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Axle Specifications (Early Bronco)

Early Bronco Axle Specifications

Rear Axle Specifications

  • '66-'75, 28 spline, big bearing
    short side: 26 15/16" long side: 29 1/4"

  • '66-'75 28 spline, small bearing
    short side: 27 1/8" long side: 29 5/8"

  • '74-'75 28 spline, big bearing/small brakes
        short side: 27 1/4" 			long side: 29 3/4" 

  • '76- '77 28 spline, big bearing/big brakes
        short side: 27 3/16"                    long side: 29 11/16" 

Brake Specifications

66-75 small bearing
10 x 2.5

74-75 medium duty
10 x 2.5

66-77 large bearing
11 x 1.75

76-77
11 x 2.25

Rear Axle Bearings

Application *Seal Bearing I.D. O.D.

69-78 Bronco 2780 and 2900lb 9568 rw-207-ccra 1.3780 2.8346

69-78 Bronco
2780 and 2900lb 9568 rw-207-ccra 1.3780 2.8346

69-77 Bronco
3300lb 51098 514003 1.5312 3.1496

Tapered Roller Bearing 3195 a-20 1.5625 3.1483

Axle Shaft Seals

71-77 Bronco
5131

66-71 Bronco (from 3/18)
480570

66 Bronco (to 3/17)
40652s

EB rear axle info:

Code Weight Rating Ratio Type (Locking really = Limited Slip, not a real locker)

A3 2780/2900* 4.11 Locking

A4 2780 4.57 Locking

A5 3300 4.11 Locking

A6 3300 4.57 Locking

B8 2780/2900* 3.50 Locking

B9 3300 3.50 Locking

03 2780/2900* 4.11 Non-Locking

04 2780 4.57 Non-Locking

05 3300 4.11 Non-Locking

06 3300 4.57 Non-Locking

08 3300 3.50 Non-Locking

18 2780/2900* 3.50 Non-Locking

19 3300 3.50 Non-Locking

  • 2900 lb axle replaced 2780 lb axle for 1976-1977
    3300 lb axle = large bearing 
    2780 lb axle = small bearing 
    Not sure about 2900 lb axle

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