here are the factory spec's - eaton Truetrac Differential Fits 9" Ford With 31 Spline Axles
Part Number: N1979– Ford 9″ with 31 spline axles
Description
Eaton 31 Spline Detroit Truetrac
A helical gear differential that offers smooth power transfer Features
high Torque Biased Mechanical Unit
• Helical gear design
• Smooth, automatic operation
• Clutchless & maintenance free
DO NOT USE SYNTHETIC GEAR OIL
Will adversely affect unit operation
Use Only Petroleum Based 80W-90 or 85W-140 Gear Oil
fit's all 9" housing with 3.062" side gears- below are the strange center numbers
S-Series case…………………….. N2205
Pro Iron case…………………….. N1905
HD Pro Alum case kit………… P3200
this is the perfect street/strip unit you can buy - to handle BIG horsepower.
this is the last one I have at this price. the 1st $550.00 plus shipping get's it
this is the last one I have at this price. the 1st $550.00 plus shipping get's it!
Side bearings & races…. D1586 / D1588
Alloy axle package………. P3102 / P3104
Eaton Truetrac Differential Fits 9" Ford With 31 Spline Axles quantity
