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2003 4L80E Rebuild Parts List: Every Part That Fits

Every part below is confirmed to fit a 2003 4L80E. Order the parts you need in one cart.

Build your 2003 4L80E kit

Rebuild and Overhaul Kits

Rebuild / overhaul kit: 4L80E Transmission Overhaul Gasket and Seal Kit (Regular, $76.99) or 4L80E Transmission Banner Kit with Raybestos Frictions (Alternate, $165.99)

Solenoids

Shift solenoids A and B: 4L80E/4L85E Shift Solenoid Kit A & B - 24230289 24230288 (Regular, $39.99)
Solenoid kit: 4L80E Transmission Solenoid Kit, EPC, Shift A/B and TCC (Regular, $113.99) or 4L80E 4-Piece Solenoid Kit EPC TCC Shift, 1991-2003 (Alternate, $120.99)

Bands

Band: 4L80E Rear Reverse Band, BorgWarner High Energy 38014BW (Upgrade, $79.99)

Sprags and Roller Clutches

Sprag / one-way clutch: 4L80E Intermediate Sprag Clutch, 34-Element Heavy Duty (Upgrade, $76.99)

Shift Kits

Shift kit: TransGo SK 4L80E Shift Kit, Reprogramming Kit for GM 4L80E/4L85E (1991-Up) (Upgrade, $116.99)

Filter, Pan and Pan Gaskets

Transmission pan: 4L80E Transmission Oil Pan with Drain Plug, OE 265-810 (Regular, $66.99) or 4L80E Transmission Oil Pan Kit with Filter and Gasket (Alternate, $74.99)
Filter and gasket kit: 4L80E Transmission Filter and Gasket Kit for GM 2500 and 3500 Trucks and Vans, Deep Pan (1999-2006) (Upgrade, $28.99)

What changed for 2003

Valve body (1997-2003): Second-generation VB for center-lube case: lube hole relocated, no two small holes on upper right.
Internal harness (1994-2003): Rostra 350-0032 / GM 24222798 internal harness (temp sensor in harness); fits 1994-2003 natively and 1991-1993 only if the external connector is updated.
Pump (1997-2003): Pump body redesigned (bridge in cooler passage, casting 24205779, wider bushing; retro-fits back to 1991, so the body is effectively '91-up).
Clutches (1999-2009): Intermediate backing plate becomes flat .275 in thick ('99-later); friction counts unchanged per Raybestos '96-on pack. 4L85E friction counts not separately confirmed.
Band (1999-2009): Wider 1.250 in front band with longer front servo apply pin; band and pin must match case year.
Case (1997-2003): Case type 2: return cooler line moved toward center of case into a center-support seal (center lube); front boss left unmachined and hole blocked.
Switches and sensors (1995-2009): External NSS / MLPS on selector shaft; long manual shaft (Sonnax 38511-04K '95-later).
Overhaul kits (1997-2003): Kits grouped 1997-up / 1997-2011 (34008EA 1997-Up, Precision 1997-2011 with or without molded pistons) because of center-lube case, bonded pistons and later filter.

Build the 2003 4L80E kit 2002 4L80E parts list 2004 4L80E parts list Every 4L80E year

FAQ

What parts are year-specific on a 2003 4L80E?

On a 2003 4L80E these parts are year-specific: valve body, internal harness, pump, clutches, band, case, switches and sensors, overhaul kits. Every part listed above is confirmed for 2003, so you can order from this list with confidence.

Can I order only some of the 2003 4L80E parts?

Yes. The 2003 4L80E kit builder lets you tick only the parts you need, and they go into one cart.