Interstate-McBee M-3800785 Piston Kit .040 (1.00 mm) – 98.5–02 5.9L Cummins Standard Output

Restore compression and reliability on your 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins (24-valve, Standard Output) with this OEM-style .040 in / 1.00 mm oversize piston kit from Interstate-McBee. Each kit is engineered for factory-match fit and durability on ISB 5.9 applications.

• Oversize for rebuilds: .040 in (1.00 mm) to match common machine shop overbores.
• Complete single-cylinder kit: Includes piston, ring set, wrist pin, and pin retainers (order qty 6 for a full engine).
• OEM-equivalent performance: Matches OE spec for form, fit, and function.
• Aftermarket value: Interstate-McBee quality at a lower cost than genuine OEM.

Specifications

Vehicle Fitment

Always verify by engine serial number (ESN) and build details.

• Dodge Ram 2500/3500 — 5.9L Cummins ISB 24-Valve (Standard Output)
  • Model Years: 1998.5, 1999, 2000, 2001, 2002
  • Note: For Standard Output engines. Not typically used on 2001.5–2002 HO (NV5600) applications.

Install Notes

• Confirm machine shop bore size; measure piston-to-wall clearance per Cummins service manual.
• Check ring end gap and orientation; verify piston protrusion and deck height.
• Lubricate wrist pin/bore; torque fasteners to spec and follow break-in procedures.

Cross-References & Related

• OE: Cummins 3800785 (ISB 5.9 piston kit, 1.00 mm over)
• Other sizes: Interstate-McBee M-3800781 (STD), M-3800784 (.020 / 0.50 mm)
• Ring sets (if purchased separately): M-3802423 (.040), M-3804990 (STD)

Why Buy From CPP Diesel

• Diesel experts with ESN-verified fitment support
• Fast shipping and hassle-free returns
• Huge in-stock selection of 2nd-Gen Cummins rebuild parts

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