It uses a 7 3/4" ring and pinion that is only available in 4.27:1, 4.88:1, 5.38:1, and 6.17 ratios. The Dana 25 came with 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. The picture on top is from a 1950 CJ-3A with the small brakes. The picture below is from a 50s Willys Wagon with the large 11"x2" brakes. The Willys Wagon and Willys Pickup version is alos much wider than the CJ version.

Specs

Dana 41

The Dana 41-2 was used in the CJ-2A after serial number #13453 in early '46 and it was used in the CJ-3A until serial number #37549 (late '50). Looking at the diff cover, it appears as tall as a Dana 44, but not as wide. It was also used in Willys Wagons and Jeepster VJs during this time period.

Dana 44

Several variations of the Dana 44 have been used as the rear axle in Jeeps, all of them use a 8.5" ring and pinion. The Dana 44s with the two piece shafts are 19 spline or 27 spline and the versions wih the once piece shafts are 30 spline.

The R&P ratio ranges supported by the carriers are 2.87-3.73 and 3.92-5.89. Not all ratios are available for all the variations of the Dana 44.

CJ Dana 44

Before 1972 all CJ Dana 44s had an offset differential since the Dana 18 transfer case has the rear output shaft offset to the passenger side. Before mid 1970, they used a 19 spline or 27 spline, two piece axle shaft. After mid 1970, they used a superior 30 spline flanged axle shaft.

The Dana 44 was introduced in the CJ line on the CJ-3A starting with serial number #37549 (late '50). Earlier CJ-2As and CJ3As did not use the Dana 44.

Starting in 1972, the Dana 20 transfer case was used which has the rear output shaft centered, so the rear axle has the differential in the center. From 1972-1975 the Dana 44 was used with a 30 spline flanged axle shaft. This Dana 44 uses 11" drum brakes and the most common ratio is 3.73.

After '76, the AMC 20 was the the only axle used in CJs with two exceptions. Some CJ-7s with the Borg-Warner Quadra-Trac transfer case came with a 30 spline, one piece shaft, offset, narrow track Dana 44. The other exception is in 1986, when CJ production was coming to a close AMC 20s were in short supply, so they used wide track Dana 44s in some of the '86 models. Bolt on compatible with any '76-'86 CJ, but wider than earlier narrow tack AMC 20s. Use of the Dana 44 in 1986 began somewhere between serial numbers ending with 049379 and 054173. The axles were flanged, but I'm not sure of the spline count. Common ratios were 2.73 and 3.31.

All CJ Dana 44s use a 5 on 5.5" wheel bolt pattern.