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913A315 Detroit Truetrac Differential GM 12-Bolt
InfoVehicle Info Needed
DETROIT TRUETRACPART NUMBER: 363-913A315

913A315 Detroit Truetrac Differential GM 12-Bolt

$74699
ShippingShips on 11/18/2026
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$33300
Made in USA
Posi Traction Differential for GM Truck 12-Bolt, 30-Spline

555-62810

Posi Traction Differential for GM Truck 12-Bolt, 30-Spline

$41399

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Heavy-Duty Nitrile Gloves [7 mils Thick, X-Large]

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75W-90 Multi-Purpose Synthetic Gear Oil [1 Quart]

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75W-90 Multi-Purpose Synthetic Gear Oil [1 Quart]

Part Number : 555-28050
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Limited Slip Additive [4oz Bottle]

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GM 12-Bolt
Detroit Truetrac Differential
  • GM 12-Bolt
  • 1964-1982 GM Truck
  • 30-Spline Axles
  • 8.875" Diameter Ring Gear
  • Fits 3.73 & Up Gear Ratios
  • Rear Axle
  • Steel
  • Sold Individually

    Detroit TrueTrac 913A315 Differential Features:

    • Ring gear ratio: 3.73 & up
    • Differential type: Limited Slip (LSD)
    • Axle shaft diameter: 1.300 in.
    • Ring gear size: 8.875 in
    • Gear spline tooth count: 30
    • Improved traction relative to other rear wheel and four wheel drive vehicles
    • Maintenance free - requires no special lubrication or friction modifiers
    • Lifetime torque bias retention
    • Simple, proven design
    • Smooth and quiet operation
    • Limits wheel spin-out and improves handling
    • Performs open, until needed



      • Enhance Your Vehicle's Driving Experience with a Trutrac Differential

      The Detroit Truetrac is a helical-gear-style performance differential that maximizes wheel traction and enhances driving and handling characteristics. These units operate as a standard or open differential under normal driving conditions and are smooth, quiet, and automatic. They will engage without any driver's knowledge or action required providing worry-free performance.

    Part TypeDifferential Carrier
    Product LineDetroit Truetrac Differentials
    BrandDETROIT TRUETRAC
    Package Height8.3
    Package Width8.5
    Package Length8.8
    Weight25.45 PG
    Part CategoryPerformance Parts
    Vendor Part Number913A315
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews
    Please click here to download the instructions PDF file

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    Some parts are not legal for use in California or other states with similar laws / regulations
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