 DUAL WHEEL
31442 GHU 5.13*
31842 30832 31132 31432 31832
P30842 GNA - 5.29 13.75x1.53 12.0 11000 ROCKWELL
31042 DISC DUAL WHEEL
31442
P31432 GMB - 4.56 10.5 10000 DANA
31832 GNC - 4.88 DUAL WHEEL
GND 5.13
*5.13 RATIO AXLE NOT AVAILABLE ON MOTOR HOME CHASSIS 032 MODELS.