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Strange 12 Bolt Street Rear End
With Heavy Duty Posi & Leaf Spring Mounts


Part Number: PRG310

Custom made to your specifications
Factory or custom widths available at no additional charge
Choice of housing ends and leaf spring mounts
Professionally welded and assembled
Crated to protect your investment

Information Required

Factory Bolt-in
Year, Make, & Model of vehicle
Factory / Custom width (Specify)
Mounts – Single leaf / Multi leaf / Other (Specify)
Type of brakes – OEM Drum / Aftermarket *
If aftermarket, specify manufacturer & part number *
Bolt circle & stud choice
Gear ratio

Custom Application
Axle flange to axle flange width *
Housing end to housing end width *
Type of housing ends *
Pinion offset
Type of leaf spring mounts & location
Brake manufacturer & part number *
Brake register *
Axle flange diameter *
Bolt circle & stud choice
Gear ratio

* If purchasing rear end with brakes, this information in not required
Please supply wheel mounting surface to wheel mounting surface

Gear Selection
3.08 / 3.42 / 3.55 / 3.73 / 3.90 / 3.91
4.11 / 4.30 / 4.56 / 4.88 / 5.14 / 5.38 / 5.57

Assembly Includes

12 bolt housing with leaf spring mounts installed – H12FLE
30 spline Alloy axle package – P3104
4 1/2″, 4 3/4″, or 5″ bolt circle
Choice of press-in or screw-in stud kit – A3130 / A1035 / A1025 / A1026
Standard gear set
Eaton HD clutch style posi – R5087 / R5086
Choice of gear ratio
S-Series pinion yoke – U1602
Pinion yoke u-bolt kit – U1610
Chrome steel cover – R5199
Bottle of friction modifier (Clutch units only)
Fully crated – No extra charge


30 spline Eaton True Track……. OPRG05 *
33 spline Eaton True Track……. OPRG06 *
Chrome moly yoke………………… OPRG17
LPW aluminum cover……………. OPRG10
Black powder coat housing… H1199P-BLK

* Available in 3 series only

Supply 2 qts Lucas gear oil…… OPGL2Q

Wilwood Street Brake Kits
With 11″ rotors…………………….. B2709WC *
11″ for staggered shocks……… B2710WC *
With 12″ rotors…………………….. B2708WC *

* There is a $25 labor charge to install brake kit


This product is only available from an Authorized Strange Dealer or Factory Direct Call - 800-646-7618 or Email Us

Parts List and Installation Guide pdf File


Strange Street 12 Bolt Rear End With Heavy Duty Posi & Leaf Spring Mounts

This durable Chevy 12-bolt rear end package includes leaf spring mounts.

This Strange GM 12-bolt rear end is available with your choice of housing ends and custom widths.

The Strange 12 bolt casting is much stronger than the OEM 12 bolt, while still accepting the same components. The casting is poured from proprietary nodular iron which is substantially stronger than cast iron. The main caps are constructed from forged chrome moly, instead of cast iron like the originals. These improvements in materials, have allowed the casting to be made not only thinner and lighter, but also stronger. The casting has a torque arm mount cast as part of the case and a location for a Strange 3 channel sensor.

Additional information

Weight 0.01 lbs