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All the 7.4 and 8.1 suburbans I've ever worked on cam with the 9.5 or 10.5 differentials, the 1500 has the standard 8.5 diff. The big blocks also used the 4L80E trans and not the 4L60E trans that the 1500 has. Obviously it will fit in the chassis but they used the heavy duty parts for a reason.
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