Checked my diff # is JA G200 4 part number on casting is 1236542 B 10 bolt diff can,t find it in Camaro tech Diff ID is it wrong?
http://www.camaros.net/forum/cool.gif http://www.camaros.net/forum/cool.gif

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Barry
70 1/2 RS Z-28
69 Z-28 Crossram
69 RS SS 396 Convert
69 RS ProStreet 638 G.M.
70 LS6 Chevelle

1974 Nova rear end
JA = 2.73 open rear
G = Detroit Gear and Axle
200 = 200th day of the year
Go to www.novaresource.com (http://www.novaresource.com)

Threy have it listed there.
Jeff 67/68 & 69 RS's

Here's more info....

JA 41-15 (2.73) non-locking
10 bolt cover
8-1/2" ring gear
1974 Buick Apollo
1973-74 Chev Nova
1973-74 Pontiac Venture II (multi-leaft springs)

JA 41-17 2.41 non-locking
10 bolt cover
8-1/2" ring gear
1980 Buick
1980 Olds

Source-Hollander Interchange 1960-89

Thanks guys end of story!!

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Barry
70 1/2 RS Z-28
69 Z-28 Crossram
69 RS SS 396 Convert
69 RS ProStreet 638 G.M.
70 LS6 Chevelle