4L30E Banner Rebuild Kit, new and ready to install. Fits the 4L30E. Ships fast from the USA.
Rebuilding a 4L30E out of a BMW 3 or 5 Series, Z3, Isuzu Rodeo or Trooper, Honda Passport or Cadillac Catera because it slips into third, flares between gears or has lost reverse? This banner kit puts the soft parts for the whole job in one Toledo Trans-Kit box: the paper and rubber overhaul set plus every friction plate the unit needs. Steel plates are not included, which keeps the price down when your steels are still flat and clean.
The 4L30E is a light four-speed that GM built in Strasbourg, with the overdrive in a separate front adapter case bolted to the main case. Each forward and reverse range is applied by its own clutch pack, and every pack is sealed by lip or lathe-cut seals that harden with heat. When those seals leak, apply pressure drops and the frictions slip and glaze. This kit replaces the gaskets between the adapter case and the main case, the pan and pump gaskets, the piston seals and O-rings, and the lined friction plates. Friction brand can vary from box to box; the kit is packed with Exedy, Raybestos or Borg Warner frictions. You reuse your steel plates, so plan on measuring them before you commit.
Start with the pan. If the fluid is clean and the slip is only in second or third, Transmission Digest points to a torn case joint gasket between the overdrive and main cases as a common cause, which this kit does cover. If you have burnt frictions and scored steel plates, you need more than a banner kit; look at the 4L30E master rebuild kit, which adds steels. Electrical faults can mimic slips on this unit, so rule out the pressure control solenoid first. Our transmission slipping diagnosis guide walks through the checks in order.
This box is cataloged for the 4L30E without a year split. That matters: Transmission Digest documents a 1998 change to the direct clutch with more and thinner frictions and a revised drum and piston, so early and late units do not take the same friction count. The 4L30E was used in BMW cars from 1990 through about 2000, the 1997-2001 Catera, and Isuzu and Honda trucks through 2004, and the Isuzu-family cases differ from the BMW ones. Before ordering, give us the year, the VIN and if possible the transmission ID tag so we can confirm the frictions match. If your year is already known, compare the dated kits such as the 1998-up 4L30E banner kit and the full range in our rebuild kits category.
| Fits | 4L30E |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
No. It is the overhaul gasket and seal kit plus all friction plates. Steels are not included, so measure and inspect your old steels or step up to a master kit that has them.
It is cataloged for the 4L30E without a year split. Because the direct clutch changed in 1998, send us your year, VIN and transmission tag so we can confirm the friction set before it ships.
The internals are shared, but the Isuzu and Honda units use a different case and filter. Tell us the vehicle and we will check the kit against it.
The 4L30E was filled with a Dexron III type fluid, and the BMW dry fill with converter is about 7 quarts. Check your owner's manual or the fill plug tag for the exact type on your car.
Replace the filter and pan gasket, any worn steels, and the bushings. Check the pressure control solenoid and the valve body while the unit is apart.
