4L30E Banner Rebuild Kit 1989-2002, new and ready to install. Fits the 4L30E. Ships fast from the USA.
A 1997-2001 Cadillac Catera, an Opel or Vauxhall Omega, or an early BMW six-cylinder automatic that slips into third, picks up reverse late, or flares between gears once it is hot is a 4L30E that needs its soft parts renewed. This 1989-2002 banner rebuild kit pairs a full transmission overhaul kit with a standard set of friction clutch plates. It is sold without overdrive pistons, which matters for the BMW fitment covered below.
The 4L30E is a GM four-speed built in Strasbourg, France, for longitudinal rear-drive cars. Power flows through an overdrive section at the front and a main case with the second, third (direct) and fourth clutches, a band and a reverse clutch. Each clutch is a stack of frictions and steels squeezed by a piston, and every piston, case joint and valve body plate is sealed by a part in the overhaul kit. When frictions glaze or a piston seal leaks, that clutch slips, and the heat it makes spreads to the rest of the unit. Replacing frictions and seals together brings the holding power back up across all the packs at once.
Start with the fluid level and condition, then read codes. On the Catera, Transmission Digest notes the case connectors were laid out the opposite way from the early Isuzu units, and brittle connector legs let the internal harness plug in wrong, setting codes for the pressure control solenoid, TCC solenoid or temperature sensor. Rule that out, then run the line pressure and stall checks in our transmission slipping diagnosis guide. If the case is cracked or the drums are scored, weigh the job using our rebuild vs replace vs reman comparison first.
The listing names the 1997-2001 Cadillac Catera, 1989-2002 Opel and Vauxhall Omega, and 1989-1994 BMW, with BMW limited to units that use the molded overdrive piston. Wikipedia lists the Catera from 1997-2001 and the Omega B from 1995-2001. The big variation inside this range is the 1998 direct clutch change: Transmission Digest reports GM added more, thinner direct clutch frictions, about 0.063 in, along with a dished direct drum, piston and pressure plate, and a second clutch drum with a lowered snap-ring groove. Early and late parts only interchange in one direction, so count the direct frictions you remove and compare them to the kit before assembly. Read the ID tag and send us your year and VIN to confirm. Other 4L30E kits are on our rebuild kits page.
| Fits | 4L30E 1989-2002 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Yes, the listing covers the 1997-2001 Catera. Send us your VIN so we can confirm against the 1998 direct clutch change before it ships.
Only 1989-1994 BMW units with the molded overdrive piston, per the listing. Later BMW 4L30E units should use a different kit, so check the tag first.
No. It is an overhaul gasket and seal kit plus frictions. Overdrive pistons, steels, the band and the filter are separate.
Worn reverse clutch seals and frictions are common, but a leaking TCC solenoid or a misplugged internal harness can cause it too. Check those before tearing down.
GM's 4L30E specification calls for Dexron III. Follow the fluid named in your owner's manual if the vehicle maker specifies a different one.
