Aluminum Ultra Case Assembly

Strange has developed the 206-T4 heat treated Aluminum Ultra Third Member for racers who value maximum gear life. The design moves both pinion bearings into the case, offering far greater support to other designs where the outer bearing is outside the case.

To further reduce flex the pinion support has a very precise fit to the case bore. Then coupled with an oversized tail bearing the pinion gear is held firmly in place. This hold the pinion gear in proper alignment with the ring gear even under the most extreme conditions.

This case can utilize 9” and 9 1/2” ring gears, and can use 10” development gears with the proper pinion support. Strange Ultra Centers have a provision to use an optional load bolt if required.

The 3.812” bore Ultra case is designed for a heavy duty lightweight 40 spline steel spool that features a thicker wall on the bearing journal to eliminate the possibility of collapse under the most abusive conditions. It also allows the use of a aluminum 40 spline spool were applications permit.

The 3.812” is available in a special lightened version with a ball bearing pinion support commonly used in Pro Stock cars. Ball bearing supports are an option on non-lighten cases as well. For a Funny car requiring a coupler cover, a support with a built-in cover is an option. A special 4.00” bore case is available to suit the Strange L6000 Drop-out Live Axle.

Strange Ultra Third Member PRF225 with 35 Spline pinion gears is an option for those who need the use of those particular gear ratios.

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

Ultra Case – 3.812″ Bore
• 206-T4 heat treated aluminum
• Billet aluminum main caps
• Solid steel adjuster nuts

Tapered Bearing Pinion Support – N1950A
• Billet aluminum
• Drilled & tapped for computer pick-up sensors
• (2) 5/16″-24 and (2) 3/8″-24
• Clear anodized for corrosion resistance

Heavy Duty 40 Spline Lightweight Steel Spool – D2002
• Machined from forged steel
• Bearing journal increased to 2.250″
• Provides additional load capacity
• Broached 40 spline with 45° pressure angle

Choice of 28 Spline Pro Gear
For 35 Spline Pro Gear – See PRF225

Chrome Moly Yoke – U1603
• Fits 1350 series u-joint
• Supplied with u-bolts – U1610

Professionally Assembled
• Timken® Bearings & Races
• ARP ring gear bolts

Options
Aluminum 40 spline spool – OPRF29
1350 Billet chrome moly yoke – OPRF08
1480 Billet chrome moly yoke – OPRF20
HD yoke cap kit – OPRF37
Taper / ball pinion support – OPRF26
Lightened case with ball support – OPRF25
Lighten ring gear – D3596
Load bolt – N1910H
(Can’t be used with lightened gear)

Pick-up Collar
1 magnet – U1613
2 magnet – U1613-2
4 magnet – U1613-4
8 magnet – U1613-8

Lightened case sensor bracket – N1952U