HD Pro Aluminum Center Section
With L/W Steel Spool, Standard Gear & Chrome Moly Yoke


Part Number: PRF184

This Center Section May Not Fit Your Housing
Please refer to housing clearance diagram

HD Pro Case
3.062″ bore – 31 or 33 spline
3.250″ bore – 35 or 40 spline
• Manufactured from 206-T4 heat treated aluminum
• 12% higher yield and 32% higher tensile strength compared to 356-T6
• Large oil channel provides optimal lubrication to pinion bearings
• Heavily reinforced tail bearing area
• Chrome moly studs encapsulated by billet aluminum main caps
• Solid adjuster nuts
• Accepts over-sized tail bearing for heavy loads and high RPM

• Forged aluminum tapered bearing pinion support
• Pinion seal retaining plate and snap ring
• Races installed
• Support bolts, washers, and O-ring

Lightweight Steel Spool
31, 33, or 35 spline – D1553 / D1554 / D1555

Standard Gear Set
3.00-6.50 ratio

Chrome Moly Yoke & U-BoltsU1603 / U1610
Designed for 1350 series U-joint

• Professionally Assembled
• Timken® Bearings & Races
• Grade 8 Ring Gear Bolts
• Ships in protective shipping container & HD cardboard box

40 spline steel spool – OPRF01

H.D. U-joint cap kit – OPRF37

Taper/ball pinion support – OPRF03
Lighten ring gear – D3596
Load bolt – N1910H
(Load bolt can’t be used with lightened gear)

1 magnet pick-up collar – U1613
2 magnet pick-up collar – U1613-2
4 magnet pick-up collar – U1613-4
8 magnet pick-up collar – U1613-8
Sensor bracket – N2300S

  • Total


Aluminum Third Member With Steel Spool

Aluminum Pinion Support with Spool, Standard Gear, and 1350 Series Yoke

The Strange HD Pro Ford 9 inch Aluminum Third Member With Sppol is designed for Drag Race applications and for the most abusive Hi-Performance street/strip applications.

As with all Strange aluminum cases, it is crafted from 206-T4 heat treated aluminum. This premium aluminum has a 12% higher yield strength and a 32% higher tensile strength compared to commonly used 356-T6 aluminum.

The billet aluminum pinion support has a unique oil channel that is machined 360º into the support to maximize oil flow to the pinion bearings as well as a large slot in the front to further boost oil circulation. The support is in contact with the bore of the case in two locations as opposed to one as found in normal cases. This additional contact area holds the pinion shaft much more securely resulting in better bearing and gear life. The tail bearing is oversized to handle more load and greater RPM than a stock tail bearing. Billet aluminum main caps encapsulate chrome-moly studs, provide the utmost support for the carrier bearings and significantly reduce ring gear deflection.

There are several upgrade options available for differentials, and yokes for this aluminum third member.

Guidelines and Torque spec

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