Transfer case with four-wheel underdrive operating mode

A transfer case for a four-wheel drive vehicle comprising, in combination,

• an input for receiving drive energy,
• a first output for driving a first drive line,
• a second output for driving a second drive line, said second output including first and second chain sprockets having disparate numbers of teeth and a chain engaging said chair sprockets,
• a planetary center differential having a carrier operably coupled to said input, a plurality of planet gears rotatably disposed in said carrier, a ring gear engaging said planet gears and operably coupled to said first output and an output sleeve having teeth engaging said planet gears, and
• a clutch collar rotationally coupled to said output sleeve and translatable no a first position operably engaging said ring gear and a second position operably engaging said second output.

A transfer case for a four-wheel drive vehicle comprising, in combination,

• an input,
• a first output for driving a first drive line,
• a second output for driving a second drive line, said second output including a speed reducing assembly, said speed reducing assembly includes a first chain sprocket having a first number of teeth and a second chain sprocket having a second number of teeth greater than said first number of teeth,
• a planetary differential having a carrier driven by said input, a plurality of planet gears rotatably disposed in said carrier, a ring gear engaging by said planet gears and driving said first output and an output sleeve having teeth engaging said planet gears, and
• a clutch member driven by said output sleeve and translatable to a first position operably engaging said ring gear and a second position operably engaging said second output, whereby said first position of said clutch member provides direct, two-wheel drive and said second position of said clutch member provides four-wheel drive underdrive.