Axles and Gear Ratios
Dana 27 axles were used for the front and rear wheels in the 80 and 800 models until circa 1968. Both front and rear differentials were offset to the passenger side for the purpose of lining up the driveshafts with the Dana 18 transfer case. With the transition to the 800A model, the rear axle was upgraded to a Dana 44, with a centered differential mated to the Dana 20 transfer case (which had replaced the Dana 18). Some Scouts from this transitional time are a mix of old and new designs, with the rear driveshaft running at an angle. The front axle was still a Dana 27 model, though if the buyer ordered the 3500 lb. axle option the front axle was upgraded to a hybrid unit built from a Dana 30 centersection and 27 tubes. The V8 engine option included an automatic upgrade to the heavier duty Dana 30 axle. The rear axle shafts changed from two pieces to one piece circa 1968 or 1969. A Powr-Lok limited slip differential was provided as an option for both front and rear axles. Common gear ratios are 3.31, 3.73, 4.27, though nearly any ratio was available by special order (there is at least one instance where a Scout 800 was shipped with a 5.71).
In Scout IIs, Dana 30 front axles and Dana 44 rear axles were standard until 1974, with front Dana 44 axles as a special order. After 1974 Dana 44 front and rear axles became standard on all Scout IIs. Available gear ratios were 2.72, 3.07, 3.31, 3.54, 3.73, 4.09, 4.27 and 4.54. Trak-Lok limited slip differentials were optional.
Axles originally had a tag bolted to their differential cover stamped with their gear ratio, but this tag often rusted off over time or was intentionally removed. The Line Setting Ticket can be checked to identify the axle model, gear ratio, and whether it is equipped with a traction device, using an International parts code book.
Read more about this topic: International Harvester Scout
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