Home/
Registry/
Mercury/
Cougar/
1967-1970/
1968 Mercury Cougar/
Photo
supermotors.net/registry/media/1137905
1968 Ford 4-Pinion Locking Differential Assembly & Model Usage - Mustang Cougar
Reference · 1967-1970 CougarAll 6 service procedures
Service procedure for assembling a Ford 4-pinion locking differential, including the shim template, ring-gear ratios by model, torque specs and the C6AZ-19580-C hypoid lube requirement.
Part of 1967-1970 Mercury Cougar Service Procedures
This page is from a Ford service publication introducing the "New 4-Pinion Locking Differential" (Traction-Lok). It provides numbered assembly steps 6 through 20 covering installation of shaft lock pins, pre-load springs and plate, insertion of a 0.050 shim pack, stacking of friction and steel clutch plates (soaked 30 minutes in Ford Hypoid Lubricant C6AZ-19580-C), compressing the clutch pack with a locally obtained bolt/washer setup torqued 10-15 ft-lbs, using shim template tool T68P-4946-A with a feeler gauge to select proper shims, pressing the case halves together, torquing ring gear bolts to 65-80 ft-lbs, and performing a bench torque check (100-250 ft-lbs with new plates, 40 ft-lbs minimum with re-used plates). A Model Usage Chart (Figure 2) lists applications: Fairlane and Montego passenger cars with 390-2V/4V and 428-4V C.J. engines (tags WFC-A/B/C, ratios 3.50, 3.91, 4.30:1, 9" ring gear) and Mustang and Cougar with 427-4V (Cougar only, C6 automatic) plus 390 and 428 C.J. (tags WFD-A/B/C, same ratios). Tables also give torque specifications and hypoid lubricant requirements (ESW-M2C104-A spec, 5 pints, filled to bottom of filler plug hole).
Is this accurate? Sign in to help verify it.
Frequently asked questions
- What ratios and service tags were available for the Mustang and Cougar 9-inch locking differential?
- Service tags WFD-A (3.50:1), WFD-B (3.91:1), and WFD-C (4.30:1), all with a 9" ring gear. The 427-4V with C6 automatic application was Cougar only.
- What torque do the ring gear bolts require?
- Torque the ring gear bolts evenly and alternately across the diameter to 65-80 ft.-lbs.
- How long should new clutch plates be soaked before installation?
- Soak new clutch plates in Ford Hypoid Lubricant (Ford Part No. C6AZ-19580-C) or equivalent for approximately 30 minutes before installation.
- What is the bench check torque specification for the locking differential?
- With new plates, 100 to 250 ft.-lbs (rotating torque may fluctuate up to 40 ft.-lbs); with original/re-used plates, 40 ft.-lbs minimum.
- What lubricant and quantity does the differential require?
- Ford Specification ESW-M2C104-A (C6AZ-19580-C), 5 pints, service refilled to the bottom of the filler plug hole.
No comments yet.