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).
Drums and shells (1997-1998): Center-lube redesign: new center support, second-design sun gear shaft (shortened bushing journal, used only 1997-98), other internal hard parts redesigned.
Clutches (1996-1998): Same counts (RGPZ-010 '96-on: 3 overrun, 4 fourth, 4 intermediate, 10 forward/direct)
Band (1996-1998): Low/Reverse servo redesigned (Sonnax '96-later piston 34914-02 and spacer kit 34528-01K).
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).

Build the 1998 4L80E kit 1997 4L80E parts list 1999 4L80E parts list Every 4L80E year

FAQ

What parts are year-specific on a 1998 4L80E?

On a 1998 4L80E these parts are year-specific: valve body, internal harness, pump, drums and shells, clutches, band, case, switches and sensors. Every part listed above is confirmed for 1998, so you can order from this list with confidence.

Can I order only some of the 1998 4L80E parts?

Yes. The 1998 4L80E kit builder lets you tick only the parts you need, and they go into one cart.

1998 4L80E Rebuild Parts List: Every Part That Fits

Rebuild and Overhaul Kits

Valve Body

Solenoids

Bands

Sprags and Roller Clutches

Shift Kits

Filter, Pan and Pan Gaskets

What changed for 1998

FAQ

What parts are year-specific on a 1998 4L80E?

Can I order only some of the 1998 4L80E parts?

Sources