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Re: 4L80E behind a 5.3
If you were to dyno the same vehicle with a 60e vs an 80e, the 60e would have a little less parasitic drivetrain loss; the tradeoff being that the 80e is far stronger, enough to warrant a little extra loss.
When you start making big power, that few hp loss is worth the strength. The same applies to rear ends as well (i.e 10bolt vs 12bolt)
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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