9.1 Axle Codes

Axle codes are never located on the axle housings themselves. In trucks manufacturered after 1976, the axle codes are located on the build plate which can be found inside the engine compartment. The pinion (and sometimes the ring gear have the tooth counts (from which the ratio can be calculated) stamped into them.

For the 80 Series, the number of teeth on the ring and pinion were increased. While the earlier heavy-duty 4.11:1 gears had 37 teeth on the ring gear and 9 on the pinion, from 1990 on, the gears were actually 4.10:1 with 41 ring gear teeth and 10 pinion teeth.

Code Example:

First digit: ring gear size

Second, third digits: ring/pinion gear ratio

(These numbers apply to ALL Toyota vehicles--known Land Cruiser ratios are indicated)

Fourth digit: number of spider gears, limited slip/locker

030223