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Its is possible there has been a swap. But am wondering if it really was a Sub 2500 to start with and not rebadged like some people do. The ECU has the PCM built into it so if it had a 6.0 and a 5.3 was swapped providing it had the correct reluctor on the crankshaft it would run but not well...

Depends on which 14 bolt we are talking about, working on and what it came out of. Theres a 14Bolt 9.5" SF, 14 bolt 10.5" FF early, Mid and late design, 14 bolt FF AAM 11.5 and 14 bolt FF AAM 11.8. Main differences is housing or center section offset and pinion position being either high or...