Your model number supplied is not valid, but I don't think the gears have changed over the years

917-0299 ! GEAR-WORM-LH-DBL T $56.42

Go to Milaca.com and type in this model nr. below.

319-840-000 (1989)

Thanks baymee thats the # on the machine,but i made a mistake i need the gear not the worm. i went to that web site but could not find place to put model # .THANKS JIM

See if this link works:

http://www.milacalawn.com/pages/OemParts#/MTD/319-840-000_%281989%29/Parts/0262600-A/02626000003

917-1425 GEAR-WORM-LH DBL T $91.46