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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28663" data-attributes="member: 13218">Nearly all converters that have a higher stall speed are 'looser', but NOT all of them.Let's say that you're parallel parking a 220" Suburban in a 232" parking space between two other vehicles with both their drivers dozing off inside.The looser the converter is, the harder it'll be to successfully get it in there and let both of them sleep.Even with perfect throttle mgmt, a looser converter will let RpMs climb higher before the vehicle moves (making louder noises of higher pitch).To oversimplify:A looser converter wastes more fuel whenever the RpMs are under the converter's stall speed.A tighter converter acts more like an already engaged physical / dry clutch plate, which is more fuel efficient. HOWEVERStall speed is independent of how loose or tight a converter is.The converter's internal construction, including its size, can be spec'd and arranged in such a way that maintains GM OE gentle throttle responseANDhave a higher stall speed than GM OE ... but this always costs more because of the specialized construction.3.73 (or 4.10) will yield more smiles per gallon than a looser converter, lose very little if any highway MpG, and enhance your 4L60E's longevity/durability.They're not just for improving tow / haul ratings.</blockquote>