First Digit | Second & Third Digits | |||||||||
Diameter of | Code | Gear Ratio | Code | Gear Ratio | Code | Gear Ratio | Code | |||
Ringgear | ||||||||||
138mm | A | 3.300 | 01 | 3.364 | 27 | 3.356 | 48 | |||
145mm | B | 3.360 | 02 | 4.300 | 28 | 3.729 | 49 | |||
6.25" | C | 3.545 | 03 | 4.100 | 29 | 3.400 | 50 | |||
6.62" | D | 3.556 | 04 | 3.727 | 30 | 3.736 | 51 | |||
7.1" | E | 3.700 | 05 | 3.909 | 31 | 3.722 | 52 | |||
7.5" | F | 3.889 | 06 | 6.591 | 32 | 3.250 | 53 | |||
8" | G | 3.900 | 07 | 4.807 | " | 3.941 | 54 | |||
9" | H | 4.111 | 08 | 7.503 | 33 | 3.333 | 55 | |||
9.25" | J | 4.222 | 09 | 5.583 | " | 2.821 | 56 | |||
9.5" | K | 4.375 | 10 | 6.781 | 34 | 4.058 | 57 | |||
10.5" | L | 4.444 | 11 | 4.786 | " | 3.238 | 58 | |||
12.5" | M | 4.625 | 12 | 7.636 | 35 | 3.234 | 59 | |||
13.5" | N | 4.790 | 13 | 5.600 | " | 3.519 | 60 | |||
14" | P | 4.875 | 14 | 4.778 | 36 | 2.724 | 61 | |||
12" | Q | 5.125 | 15 | 3.583 | 37 | 2.892 | 62 | |||
162mm | R | 5.286 | 16 | 3.417 | 38 | 2.655 | 63 | |||
6.38" | S | 5.600 | 17 | 3.154 | 39 | 4.312 | 64 | |||
6.7" | T | 5.714 | 18 | 5.375 | 40 | 3.837 | 65 | |||
6" | U | 5.833 | 19 | 3.308 | 41 | 3.071 | 66 | |||
10.6" | V | 6.167 | 20 | 6.500 | 42 | 3.526 | 67 | |||
15.5" | W | 6.667 | 21 | 3.550 | 43 | 3.095 | 68 | |||
142mm | X | 6.780 | 22 | 3.214 | 44 | 4.176 | 69 | |||
158mm | Y | 6.833 | 23 | 3.533 | 45 | 5.857 | 70 | |||
202mm | Z | 7.640 | 24 | 2.928 | 46 | 2.962 | 71 | |||
no ringgear | - | 4.556 | 25 | 2.929 | " | 3.949 | 72 | |||
5.571 | 26 | 3.944 | 47 | 4.285 | 73 | |||||
Fourth Digit | ||||||||||
Number of | Code | Limited Slip | ||||||||
Pinions | ..meaning | |||||||||
2 | 2 | NO | T312 = 6.7" Ringgear, 3.909 Ratio and 2 spider NO LSD | |||||||
2 | 3 | YES | G295 = 8" Ringgear, 4.100 ratio and 4 spider LSD. | |||||||
4 | 4 | NO | -474 = NO ringgear (FWD) 3.944 Ratio and 4 spider NO LSD | |||||||
4 | 5 | YES | P194 = someone just sold you a truck diff…..OOOPS! |
A03A
It seams regardless of model, most diff codes are A03A or something very similar. I can't work it out. Similaror the same code on a Hino truck to that on a Landruiser or Corolla. As far as I know, that last letter referes to LSD or not.
A = non LSD
B = LSD
Please let me know if you know more.