Correct axle bearings/seals '70 GS 455


New Member
I've found conflicting information on this subject. Can anyone help me out with replacements for stock, bolt in axles & where to find them? thanks for your help
According to my 74 parts manual, the 1970 the 10 bolt cover axle housing used in the 40 series, (yours), should use part number 1234624. Your car should have the first of the "Corporate 10 bolts". These can be identified from the BOP 10 bolts by having a round diff cover, not having the cover with the indented sides.

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Buick Master Parts book from 1970 shows the bearing w/retainer part no is 7451895. The 1972 edition shows it updated to 7451959. Pictures of some 7451959 boxes on eBay show the bearing industry number of NDH U1578ZJJRA. A GM supercedure book shows a still later no of 9428059. These are all for the 10-bolt
rear axle cover design. This is a type "B" rear axle. shows to have the 7451895 in stock. shows to have an SKF bearing no BR9 that replaces the GM numbers. It was not searchable by the Buick or Chevy applications however.

More results can be found by searching these 3-GM part nos. There were lots of applications for other GM brands which may not show Buick usage.
The seal shows up in the Buick Master Parts book as no 1234498. A GM supercedure caralog shows it changed to 1255938 about 1/82. shows they carry a Timken seal no 712146 that is the same as the Buick nos. It doesn't turn up by searching Buick applications. Their site seems to revert to the 12-bolt Chevy type "C" clip-in axle types or a Pontiac type. shows to have the seals under the GM nos.

Regular bearing supply houses like Motion Industries should carry a fresh stock of the Timken seal.

There are plenty of examples on line by searching the web using the GM nos. It might be good to check the age of these if possible. Some items might tend to leak prematurely from old age.


Active Member
If your differential is still together, you can tear it down and all the bearings and seals have part numbers on them and those numbers can be used to get new ones.