The Detroit Truetrac performs like an open differential under normal driving conditions and automatically transfers torque to the wheel with better traction when ground conditions call for it. Because of the proven helical gear design, maintenance is not required as there are no clutches, cones or friction plates to wear out and no friction modifier to add.

Whether you’re cruising on the street, competing at the strip, or driving to work the Detroit Truetrac is the performance choice limited slip differential.

AMC 20
for vehicles built from 1968 to present with AMC model 20 axles
• Model (912A579) for ring gear ratios 3.08 & up
• Model (912A573) for ring gear ratios 2.73 & down

Chrysler 9 1/4"
axles for Van's, Pick Up's & SUV's built from 1973 to present
• Model (913A368) will fit 31 spline axles for all ratios

Chrysler 8.25
• For axles 1997 to present
• 29 spline
• Fits C-clip axles
• All ratios
• Detroit Truetrac Model# 912A553 (Part# 52688)

Chrysler 8.75
• For axles 1957 to 1974
• 30 & 33 spline

Ford 10.25”/10.5” axles built between 1983 and 2005 and used in such vehicles as F/E-250/350 -(98’& Up Super Duty)-Pickup, Van and Excursion.
• Model (#915A550) will fit 35 spline axles with all axle ratios.

GM 10 Bolt
7.5 & 7.6 C-clip axles
vehicles built between 1976 & 2005.
• Model (#912A317)
will fit 28 spline axles with axle ratios of 3.23 & higher built between 1988-2005.
• Model (#911A319)
will fit 26 spline axles with axle ratios of 3.23 & higher built between 1976-1988.
• Model (#911A415) will fit 26 Spline axles with axle ratios of 3.08 & lower built between 1976-1988.

GM 12 Bolt
Designed specifically for car applications
• 33 spline
Tractech Model No. 914A575
4.10 & up “4 series” gear ratio

GM 12 Bolt
Designed specifically for high performance car applications
• 33 spline
Tractech Model No. 914A564
3.08-3.90 “3 series” gear ratio

Toyota , Tacoma, Tundra & T100
• 8.4” axle 1995 ½ to Present Model No. 913A541

Ford 7.5
• For axles 1983 to present
• 28 spline
• Fits C-clip axles
• All ratios
• Detroit Truetrac
Model# 912A316

Ford 8.8"
(Please note the part number’s and assembly numbers’s that have
been changed and the new number’s that replace them.)

Model: ford 8.8” (7/8 cross pin) 31 spline, rear axle
obsolete interim new
part # 913a311 913a558 913a561
assembly # 51369 52646 52670
Model: ford 8.8” (3/4 cross pin) 28 spline, rear axle
obsolete interim new
part # 913a361 912a559 912a562
assembly no. 51376 52649 52676
Model: ford 8.8” (3/4 cross pin) 28 spline, front axle
interim new
part # 912a548 912a563
assembly # 52652 52679

The Detroit Truetrac performs like an open differential under normal driving conditions and automatically transfers torque to the wheel with better traction when ground conditions call for it. Because of the proven helical gear design, maintenance is not required as there are no clutches, cones or friction plates to wear out and no friction modifier to add.

Whether you’re cruising on the street, competing at the strip, or driving to work the Detroit Truetrac is the performance choice limited slip differential.

AMC 20
for vehicles built from 1968 to present with AMC model 20 axles
• Model (912A579) for ring gear ratios 3.08 & up
• Model (912A573) for ring gear ratios 2.73 & down

Chrysler 9 1/4"
axles for Van's, Pick Up's & SUV's built from 1973 to present
• Model (913A368) will fit 31 spline axles for all ratios

Chrysler 8.25
• For axles 1997 to present
• 29 spline
• Fits C-clip axles
• All ratios
• Detroit Truetrac Model# 912A553 (Part# 52688)

Chrysler 8.75
• For axles 1957 to 1974
• 30 & 33 spline

Ford 10.25”/10.5” axles built between 1983 and 2005 and used in such vehicles as F/E-250/350 -(98’& Up Super Duty)-Pickup, Van and Excursion.
• Model (#915A550) will fit 35 spline axles with all axle ratios.

GM 10 Bolt
7.5 & 7.6 C-clip axles
vehicles built between 1976 & 2005.
• Model (#912A317)
will fit 28 spline axles with axle ratios of 3.23 & higher built between 1988-2005.
• Model (#911A319)
will fit 26 spline axles with axle ratios of 3.23 & higher built between 1976-1988.
• Model (#911A415) will fit 26 Spline axles with axle ratios of 3.08 & lower built between 1976-1988.

GM 12 Bolt
Designed specifically for car applications
• 33 spline
Tractech Model No. 914A575
4.10 & up “4 series” gear ratio

GM 12 Bolt
Designed specifically for high performance car applications
• 33 spline
Tractech Model No. 914A564
3.08-3.90 “3 series” gear ratio

Toyota , Tacoma, Tundra & T100
• 8.4” axle 1995 ½ to Present Model No. 913A541

Ford 7.5
• For axles 1983 to present
• 28 spline
• Fits C-clip axles
• All ratios
• Detroit Truetrac
Model# 912A316

Ford 8.8"
(Please note the part number’s and assembly numbers’s that have
been changed and the new number’s that replace them.)

Model: ford 8.8” (7/8 cross pin) 31 spline, rear axle
obsolete interim new
part # 913a311 913a558 913a561
assembly # 51369 52646 52670
Model: ford 8.8” (3/4 cross pin) 28 spline, rear axle
obsolete interim new
part # 913a361 912a559 912a562
assembly no. 51376 52649 52676
Model: ford 8.8” (3/4 cross pin) 28 spline, front axle
interim new
part # 912a548 912a563
assembly # 52652 52679