12 Bolt 'O' Type (FULL SIZE CARS)


Symmetrical 12 bolt cover
U-bolts on yoke
U-bolts on yoke

FULL SIZE POSI
1/4 cut slugs bolt in axles
1/4 cut slugs bolt in axles

Ring Gear Diameter

9.375 Olds 'O' TYPE REAR

Casting number

Not IDed yet

Cover Bolt Count

12

Ring Gear Bolt Count

12

Ring Gear Bolt Size

7/16 right hand (early) and Left hand thread (Late)

Axle Spline

31 bolt in axle

Pinion Spline

28 (67-70) and 30 (71-76) 

Yoke Style

U Bolt & Nut Universal Joint retention (reference picture)

1971-1975 round bolt flange

Pinion Diameter

1.875

Axle Shaft Diameter

1.563 press on bearing


Supported Cars

Car

Year

DELTA 88, ROYALE

66-76

OLDS 98 Wagons

69-76

Buick 455 CI Electra, Riviera, Wagons

Pontiac 455CI Catalina, Bonneville, Grandville, Wagons

 

1971-1976

 


Rebuild Kit

Part

Part Number

Carrier Bearing

LM501349

Carrier Bearing (Race)

LM501314

Inner Pinion Bearing

M804049

Inner Pinion Bearing (Race)

M804010

Outer Pinion Bearing

M88048

Outer Pinion Bearing (Race)

M88010

Pinion Seal

2043


Mega Axle Bearing Kit

Part

Part Number

Axle Bearing 65-67 SEALED BEARING

514003P

Axle seal 65-67 INNER TUBE SEAL

8940S

Axle Bearing 68-70 SEALED BEARING

88131R

Axle seal 68-70 INNER TUBE SEAL

8940S

Axle Bearing 71-75 OILED BEARING

SET 10

Axle seal 71-75 AXLE MOUNTED SEAL

2689S