| A popular solution is to spread the gear sets over three, instead of the usual two, countershafts, trading length for width. |
| The third and fourth countershafts have gears rotatably engaged with the fourth forward mainshaft gear and an output shaft splitter gear. |
| The primary drive is by a pair of duplex chains driving a pair of countershafts to the drive wheels at a ratio of about 20-1, via a pair of Go-cart chains. |
| Also, the countershafts of the Direct 10 turn slower than typical overdrives, for reduced lube churning losses and operating temperatures. |
