HD PRO Center Sections and Cases

HD Pro Aluminum Case with Differentials, Spools & Yokes

 

PRF182: The HD Pro Aluminum case with a lightweight steel spool and Standard gear is used when weight savings and gear life are both very important. This case will offer much greater gear life than OEM cast and nodular iron units, while drastically reducing weight. A typical application is a Dragster or Altered that is still able to get sufficient life out of a Standard gear. This package includes the HD Pro case and support, lightweight steel spool, Standard gear, and female coupler. Upgrades available are a 40 spline L/W steel spool or 35 spline aluminum spool. Options include a ball bearing pinion support, lightened ring gear, MicroBlue service, computer pick-up collar, polished case and support, and load bolt. If shock loads are going to be more extreme, the PRF188 which contains a Pro gear would be the better choice.

PRF186: The HD Pro Aluminum case with a lightweight steel spool and 28 spline Pro gear is used when weight savings and gear life are both very important and shock loads are too high for a Standard gear. The case and pinion support design offer a very stout foundation to support the spool and gear set. The tail bearing is oversized further adding to the support of the pinion. Solid mount Dragsters and Altereds are the most common applications. This package includes the HD Pro case and support, lightweight steel spool, 28 spline Pro gear, and female coupler. Upgrades are available including a 35 spline 9” Pro gear, 9 1/2” Pro gear, 40 spline spool, and 35 spline aluminum spool. Options include a ball bearing pinion support, lightened ring gear, MicroBlue service, computer pick-up collar, polished case and support, and load bolt. For extreme conditions such as Alcohol Dragster or Funny Car, the PRF190 would be the better choice due to the spool design.

PRF190: This center section features a HD Pro Aluminum 3.812” bore case and a special heavy duty lightened 40 spline steel spool. The spool has a thicker wall on the bearing journal to eliminate any possibility that the journal could collapse under extreme conditions. It has extended internal splines which allow the continued use of the same 40 spline axles, even if replacing a competitor’s 40 spline center section. The case, pinion support, and spool design create a ridged fixture to keep the ring and pinion in proper alignment. The oversized tail bearing further adds to the support of the pinion. This package includes the HD Pro case and support, HD lightened 40 spline steel spool, 28 spline Pro gear, and female coupler. Upgrades available are a 35 spline 9” Pro gear, 9 1/2” Pro gear, and 40 spline aluminum spool. Options include a ball bearing pinion support, lightened ring gear, MicroBlue service, computer pick-up collar, polished case and support, and load bolt.

STRANGE HD PRO ALUMINUM CASES 

The HD Pro aluminum case 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. This case is most commonly purchased in kit form due to some of the unique components. The kit contains the case, pinion support with races, support bolts and o-ring, depth shims, tail bearing and retainer plate. The remainder of the parts necessary for a complete unit are readily available. The kits are available in 3.062”, 3.250”, and 3.812” bore sizes, and for tapered or ball bearing pinion support. Bearings are not included in these kits other than the tail bearing. This case will accept 9” and 9 1/2” gear sets.