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Axle - Dana 25/27 Specifications
 
 
Dana 25 - Front Axle 
Ring Gear Size:
7.75"
Gears Ratios Available: 4.27, 4.88, 5.38, 6.17
The D25 came with three different styles of axle shaft joints, the Cardan-Cross style being the best.

Military vehicles with the Dana 25 include the MB, M38, M38A1, and M170. CJs with the Dana 25 include the CJ-2A, CJ-3A, CJ-3B, CJ-5, CJ-5A, CJ-6, and CJ-6A. The Willys Wagon and Willys Pickup used the Dana 25, but obviously the two wheel drive Wagons and Pickups did not use it.

The CJs used a small drum brake around 9" in diamber. The Willys Wagons and Willys Pickup used larger brakes (11"x2"). The Willys Wagon and Willys Pickup version is also much wider than the CJ version.

 
Model/Version
Spring Pads
Wheel to Wheel
 Years
Dana 25/Military
28"
51"
'41-'65
Dana 25/CJ
28"
51"
'46-'65
Dana 25/Willys Wagon
28"
n/a
'46-'65
Dana 25/Willys Pickup
28"
n/a
'47-'65
Dana 25/FC Trucks
n/a
n/a
'57-'65
Dana 25/Wagoneer
n/a
n/a
'62-'65

 


 

Dana 27 - Front Axle 
Ring Gear Size:
7 1/5"
Gears Ratios Available: 3.54, 3.73, 4.10, 4.27, 4.88, 5.38
Many parts of the Dana 27 interchange with the Dana 25. The Dana 27 normally came with the superior Cardan-Cross u-joint type axle shafts, but carrier bearing and ring and pinion are smaller than the Dana 25.

The CJ models that used the Dana 27 include the CJ-5, CJ-5A, CJ-6, and CJ-6A. I have heard rumors that M38A1s were always built with the Dana 25, but I have not been able to confirm this.

 
Model/Version
Spring Pads
Wheel to Wheel
 Years
Dana 27/CJ
28"
51"
'66-'71
Dana 27/M38A1
28"
51"
'66-'71
Dana 27/Wagoneer
n/a
n/a
'66-'73
Dana 27/Jeepster/Commando
n/a
n/a
'66-'71