![]() The 12-bolt O-axle shafts will interchange with some of the 8.2's,but they need to have the same bearing design.The 64-65 8.2" BOP rears were also 5/8" narrower on each side,so you can only use one of the narrower shafts from one of those types of rears. The late-69/1970 Vistas used a SET-10 roller bearing,with the 9912 outer seal This is also the same bearing/seal design as the 71-72 Vista 10-bolts. This is the same bearing/seal design as the 71-72 8.5" 10-bolts. The 1970 Cutlass/442 used the SET-9 roller bearing,with the 712146 outer seal. The 68-69 Vistas used an RW-507-G sealed ball-bearing,with an inner seal.This is a goofy bearing,& hard to find,& expensive. The 12-bolt O-axle actuall has 4 different axle bearings throughout the different years.Ħ7-69 Cutlass/442 used the RW-507-CR sealed ball-bearing,with the 8594S inner seal. This same rear later became known as the 10-bolt corporate,like what is in the Grand Nationals. The 71-72 Cutlass/442 8.5" 10-bolt rears use the same ring & pinion sets as the 71-72 Skylark/GS. It has a smooth 12-bolt cover,with an 8.5" 10-bolt ring gear,& bolt-in axles.This particular rear is unique to itself,as the parts do not interchange with any other type of rear. You should also not get confused with the 12-bolt O-axle.This is Oldsmobiles version of a 12-bolt.They made it from 1967-1970,for the Cutlass/442. The second style came under 71-72 Cutlass/442's built in Lansing,as well as some of the other plants.This style has a large "O" on each side of the pumpkin,frontside,where the axle tube goes into the pumpkin.This has a round cover,with a protruding rib,going from 12:00 to 3:00.īoth of these have a 10-bolt cover,with an 8.5" 10-bolt ring gear,bolt-in axles,& a yoke that uses bolts & straps.The aftermarket girdle covers will fit both of these styles. This style came under some 71-72 Cutlass/442's,depending on what plant they were built at. There is the style that I have seen under ALL of the 71-72 Buicks,which has a large letter "A" cast onto the top of it,& has a smooth cover with notches at 3:00 & 9:00. There are also 2 different castings for the pumpkins,which may make it a little confusing for someone looking for an 8.5" 10-bolt. ![]() I have "heard" that some 72 Lemans/GTO's had them,but I have always seen the 8.2's in them. If you pull the cover and it has spring and clutch posi, it has been put in after manufacture. * A second measurement to check is centerline distance between spring perch seats. (Note: Other sources put the total width at 61.125" to 61.25".) Axle tube flange-to-flange is 55.25 inches. * 1968-72 Chevelle rear end housings measure 58.5 inches from flange to flange, and with the brake drums in place, the total width is 62.5 inches. Axle tube flange-to-flange is 54.25 inches. The housing measures 53.25 inches from backing plate to backing plate and with the brake drums in place, the total width is 60.00 inches. Width info is below.ġ964-67 Chevelle rear ends were manufactured by the Chevrolet Gear and Axle Division. 2 is second shift and I haven't found any reference to the W. C = Buffalo NY assembly plant, 259 is the 259th day of 1971 = Thursday, Sept 16th build date. The GFC 259 2W breaks down like this GF=3.08 ratio. The H51 is a casting date code of August 5th 1971 for a 72 application. The 69277 matches a Chevelle 10 bolt but is missing the 39 prefix ? OK, the research I did on Team Chevelle indicates this SHOULD be an early 1972 8.2 axle.
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