Dana
AxleThe Model 60-1U, Model 70-2U, and Model 80 rear axles feature the following:
- semi-floating or full-floating axle shafts on Model 60-1U rear axles
- full floating axle shafts on Model 70-2U and Model 80 rear axles
- an integral-type differential housing consisting of a cast center section with two steel tubes
- a stamped differential housing cover
- a hypoid-design differential ring gear and pinion with the centerline of the pinion set below the centerline of the differential ring gear
- drive pinion bearing preload shims to maintain pinion bearing preload
- a selective outboard spacer, located between the differential bearing cups and the differential housing, and a selective differential bearing shim located between the differential bearings and the differential case to adjust differential bearing preload and differential ring gear backlash
- conventional or limited-slip differential assemblies on Model 60-1U and Model 70-2U rear axles
- a conventional differential assembly on Model 80 rear axles
- an embossed metal tag identification tag, bolted to the differential housing cover
The Model 60 differential clutch packs have clutch discs with concentric grooves and clutch plates with radial grooves. The Model 70 Power-Lok (R) differential has paper-coated clutch packs. Prior to assembly, soak the clutch packs for 20 minutes in Additive Friction Modifier C8AZ-1913546-A or equivalent meeting Ford specification EST-M2C118-A. Arrangement of these plates and discs is at the option of the vehicle manufacturer. During disassembly, note the arrangement of these components to maintain their order during assembly.
Each differential clutch pack is pre-measured to assure correct stack height. Do not separate the differential clutch packs and intermix the clutch plates and clutch discs from other differential clutch packs.
In diagnosis of vehicle operator complaints, two things must be recognized:
- If, with unequal traction, both wheels slip, the limited-slip has done all it can possibly do.
- In extreme cases of differences in traction, the wheel with the least traction may spin after the limited-slip has transferred as much torque as possible to the non-slipping wheel.