Ford Differentials

The following information has been copied from the Ford 1978 Car Shop Manual Volume 1, Chassis.

Integral Carrier Axle-Conventional

Applies to Mustang II/Pinto/Bobcat

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WGB-K1..... 3.18:1..........6.75......... C2
WGB-U1..... 3.18:1..........6.75......... C2
WGF-AA..... 3.18:1..........6.75......... C2
WGF-AJ..... 2.73:1..........6.75......... C2

Integral Carrier Axle-Ford-(WER)

Applies to Ford/Mercury, Granada/Monarch

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WER-AA..... 2.47:1..........8.7.......... C2
WER-AB..... 2.47:1..........8.7.......... C2
WER-AC..... 2.47:1..........8.7.......... C2

Integral Carrier Axle-Ford-(WGX)

Applies To Fairmont/Zephyr

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WGX-A...... 2.73:1..........7.5.......... C2
WGX-B...... 3.08:1..........7.5.......... C2
WGX-C...... 2.47:1..........7.5.......... C2

Removable Carrier Axle-Ford

Driving axle identification - Lincoln Continental and Continental Mark V

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WGB-V...... 2.75:1..........9............ C2
WGB-W...... 3.00:1..........9............ C2
WGB-AB..... 2.50:1..........9............ C2
WGB-AD..... 2.75:1..........9............ C2
WGC-A...... 2.75:1..........9............ C2
WGC-K...... 2.50:1..........9............ C2
WGC-N...... 2.75:1..........9............ C2
WFV-T...... 2.75:1..........9............ T4
WFY-A...... 2.75:1..........9............ T4
WFY-K...... 3.00:1..........9............ T4

Driving axle identification - Ford and Mercury

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WDC-DW..... 2.75:1..........9............ C2
WDC-EB..... 2.75:1..........9............ C2
WDC-EE..... 3.00:1..........9............ C2
WDC-EH..... 2.75:1..........9............ C2
WDC-EK..... 3.00:1..........9............ C2
WDC-EL..... 2.50:1..........9............ C2
WDC-EM..... 2.50:1..........9............ C2
WFG-AL..... 3.00:1..........9............ T4
WFG-AA..... 2.75:1..........9............ T4
WFG-BJ..... 2.75:1..........9............ T4

Driving axle identification - LTD II, Cougar, and Thunderbird

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WEB-BF..... 2.50:1..........9............ C2
WEB-BK..... 3.00:1..........9............ C2
WEB-BM..... 2.75:1..........9............ C2
WFA-AA..... 3.00:1..........9............ T4
WFA-AH..... 3.00:1..........9............ T4
WFA-AL..... 2.75:1..........9............ T4

Driving axle identification - Mustang II, Pinto, Bobcat, Granada, Monarch and Versailles

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WDW-AB..... 2.79:1..........8............ C2
WDW-Z...... 3.00:1..........8............ C2
WDX-E...... 2.75:9..........9............ C2
WDY-AA..... 3.00:1..........8............ C2
WDY-HH..... 3.40:1..........8............ C2
WDY-S...... 3.40:1..........8............ C2
WFB-G...... 2.50:1..........9............ T4
WFB-K...... 2.50:1..........9............ T4

Traction-Lok Limited Slip Differential-Ford

Granada,Monarch,Versailles

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WFB-G...... 2.50:1..........9............ T4
WFB-K...... 2.50:1..........9............ T4

LTD II, Cougar, Thunderbird

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WFA-AA..... 3.00:1..........9............ T4
WFA-AH..... 3.00:1..........9............ T4
WFA-AL..... 2.75:1..........9............ T4

Lincoln Continental, Continental Mark V

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WFV-T...... 2.75:1..........9............ T4
WFY-A...... 2.75:1..........9............ T4
WFY-K...... 3.00:1..........9............ T4

Ford, Mercury

ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WFG-AL..... 3.00:1..........9............ T4
WFG-AA..... 2.75:1..........9............ T4
WFG-BJ..... 2.75:1..........9............ T4

Notes:

For Mavericks and Comets the Granada/Monarch/Versailles tables are the ones to use as these cars are based on a lengthened Maverick chassis.

Axle codes from data plates

These codes are assembled for 70s Ford using the '78 shop manual, '75 light maintenance manual, and The Mustang Recognition guide. codes are fairly stable from 1969 to 1978, notes are made where needed. Please double check any codes not in the years 1969-1973, 1975, and 1978 since I can only assume the codes remained the same in the years my sources do not cover.

Conventional......Lock......Ratio
     1.............J.........2.50
     2.............K.........2.75
     3.............L.........2.79
     4.............M.........3.18 ('78), 2.80 ('69-'72)
     5.............N.........3.07 ('75-'78) 2.83 ('69-'70)
     6.............O.........3.00
     7.............P.........3.40 ('73-'78) 3.10 ('69-'70)
     8.............Q.........2.73 ('78) 3.20 ('69-'70) 3.18 ('72)
     9.............R.........3.25 
     A.............S.........3.50
     B.............T.........2.47 ('78) 3.07 ('69-'72)
     C.............U.........3.55 ('72) 3.08 ('69-'70)
     D.............V.........3.91
     E.............W.........4.30
     F.............X.........2.33 ('70)
     G.............X.........3.55 ('73-'78)
     H.......................3.78 ('72)
     Y.......................3.08 ('78) 4.11 lock ('72)