12 Bolt 'O' Type

'O' type posi U-bolts on yoke Ssymmetrical 12 bolt cover 1/4 cut slugs bolt in axles
'O' type posi U-bolts on yoke Symmetrical 12 bolt cover 1/4 cut slugs bolt in axles

Ring Gear Diameter  8.4 Olds
Cover Bolt Count  12
Ring Gear Bolt Count  10
Ring Gear Bolt Size 7/16 right hand thread / aftermarket gears 7/16 left hand thread
Axle Spline 28   bolt in axle 60 degree spline 

31   bolt in axle (SPECIAL 67-68 SUPER DUTY OPTION)

Pinion Spline 27
Yoke Style U Bolt & Nut Universal Joint retention (reference picture)
Pinion Diameter 1.625 <<<< AFTERMARKET GEARS ARE AVAILABLE FOR 12 BOLT OLDS

(For 3 series carrier only)

Axle Shaft Diameter 1.382  press on bearing

 

Supported Cars

Car Year
442 67-68  
Cutlas 442 (USA ONLY) 69-70

 

Rebuild Kit

Part Part Number
Carrier Bearing LM501349
Carrier Bearing (Race) LM501314
Inner Pinion Bearing M802048
Inner Pinion Bearing (Race) M802011
Outer Pinion Bearing 86649
Outer Pinion Bearing (Race) 86610
Pinion Seal 2043

 

Mega Axle Bearing Kit

Part Part Number
Axle Bearing   67-68 SEALED BEARING RW507CR
Axle seal         67-68 INNER TUBE SEAL 8594S
Axle Bearing   69-70 OILED  BEARING A9
Axle seal         69-70 EXTERNAL SEAL 712146