pugwash Posted August 13, 2006 Share Posted August 13, 2006 So a portal axle will sginificantly reduce the stress across the axle when accelerating, but, if you are going down a hill and using engine breaking, is the portal axle multiplying torque "up" the drivetrain. e.g. You are descending a hill and need 300 ft/lb to maintain your current speed. A normal axle is revolving the propshaft at 30 rpm. Now a portal will have dropped that gearing, so 300 ft/lb will be pushing an a prop shaft at say 20 rpm. Now by my calculations that means the lower turning prop shaft will be under more torque. For an auto box this would be a bad thing yes? so what i have got wrong with this thinking? or am i right- and in reality it's not a problem? Quote Link to comment Share on other sites More sharing options...
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