Combines 9610 4WD Motor Size

i know that allthe new combines are coming out with the same new 4 wheeldrive axle out of the factory now with the exception of the new 9860's they have a bigger pump that feeds the wheels they all have a 2 speed axle as well don't know if this will help you but that is what i know

There was the ability to spec the large motors with the 4x4, but were part of the 28l option. You could go 18.4-26 w_ HD, but usually the 1600's went with the 18.4-30's and 28l's. Similar to the the 30.5's with bull gear finals and 35.5's with planetaries. You can get planets with 30.5's but not 35.5's w_ bulls.