Lightweight Aluminum Case Assembly Aluminum Support with Lightweight Steel Spool Standard Gear & Chrome Moly Yoke


Part Number: PRF155

Complete Center Section Includes:

N1901 / N1904
3.062″ Bore Lightweight Aluminum Case for 31 or 33 spline
3.250″ Bore Lightweight Aluminum Case for 35 or 40 spline

• High Tensile Strength Aluminum Alloy Case
• Forged Aluminum Main Caps
• Solid Steel Adjuster Nuts

Billet Aluminum Tapered Bearing Pinion Support
Over sized bearings and races

D1553 / D1554 / D1555
Lightweight steel spool in 31, 33, or 35 spline

Choice of 3.00-6.50 Standard Gear

U1603 & U1610
Chrome moly 1350 Series Yoke with U-bolts

Professionally Assembled
Timken® Bearings & Races
Grade 8 Ring Gear Bolts


40 Spline Steel Spool……………. OPRF01
Ball Bearing Support……………. OPRF03

Lighten Ring Gear…………………. D3596
MicroBlue Gear Set……………… D3598G
MicroBlue Gear & Bearings….. OPRF42

Pick-up collar
1 magnet…………….. U1613
2 magnet…………….. U1613-2
4 magnet…………….. U1613-4
8 magnet…………….. U1613-8
Sensor bracket……..N1927S



The Lightweight Aluminum case with a lightened steel spool and Standard gear set can be used where weight is critical, the vehicle is light, and impact loads are relatively low. Drag Race applications include 4-link Super Comp Dragsters, Altereds, Comp, and lightweight door cars. This package contains the Lightweight aluminum case, Strange billet aluminum pinion support (N1922), lightweight steel spool, Standard gear, and chrome moly 1350 yoke with u-bolts. Upgrade available is a 40 spline L/W steel spool. Options include a ball bearing pinion support, lightened ring gear, MicroBlue service, and computer pick-up collar. Higher horsepower vehicles, especially those using a throttle stop, will opt for the PRF165 which contains a Pro gear. It is also very common to upgrade to a 40 spline L/W steel spool.

STRANGE LIGHTWEIGHT ALUMINUM CASE Lightweight aluminum cases are ideal for vehicles where unsprung weight is extremely critical and gear life is not a major concern. Dimensionally very similar to the Pro Iron case, but uses high tensile aluminum alloy and forged aluminum main caps. Since the case is responsible for holding together the gear set and spool, the application should be carefully considered before a purchasing this case. Typical Drag Race applications are Super Comp Dragsters, Altereds, and very lightweight cars. This case is not recommended for Street or Street/Strip. A Strange Engineering associate will be happy to assist you with your decision. Available bore sizes are 3.062” and 3.250”.


N1922: Heavy duty Drag Race pinion support. It uses even larger front and rear pinion bearings than the Daytona or N1917, further increasing load capabilities to suit the most demanding requirements. Manufactured from billet aluminum, it offers better grain flow than billet aluminum supports. Oil channels have been reduced to allow more material around the race sections to maximize rigidity. It can accept either 28 or 35 spline pinion gears, and comes in a clear anodized finish. A polished support is also available. The support is supplied with front and rear Timken races installed, bolts, washers, and an o-ring. Bearing & seal kit is available separately. Manufactured from 2024-T4 billet aluminum.

Guidelines and Torque spec

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