1966 Ford Mustang Axle Information & Ratios
The first table is the code and gear ratio. If you know your axle tag number, simply go to the second table.
| Axle code |
Ratio & type |
| 6 |
2.80 open differential |
| F |
2.80 locking differential |
| 2 |
2.83 open differential |
| B |
2.83 locking differential |
| 1 |
3.00 open differential |
| A |
3.00 locking differential |
| 3 |
3.20 open differential |
| C |
3.20 locking differential |
| 4 |
3.25 open differential |
| D |
3.25 locking differential |
| 5 |
3.50 open differential |
| E |
3.50 locking differential |
| 8 |
3.89 open differential |
| H |
3.89 locking differential |
| 9 |
4.11 open differential |
| I |
4.11 locking differential |
|
|
Years 1965 – 1968
| Year |
Tag Code |
Type |
Ring Gear Diameter |
Ratio :1 |
Ring Teeth |
Pinion Teeth |
| 1966 |
WCZ-E |
Conventional |
7.75 |
2.8 |
42 |
15 |
| 1966 |
WDJ-B |
Limited Slip |
7.75 |
2.8 |
42 |
15 |
| 1966 |
WCX-F |
Conventional |
8.0 |
3.00 |
39 |
13 |
| 1966 |
WDJ-C |
Limited Slip |
8.0 |
3.00 |
39 |
13 |
| 1966 |
WCZ-S |
Conventional |
8.75 |
3.50 |
35 |
10 |
| 1966 |
WCZ-R |
Conventional |
8.75 |
3.89 |
35 |
9 |
| 1966 |
WDZ-A |
Limited Slip |
7.75 |
2.80 |
42 |
15 |
| 1966 |
WDW-C |
Conventional |
8.0 |
3.25 |
39 |
12 |
| 1966 |
WDW-E |
Conventional |
7.75 |
2.80 |
42 |
15 |
| 1966 |
WDW-A |
Conventional |
7.75 |
2.80 |
42 |
15 |
| 1966 |
WDW-D |
Conventional |
8.00 |
3.50 |
35 |
10 |
| 1966 |
WDZ-C |
Limited Slip |
8.00 |
3.25 |
39 |
12 |
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