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Ford 9-Inch Third Member Assembly (28-Spline)

Complete, ready-to-run, drop-in nodular iron case 9-inch third member set up for 28-spline axles. Options include choice of differential type and gear ratio

***CONFIGURE OPTIONS TO SEE FULL PRICE***

Estimated Lead Time: 3-5 days
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$901.00
PROP 65 WARNING:

Complete Currie 9-inch third members, make it easy to update your street rod, muscle car or truck with a new gear ratio or performance differential. Every Currie 9-inch third member includes a new nodular iron gear case, bearings, seals, solid pinion bearing spacer, pinion support, 1330-series yoke, and choice of gear ratio and limited slip, locking differentials or spool. 

All Currie 9-inch third members are assembled in-house by our team of experienced professionals and are shipped ready to be installed.

 

Currie 9-inch Third Member Features:

Sportsman gear case   Gear Case - New Currie Sportsman 9-inch nodular iron gear case with 3.062 bore carrier bearings that are compatible with 28 or 31-spline axles
     
Nodular pinion support   Pinion Support - New nodular iron standard pinion support
     
Nodular 1330 Yoke   Pinion Yoke - New 1330 Series short nodular iron pinion yoke
     
Master Bearing Kit   Master Bearing kit - New Timken master bearing kit with seals and solid pinion spacer
     
Labor  

Labor - Fully assembled and set up in-house by skilled professionals

 

9-inch Third Member Options:

9-inch ring and pinion   Gear Ratios - Select from a wide range of ratios. Currie uses only the highest quality Motive Gear Performance® series (Orange box) ring and pinion sets
     
Trac Lock Posi   Differential Options - Selection of 28-spline standard open differential, Traction Lock, or Eaton Truetrac

 

Differential Options Explained

Trac LockThe Trac Lock is a classic clutch style limited slip differential. When the unit is new the clutches provide a torque bias that applies power to both axles equally under acceleration. When the vehicle goes around a corner, the clutches provide a limited slip that allows the wheels to spin at different rates. Modern tire grip and high horsepower can easily overpower the clutch bias and cause the unit to behave more like an open differential that a limited slip.  Trac Locks require periodic maintenance as normal driving wears the clutches and reduces the bias.

Truetrac  - The Truetrac is a helical gear limited slip differential (LSD), are the modern replacement for the classic clutch style limited slip differential. Under normal driving conditions, helical gear LSDs operate as a standard or open differential, allowing one wheel to spin faster or slower as necessary without the noise or harsh operation of a clutch style limited slip. When a drive wheel begins to slip, the helical gears inside the differential automatically engage, transferring torque to both rear wheels to maximize traction. When the wheels regain traction, the differential resumes normal operation. Unlike traditional clutch type limited slip differentials, helical gear LSD require no special oil additive or maintenance to replace worn and tired clutches, as these units have no wearable parts, require no special maintenance and maintain their torque bias for the life of the unit.

Complete Currie 9-inch third members, make it easy to update your street rod, muscle car or truck with a new gear ratio or performance differential. Every Currie 9-inch third member includes a new nodular iron gear case, bearings, seals, solid pinion bearing spacer, pinion support, 1330-series yoke, and choice of gear ratio and limited slip, locking differentials or spool. 

All Currie 9-inch third members are assembled in-house by our team of experienced professionals and are shipped ready to be installed.

 

Currie 9-inch Third Member Features:

Sportsman gear case   Gear Case - New Currie Sportsman 9-inch nodular iron gear case with 3.062 bore carrier bearings that are compatible with 28 or 31-spline axles
     
Nodular pinion support   Pinion Support - New nodular iron standard pinion support
     
Nodular 1330 Yoke   Pinion Yoke - New 1330 Series short nodular iron pinion yoke
     
Master Bearing Kit   Master Bearing kit - New Timken master bearing kit with seals and solid pinion spacer
     
Labor  

Labor - Fully assembled and set up in-house by skilled professionals

 

