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Aluminum Ultra Case Assembly
HD 40 Spline Lightweight Steel Spool
35 Spline Pro Gear & Chrome Moly Yoke

$1,919.00 $1,727.10

Part Number: PRF225

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

Check 9 1/2″ Gear Diagram If Selecting That Option

Includes:

N1912
Strange 3.812″ Bore Ultra Case
206-T4 heat treated aluminum case
Billet aluminum main caps
Solid steel adjuster nuts

N1950A
Billet Aluminum Tapered Bearing Pinion Support
Provisions to accept 5/16″-24 computer sensor – Two locations

D2002
Heavy Duty 40 Spline Lightweight Steel Spool
Bearing journal increased to 2.250″ for additional load capacity

Choice of 9″ 3.40-4.86 35 Spline Pro gear
9 1/2″ gears are available as an option

For 10″ Pro Gear – See PRF225-10

U1604 & U1610
Chrome Moly 1350 Series Yoke with U-bolts

Professionally Assembled
Timken® Bearings & Races
ARP Ring Gear Bolts

Options

9 1/2″   3.25-5.14 Pro Gear………….. OPRF23

Aluminum 40 spline spool………….. OPRF29
Aluminum yoke…………………………… OPRF13

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

Load bolt…………………………………….. N1910H *

* Can’t be used with lightened gear

Lighten ring gear…………………………. D3596
MicroBlue gear set………………………. D3598G
MicroBlue gear & bearings………….. OPRF42

Pick-up collar
1 magnet……………………………………… U1614
2 magnet……………………………………… U1614-2
4 magnet……………………………………… U1614-4
8 magnet……………………………………… U1614-8

Lightened case sensor bracket…….. N1952S

 

Guidelines and Torque spec

Description

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 bearings are outside the case.

To further reduce flex the pinion support has a very precise fit to the case bore. This, 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 PRF215 Ultra Third Member with a 28 spline pinion gear is an option for those who need the use of those particular gear ratios.

Additional information

Weight 71.05 lbs