The 8400R is exclusively fitted with the e23 full power shift transmission , offering 23 forward and 11 reverse speeds. This mechanical gearbox is noted for being perfectly suited to heavy cultivation.

Tractor Test 2172: John Deere 8400R e23 - DigitalCommons@UNL

For a deep dive into the official performance data, you can view the Nebraska Tractor Test 2172, which provides the technical verification for its record-breaking drawbar performance.

An optional dual-pump system provides a massive flow rate of up to 321 L/min (85 gpm), essential for high-demand modern implements. Potential Limitations

A comprehensive look at the can be found in the Farmers Weekly review , which evaluates its performance as the most powerful standard tractor ever made at the Waterloo factory. Key Performance Highlights

Despite its size, the tractor is surprisingly agile in smaller fields, aided by ActiveCommand Steering (ACS) which allows for quick headland turns with only 3.5 turns lock-to-lock. Field Capabilities

It features a 9.0L PowerTech PSS engine delivering a rated 400 hp , capable of boosting up to 450 hp with Intelligent Power Management (IPM). It sets high standards for power efficiency, with independent tests showing it transmits roughly 91% of its power directly to the drawbar.

The model is approved for Group 49 rear tires , which provide a larger footprint and better traction to handle its high horsepower without excessive soil compaction.