RENK America is keeping its Muskegon plant firmly in the Army's drivetrain, locking in roughly $691 million to keep cranking out HMPT 800 hydromechanical transmissions for tracked vehicles. The five-year, firm-fixed-price deal covers new-build, remanufactured and upgraded units plus ancillary hardware for medium-weight armored platforms, a renewal that underscores how one production line can influence readiness across brigade combat team fleets.
According to the Pentagon's contracts notice, Army Contracting Command - Detroit Arsenal awarded RENK America LLC a $691,258,891 firm-fixed-price contract (W912CH-26-D-0056) to produce HMPT transmissions, with an estimated completion date of Dec. 31, 2030. The listing on PublicNow spells out the award amount, contract type and contracting office and shows the action as posted in mid-June 2026.
What the HMPT 800 Does
RENK describes the HMPT 800 as a compact, continuously variable hydro-mechanical transmission rated at roughly 597 kW (800 hp) and intended for vehicles up to about 45 metric tons, a profile that lines up with the Army's medium tracked platforms. As detailed on RENK, the HMPT 800 keeps common interfaces with earlier HMPT variants, which simplifies integration and sustainment across the existing fleet.
Muskegon Capacity and Production Milestones
The new award feeds work at RENK America's Muskegon operations, where the company reports a sizable U.S. production footprint and a workforce numbering in the hundreds. In October 2025, the company marked the build of its 4,000th HMPT 800 and highlighted that milestone as part of broader recognition from the American Gear Manufacturers Association, crediting teams in Cincinnati, Muskegon and across the RENK Group. The milestone was highlighted in a company release on RENK, which pointed to the plant's role in sustaining the Army's medium tracked fleet.
Where Those Transmissions Go
The HMPT 800 supplies drivetrain power for vehicles such as BAE Systems' Armored Multi-Purpose Vehicle and upgraded Bradley configurations, linking engines to final drives and steering systems that must withstand combat-level abuse. BAE and defense reporting describe the AMPV as Bradley-derived and note its pairing with the HMPT powertrain, BAE Systems provides additional platform context in its data sheet.
At the same time, the XM-30 program to replace the Bradley moved through Milestone B in June 2025, but remains years away from operational fielding. That gap helps explain why the Army is leaning on sustainment buys like the latest HMPT 800 contract to carry existing formations while next-generation designs mature. Program timelines and near-term plans are laid out in EveryCRSReport materials that track XM-30's schedule and status.
What Comes Next for Supply and Sustainment
Public procurement records for the THOR IV production award show the Army using a sole-source justification for RENK, a reminder of how specialized heavy tracked-vehicle transmissions are and how few domestic suppliers can actually build them. Listings on GovDash and related industry coverage outline the award vehicle and contracting authority, while other outlets describe the latest action as the fourth multi-year transmission award to the company. Reporting from Defence Blog has emphasized how the deal helps preserve U.S. industrial capacity even as the Army pushes forward on vehicle modernization programs.
For Muskegon and for the Army's maintenance ecosystem, the contract effectively secures a production runway for a key drivetrain component and buys time for new platforms to come online. The public contracting record and company releases document the award, while industry reporting focuses on the longer-term implications for the armored-vehicle industrial base.
