
X1100
Transmission family; do not assume a common configuration across every Abrams variant.
Link Confirmed
Ground vehicle · Land
Army ground combat vehicle family included in GAO’s 2025 sustainment review. Its cited fleet maintenance trend compares fiscal 2015 with fiscal 2023 and is not a purchase price or variant-level cost.
Army ground combat vehicle family included in GAO’s 2025 sustainment review. Its cited fleet maintenance trend compares fiscal 2015 with fiscal 2023 and is not a purchase price or variant-level cost.
GAO reports Abrams maintenance costs rising
GAO reports a $181.3 million fleet-wide maintenance cost increase between FY2015 and FY2023, with per-vehicle maintenance costs nearly doubling. Availability was below the Army goal. The public summary does not provide an Abrams-specific readiness percentage or the dollar basis for this comparison; neither is inferred.
Solid entries are confirmed, outlined reported, dashed estimated or still to come; dotted italic entries are speculative. Dates show only the precision the sources give.

Transmission family; do not assume a common configuration across every Abrams variant.
Link Confirmed
Sam Eckholm · May 16, 2026 · Supports: System · name
“M1 Abrams”
U.S. Government Accountability Office · Sep 25, 2025 · Supports: System, System milestone
“the Abrams experienced a fleet-wide increase in maintenance costs of $181.3 million and per-vehicle maintenance costs nearly doubled.”
Supports: System · system component:allison-x1100
“Allison began production of the X1100™ cross-drive transmission in 1979 for use in the U.S. Army’s M1 main battle tank.”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.