# Twin Power 86-99 Big Twin Exc 99 FLHT Transmission Top Cover Gasket Replaces H-D 34904-86B 5 Pk

Twin Power™ transmission top cover gaskets seal the top cover to the transmission case on late 4-speed and 5-speed Big Twin models, helping prevent oil seepage during service.

-   Model specific coverage for 1986-2006 Big Twin applications, with noted FLHT and 2006 Dyna exclusions
-   Direct fit replacements for Harley-Davidson 34904-86B and 34904-86C
-   Convenient 5-packs for multiple services
-   Made in USA

This Part Fits:

Year

Make

Model

Submodel

1994-1999

Harley-Davidson

FLHR Road King

Base

1998-1999

Harley-Davidson

FLHRCI Road King Classic

Base

1996-1997

Harley-Davidson

FLHRI Road King

Base

1987-1993

Harley-Davidson

FLHS Electra Glide Sport

Base

1986-1999

Harley-Davidson

FLHT Electra Glide Standard

Base

1986-1999

Harley-Davidson

FLHTC Electra Glide Classic

Base

1996-1999

Harley-Davidson

FLHTCI Electra Glide Classic

Base

1989-1997

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

1995-1999

Harley-Davidson

FLHTCUI Electra Glide Ultra Classic

Base

1986-1990

Harley-Davidson

FLST Heritage Softail

Base

1988-1999

Harley-Davidson

FLSTC Heritage Softail Classic

Base

1990-1999

Harley-Davidson

FLSTF Fat Boy

Base

1993

Harley-Davidson

FLSTN Heritage Softail Nostalgia

Base

1994-1996

Harley-Davidson

FLSTN Heritage Softail Special

Base

1997-1999

Harley-Davidson

FLSTS Heritage Springer

Base

1996

Harley-Davidson

FLTCUI Tour Glide Ultra Classic

Base

1998-1999

Harley-Davidson

FLTR Road Glide

Base

1998-1999

Harley-Davidson

FLTRI Road Glide

Base

1986-1999

Harley-Davidson

FXST Softail Standard

Base

1999

Harley-Davidson

FXSTB Night Train

Base

1986-1999

Harley-Davidson

FXSTC Softail Custom

Base

1988-1999

Harley-Davidson

FXSTS Springer Softail

Base

1995-1997

Harley-Davidson

FXSTSB Bad Boy

Base

## Details

- **Price:** 48.18 CAD
- **Vendor:** TwinPower
- **Type:** Gasket Kits

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 48.18 CAD | In stock |

## Images

- Photo - Primary

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/twin-power-86-99-big-twin-exc-99-flht-transmission-top-cover-gasket-replaces-h-d-34904-86b-5-pk)
> Updated: 2026-07-14