Modern drivetrain systems rely on electronics, control modules, and precise calibration to keep vehicles operating smoothly. International Fleet Services provides expert transmission repair, drivetrain diagnostics, and differential service for fleets across West Hartford and Greater Connecticut, ensuring every truck performs safely and reliably.

We also specialize in complete diesel engine repair, rebuilds, and replacements. Whether your truck is experiencing performance issues, overheating, or major drivability problems, our experienced team can diagnose the issue and recommend the best solution—cylinder head replacement, in-chassis engine rebuilds, or full engine replacement.