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Keith Seymore · 10-11-2018, 09:45 PM

It’s a top speed/shaft rpm thing.

It affected by engine, trans, rear axle ratio and tire size. If the combination of those factors causes a one piece shaft to exceed its critical speed then a two speed shaft is released.

K

10-11-2018, 09:45 PM	#4
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,167	Re: Driveshaft Question It’s a top speed/shaft rpm thing. It affected by engine, trans, rear axle ratio and tire size. If the combination of those factors causes a one piece shaft to exceed its critical speed then a two speed shaft is released. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/