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Ford 9-inch Lightweight Aluminum Third Member Assembly (35-Spline)

Complete, ready-to-run, drop-in lightweight aluminum case 9-inch third member set up for 35-spline axles. Options include choice of differential type, gear ratio

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

SKU: CE-4028ALK
Estimated Lead Time: 3-5 days
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Reduces friction, operating temperature and gear wear

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$1,090.00
PROP 65 WARNING:

Complete lightweight aluminum 9-inch third member set up for 35-spline axles. This unit is well suited for vehicles under 3,000 lbs with moderate horsepower and street tires. If you have a heavy vehicle, hi-horsepower and launch aggressively, the HD-Pro Aluminum 9-inch third member would be a better option

All Currie 9-inch third members are assembled by our in-house experts with decades of rearend setup and assembly experience, so you can trust the finished product

 

Currie 9-inch Third Member Features:

  Gear Case - Lightweight Strange Aluminum 9-inch gear case weighs just 13.69 lbs. compared to 27 lbs. for an iron case
     
  Pinion Support - Billet aluminum big bearing (Daytona) pinion support features a larger inner pinion bearing for increased strength and oil passageways designed for extended high-speed use
     
9-inch master Bearing Kit   Master Bearing kit - New Timken master bearing kit with seals and solid pinion spacer
     
Assembly 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 in our 9-inch crate rearends
     
9-inch Limited Slip   Differential Options - Choice of 35-spline helical gear limited slip, automatic locking differential or a steel spool
     
  Pinion Yoke - Choice of 1350 short yokes in forged steel, billet steel or billet aluminum 
     
Gear Polishing   REM® Isotropic Polishing - Removes surface imperfections created during the gear manufacturing process. Polishing eliminates the need for a break-in period, decreases friction, reduces operating temps and removes stress risers, to help gears last longer and run quieter

 

 

Differential Options Explained

Truetrac and Wavetrac - Helical gear limited slip differentials (LSD) are the modern replacement for the classic clutch style limited slip differential. Under normal driving conditions, HGLSDs 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, HGLSDs 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.

Detroit Locker - Automatic locking differential, designed to lock and unlock automatically when torque is applied in either forward or reverse directions when locked it acts like a spool driving both wheels equally. When coasting or rolling into a corner (no torque applied) the Detroit Locker unlocks and momentarily operates like an open differential permitting the wheels to rotate freely. When torque is applied, exiting the corner the unit locks and drives both wheels equally. The key benefits of the Detroit Locker, are its rugged construction and superb performance. The only negative is that the automatic lock and unlock operation can create a clunking sensation that can be both felt and heard in the vehicle.

Spool – The spool is the simplest and strongest option, but it lacks differential action, as both axles are joined together by the spool's solid center. Spools are not recommended for the street, as the place high twisting loads on the axles, increase tire wear and can negatively impact handling. Spools are typically only used for drag racing applications where straight-line performance is the only concern.

Complete lightweight aluminum 9-inch third member set up for 35-spline axles. This unit is well suited for vehicles under 3,000 lbs with moderate horsepower and street tires. If you have a heavy vehicle, hi-horsepower and launch aggressively, the HD-Pro Aluminum 9-inch third member would be a better option

All Currie 9-inch third members are assembled by our in-house experts with decades of rearend setup and assembly experience, so you can trust the finished product

 

Currie 9-inch Third Member Features:

  Gear Case - Lightweight Strange Aluminum 9-inch gear case weighs just 13.69 lbs. compared to 27 lbs. for an iron case
     
  Pinion Support - Billet aluminum big bearing (Daytona) pinion support features a larger inner pinion bearing for increased strength and oil passageways designed for extended high-speed use
     
9-inch master Bearing Kit   Master Bearing kit - New Timken master bearing kit with seals and solid pinion spacer
     
Assembly 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 in our 9-inch crate rearends
     
9-inch Limited Slip   Differential Options - Choice of 35-spline helical gear limited slip, automatic locking differential or a steel spool
     
  Pinion Yoke - Choice of 1350 short yokes in forged steel, billet steel or billet aluminum 
     
Gear Polishing   REM® Isotropic Polishing - Removes surface imperfections created during the gear manufacturing process. Polishing eliminates the need for a break-in period, decreases friction, reduces operating temps and removes stress risers, to help gears last longer and run quieter

 

 

Differential Options Explained

Truetrac and Wavetrac - Helical gear limited slip differentials (LSD) are the modern replacement for the classic clutch style limited slip differential. Under normal driving conditions, HGLSDs 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, HGLSDs 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.

Detroit Locker - Automatic locking differential, designed to lock and unlock automatically when torque is applied in either forward or reverse directions when locked it acts like a spool driving both wheels equally. When coasting or rolling into a corner (no torque applied) the Detroit Locker unlocks and momentarily operates like an open differential permitting the wheels to rotate freely. When torque is applied, exiting the corner the unit locks and drives both wheels equally. The key benefits of the Detroit Locker, are its rugged construction and superb performance. The only negative is that the automatic lock and unlock operation can create a clunking sensation that can be both felt and heard in the vehicle.

Spool – The spool is the simplest and strongest option, but it lacks differential action, as both axles are joined together by the spool's solid center. Spools are not recommended for the street, as the place high twisting loads on the axles, increase tire wear and can negatively impact handling. Spools are typically only used for drag racing applications where straight-line performance is the only concern.

 

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.