9-inch Third Member Options:

9-inch ring and pinion   Gear Ratios - Select from a wide range of ratios. Currie uses only the highest quality Motive Gear Performance® series (Orange box) ring and pinion sets
     
Trac Lock Posi   Differential Options - Selection of 28-spline standard open differential, Traction Lock, or Eaton Truetrac

 

Differential Options Explained

Trac LockThe Trac Lock is a classic clutch style limited slip differential. When the unit is new the clutches provide a torque bias that applies power to both axles equally under acceleration. When the vehicle goes around a corner, the clutches provide a limited slip that allows the wheels to spin at different rates. Modern tire grip and high horsepower can easily overpower the clutch bias and cause the unit to behave more like an open differential that a limited slip.  Trac Locks require periodic maintenance as normal driving wears the clutches and reduces the bias.

Truetrac  - The Truetrac is a helical gear limited slip differential (LSD), are the modern replacement for the classic clutch style limited slip differential. Under normal driving conditions, helical gear LSDs operate as a standard or open differential, allowing one wheel to spin faster or slower as necessary without the noise or harsh operation of a clutch style limited slip. When a drive wheel begins to slip, the helical gears inside the differential automatically engage, transferring torque to both rear wheels to maximize traction. When the wheels regain traction, the differential resumes normal operation. Unlike traditional clutch type limited slip differentials, helical gear LSD require no special oil additive or maintenance to replace worn and tired clutches, as these units have no wearable parts, require no special maintenance and maintain their torque bias for the life of the unit.

 

Selecting the right differential for your rearend build is an important decision that will be with you for a very long time - if you get it right. 

Below are short, not-too-technical, overviews of some of the most frequently asked about differential options for Hot Rods, Muscle Cars, and Muscle Trucks.

 

 

       

Detroit Truetrac - Helical-gear limited-slip (worm differential) is the modern replacement for the classic clutch-type posi. Under normal light throttle driving conditions, a Truetrac operates much like a standard open differential, allowing the rear wheels to rotate at slightly different speeds for smooth cornering. However, when accelerating (torque applied), the six helical-gears inside the unit smoothly and quietly engage, applying torque to both rear wheels equally, maximizing traction (think two equal length black stripes). Unlike a traditional clutch-type posi, a Truetrac requires no special oil additive or maintenance. With silky-smooth positive operation and no components to wear out, the Truetrac maintains day-one performance for the life of the unit.

 

 

 

    

 

Trac-Lok/Posi-Trac – Clutch-type limited-slip (Posi), offered as original equipment in many GM and Ford performance cars, these units rely on clutches (friction plates) to transfer power to the wheels. In operation, the clutches slip just enough to allow for smooth cornering while engaging with more force as power (torque) is applied, driving both wheels equally. When used in a daily driver, these units function well; however, as the miles add up or with aggressive driving or track use, the clutches and other internal components will become worn and severely degrade performance. Luckily, rebuild kits are widely available so that these units can be restored to like-new performance. Additionally, if the vehicle sits for extended periods, the clutch plates can stick together, causing the unit to chatter and clunk until gear oil works its way in between the clutch plates. A friction modifier must be added to the gear oil to help prevent the clutches from moaning or chattering during normal driving.
 

 

 

    

Detroit Locker - Automatic "ratcheting-style" differential is known for its reliability, rugged construction, and fully-locked performance on any surface. When power (torque) is applied in either forward or reverse directions, the unit locks both axles together like a spool. When coasting or rolling through a corner (no torque applied), the unequal speed of the inside and outside wheels causes the unit to unlock momentarily, before abruptly locking when power is applied. At the heart of the locker are two, spring-loaded forged steel side plates (one per axle) with large square-edged teeth that engage and disengage a matching center spider block. The interaction of the side plates and spider block teeth creates the signature ratcheting sound of the unit. The Detroit Locker is best suited for off-road or severe track use where maximum traction is required, and quiet/smooth operation is less important.