Axle Codes
(Differential Ratios)
Have you ever wondered if a previous owner has switched out the axle on your Cougar for something a little more agressive? Maybe they wanted something that would help them get off the line faster and then beefed up the Cougar a bit. Or maybe you are buying a Cougar and want to know if the axle that is on the car is orignal. That is what this page is for.
If you want to know what kind of axle you have on your Cougar , or want to restore your Cougar back to orignal and need to know what the car orignally came with from the factory, then check out the codes below.
1967 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 0 | 2.79 |
| 1 | 3.00 |
| 2 | 2.38 |
| 3 | 3.20 |
| 4 | 3.25 |
| 5 | 3.50 |
| 6 | 2.80 |
| 8 | 2.75 |
1
| Axle Code | Locking Differential |
| A | 3.00 |
| C | 3.20 |
| D | 3.25 |
| E | 3.50 |
| H | 3.89 |
| I | 4.11 |
1968 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 1 | 2.75 |
| 2 | 2.79 |
| 4 | 2.83 |
| 5 | 3.00 |
| 6 | 3.20 |
| 7 | 3.25 |
| 8 | 3.50 |
1
| Axle Code | Locking Differential |
| E | 3.00 |
| F | 3.20 |
| G | 3.25 |
| H | 3.50 |
| X | 3.91 |
| Y | 4.30 |
1969 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 3 | 2.79 |
| 4 | 2.80 |
| 5 | 2.83 |
| 6 | 3.00 |
| 8 | 3.20 |
| 9 | 3.25 |
| A | 3.50 |
| E | 4.30 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| L | 2.79 |
| M | 2.80 |
| N | 2.83 |
| O | 3.00 |
| Q | 3.20 |
| R | 3.25 |
| S | 3.50 |
| V | 3.91 |
| W | 4.30 |
1970 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 3 | 2.79 |
| 4 | 2.80 |
| 5 | 2.83 |
| 6 | 3.00 |
| 8 | 3.20 |
| 9 | 3.25 |
| A | 3.50 |
| E | 4.30 |
| F | 2.33 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| M | 2.80 |
| O | 3.00 |
| R | 3.25 |
| S | 3.50 |
| V | 3.91 |
| W | 4.30 |
| X | 2.33 |
| Y | 4.11 |
1971 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 3 | 2.79 |
| 4 | 2.80 |
| 6 | 3.00 |
| 9 | 3.25 |
| A | 3.50 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| M | 2.80 |
| O | 3.00 |
| R | 3.25 |
| S | 3.50 |
| V | 3.91 |
1972 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 3 | 2.79 |
| 4 | 2.80 |
| 6 | 3.00 |
| 9 | 3.25 |
| A | 3.50 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| M | 2.80 |
| O | 3.00 |
| R | 3.25 |
| S | 3.50 |
| V | 3.91 |
1973 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 3 | 2.79 |
| 6 | 3.00 |
| 9 | 3.25 |
| A | 3.50 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| L | 2.79 |
| O | 3.00 |
| R | 3.25 |
| S | 3.50 |
1974 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 6 | 3.00 |
| 9 | 3.25 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| O | 3.00 |
| R | 3.25 |
1975 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| 6 | 3.00 |
1
| Axle Code | Locking Differential |
| R | 3.25 |
1976 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
1
1977 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 1 | 2.50 |
| 2 | 2.75 |
| 6 | 3.00 |
| 7 | 3.40 |
1
1978 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 1 | 2.50 |
| 2 | 2.75 |
| 7 | 3.40 |
| 8 | 2.73 |
| B | 2.47 |
1
| Axle Code | Locking Differential |
| J | 2.50 |
1979 Mercury Cougar
| Axle Code | Non-Locking Differential |
| 2 | 2.75 |
| B | 2.47 |
| G | 2.26 |
1
| Axle Code | Locking Differential |
| K | 2.75 |
| O | 3.00 |
1980 Mercury Cougar
| Axle Code | Non-Locking Differential |
| B | 2.47 |
| F | 3.45 |
| G | 2.26 |
| Y | 3.08 |