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Truck Engine Work & Repair Services

Engine Diagnostics

  • Full computerized diagnostics

  • Check engine light inspections

  • Fuel system and sensor analysis

  • Compression and leak-down testing

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 Engine Repair & Replacement

  • Head gasket replacement

  • Timing chain/belt services

  • Valve and cylinder head repairs

  • Cracked block repairs

  • Turbocharger service and replacement

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 Complete Engine Rebuilds

  • In-frame and out-of-frame rebuilds

  • OEM & performance parts available

  • Diesel and gas engine rebuilds

  • Custom rebuild packages for fleet needs

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 Performance Upgrades

  • Tuning and ECU remapping

  • Turbo upgrades

  • Cold air intake & exhaust mods

  • EGR/DPF delete (where legal)

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 Maintenance & Support

  • Oil changes (conventional & synthetic)

  • Coolant system flushes

  • Fuel filter replacement

  • Scheduled maintenance programs

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Brands We Work With:
Cummins, Duramax, Powerstroke, Detroit Diesel, Caterpillar, Paccar, and more.

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Fleet Services Available – Ask us about discounts for commercial accounts.

Get a Quote

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Our Services

  • Tires

  • Full suspension

  • Oil changes

  • Engine work

  • Computer diagnostics

  • Parameter adjustments

  • AC repair

  • DPF and auto treatment repair

Opening Hours

Mon - Fri: 8am - 8pm
Sat: 9am - 3pm

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Contact Us

1625 S Larkin Ave,
Joliet, IL 60436

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Tel: 815-242-4664
info@forrestllc.net

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© 2025 by FORREST.

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