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The only info I have is from an interchange manual
SA - 1978 2.29 locking (48-21)
10 bolt cover
7-1/2" ring gear
1978 Cutlass
1978 Gran Prix
B - Axle mfg plant is Buick
270 - Calendar day of year
2 - Built on the second work shift on that day _________________ Mike
2005 Cadillac CTS
2008 GMC SLT E. Cab Z71
AMSOIL Jobber
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