The Peterbilt 389 is one of the most iconic and successful premium long-hood conventional Class 8 trucks ever produced. The Peterbilt 389 is the favorite of owner-operators and small-fleet operators who want classic Peterbilt styling combined with modern Class 8 powertrain technology. Regarding the transmission, the Peterbilt 389 was traditionally specified with manual transmissions (Eaton Fuller 13 and 18-speed Roadranger manuals), but the modern Peterbilt 389 is increasingly ordered with automated manual transmissions (AMTs) or fully automatic transmissions for improved driver comfort, fuel economy, and reduced driver training requirements.
Depending on the Peterbilt 389 build specification, automatic transmission options include the Eaton Fuller UltraShift PLUS automated manual transmission, the PACCAR TX-12 AMT (PACCAR Powertrain's own 12-speed AMT), or the Allison 4000 / 4500 / 4700 series fully automatic transmission. These transmissions are designed to offer smooth and accurate gear shifting, fuel economy optimization, and ease of operation for long-distance highway service or heavy-duty vocational duty.
Our collection features used Peterbilt 389 automatic transmissions for sale from reputable dealers and private sellers across the USA, including donor trucks from major trucking states like Texas, California, Colorado, and Florida. If you're looking for a reliable pre-owned Class 8 transmission, our inventory caters to all variants (Eaton UltraShift PLUS, PACCAR TX-12, Allison 4000 series) and price points.
| Option | Description |
|---|---|
| Eaton Fuller UltraShift PLUS | The dominant Peterbilt 389 AMT choice. Available in 10-speed (UltraShift PLUS LSE), 13-speed (UltraShift PLUS XX), and 18-speed (UltraShift PLUS VAS) configurations. 1,650 to 2,250 lb-ft torque capacity. Computer-actuated clutch and shifting; automated manual architecture (no torque converter). Excellent fuel economy at highway cruise. |
| PACCAR TX-12 | PACCAR Powertrain's own 12-speed AMT, jointly developed with Eaton. Increasingly popular in current Peterbilt 389 production (and Kenworth T680, since both are PACCAR brands). Up to 1,850 lb-ft torque capacity. Integrated with PACCAR engine ECM for optimized shift timing. |
| Allison 4000 / 4500 / 4700 series | Fully automatic transmission with torque converter, used primarily on vocational Peterbilt 389 configurations (dump trucks, heavy-haul, refuse, fire apparatus on commercial Peterbilt 389 chassis). 6 forward speeds. 1,150 to 2,050 lb-ft torque capacity. Smooth low-speed maneuvering and stop-and-go performance. |
Tell us your specific Peterbilt 389 build and we'll match the correct transmission variant.
Opting for an automatic or AMT transmission in your Peterbilt 389 enhances your driving experience by offering:
1. Peterbilt 389 (the iconic premium long-hood conventional Class 8 tractor; this listing's primary application)
4. Caterpillar C15 (legacy CAT power, available on older Peterbilt 389 production before CAT exited on-highway in 2010)
Experience excellence on the road with the Peterbilt 389 automatic transmission. Designed for durability, comfort, and efficiency, our selection offers something for every owner-operator and fleet manager. Browse our listings, call to confirm variant and donor details, and order with confidence.
| Item | Details |
|---|---|
| INCLUDED | Complete AMT or Allison transmission case with internal gears (or planetary gearsets in Allison), clutch (AMT), torque converter (Allison), shift actuators (AMT), valve body (Allison), output shaft. AMT control module typically included from donor. |
| NOT INCLUDED | Transmission cooler (chassis-mounted, sold separately), driveshaft, transmission crossmember, shift selector and wiring (sold separately depending on configuration), ECM (engine ECM and transmission control module may be separate), fluids (drained for transit). |
| Fluids | Drained before shipping. Refill with proper Eaton (for UltraShift PLUS, PACCAR TX-12) or Allison (for 4000 series) specification fluid per application. |
| Provenance Note | Donor Peterbilt 389 disclosed. AMT or automatic variant authenticated. Mileage documented where verifiable. |
| Core Note | No core charge. You are not required to return your old transmission. |
The Peterbilt 389 automatic transmission fits:
| Vehicle | Compatibility |
|---|---|
| Peterbilt 389 | Premium long-hood conventional Class 8 tractor (primary application) |
| Long-Haul Tractors | Sleeper-cab Peterbilt 389 configurations |
| Tanker Trucks | Peterbilt 389 with tank trailer service |
| Dump Trucks | Vocational Peterbilt 389 (typically Allison automatic) |
| Heavy-Haul | Oversize / heavy-haul Peterbilt 389 |
| Fire Apparatus | Commercial Peterbilt 389 chassis fire apparatus |
| Cross-Application | PACCAR TX-12 also fits Kenworth T680, T880, W990 (both Peterbilt and Kenworth are PACCAR brands); Eaton UltraShift PLUS fits any Class 8 chassis specified for it |
Tell us your specific Peterbilt 389 build and we'll match the correct transmission variant.
Every used Peterbilt 389 automatic transmission we ship goes through this process:
| Fluid Capacity | 40 to 50 Quarts |
|---|---|
| Gear Ratios | 1st Gear: 7.17 or 6.31 | 2nd Gear: 4.89 to 5.04 | 3rd Gear: 3.30 to 3.50 | 4th Gear: 2.10 to 2.50 | 5th Gear (Overdrive): 0.73 to 0.80 |
| Overall Length | 240 to 310 inches (per spec sheet) |
| Torque Rating | 1 | 050 lb-ft | 250 lb-ft to 2 |
| Weight | 600 to 900 lbs |
| Type | Automatic Transmission |
| Speeds | 4 forward gears (per spec sheet); actual Peterbilt 389 AMT options are 10 / 12 / 13 / 18 speed |
| Variants | Eaton Fuller UltraShift PLUS (AMT) | PACCAR TX-12 (AMT) | Allison 4000 / 4500 / 4700 series (fully automatic) |
| Vehicle Application | Peterbilt 389 long-hood conventional Class 8 tractor |
| Engine Compatibility | Cummins ISX15 / X15 | PACCAR MX-13 | Detroit DD13 / DD15 | Caterpillar C15 (legacy) | Cummins ISX12 |
| Compatibility | 2007 Peterbilt 389 Automatic Transmission |
| Price | 499.00 | $2 |
Every used Peterbilt 389 automatic transmission sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To file a claim, contact us within 15 days of delivery at (240) 301-0095 or support@vazautosolutions.com.
