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Message: <blockquote data-quote="stutaeng" data-source="post: 25837" data-attributes="member: 6175">The "LS" bellhousing bolt patterns are all the same. A 4L80e will bolt up to a 4.8 or 5.3 as well. GM used a spacer on the LS engines flexplate to account for the shorter crank vs the SBC/BBC. The only exception was that first year 6.0 LS with the "long crank" (was also the first and only year of the cast iron heads). On that one, you can only mate it to a 4L80e, not a 4L60e, unless you get a special unique torque converter designed for it.This thread discusses that in detail: <a href="https://ls1tech.com/forums/automatic-transmission/1777893-all-about-flexplates-converters-transmissions-spacers.html" target="_blank">https://ls1tech.com/forums/automatic-transmission/1777893-all-about-flexplates-converters-transmissions-spacers.html</a></blockquote>