4L30E Banner Rebuild Kit 1998, new and ready to install. Fits the 4L30E. Ships fast from the USA.
If you are rebuilding a late 4L30E out of a 1998-1999 BMW 318i, 323i, 328i or 528i, a Z3, a Cadillac Catera, or a late Isuzu Rodeo, Trooper or Honda Passport, and it slips into third, flares on the 2-3 shift or barely moves in reverse, this banner kit is built for the later version of the transmission. It is listed for 1998-up units and packs a Toledo Trans-Kit overhaul set, a friction pack that uses the late-model third clutch plates, and a new filter in one box, so you are not hunting for the filter separately.
GM built the 4L30E in Strasbourg as a light rear-drive four-speed with a 350 Nm torque limit. Wikipedia lists two ratio sets: Type A for BMW and Opel (2.40 first, 1.47 second) and Type B for the Isuzu Trooper and Rodeo (2.86 first, 1.62 second); both share a 1.00 third and 0.723 overdrive. The ratios differ, but the clutch packs, seals and gaskets are what wear. Third gear comes from the third clutch, and on late units that pack uses a different friction than the early transmissions, which is why a 1998-up kit is sold separately from the 1990-1997 version. The overhaul set reseals every piston, the pump, the servo and the joints between the adapter case and the main case, and the friction pack replaces the lined plates in each clutch.
Read the pan first. A pan with clean fluid points away from worn frictions, and in that case a pressure control solenoid or the valve body is the cheaper suspect. Transmission Digest found that reverse complaints on this unit often come from the reverse piston's inner seal: the seal surface wears smooth, the seal leaks, and the reverse clutch slips. An air check through the case will show that leak. Our transmission slipping diagnosis guide lays out the pressure and stall checks to run in order, and if the case or drums are damaged too, read the rebuild vs replace vs reman comparison before buying parts.
This kit is listed for 1998-up 4L30E transmissions and the listing names BMW and Cadillac. From 1998 on, Wikipedia places the 4L30E in the BMW 318i (through 1998), 323i and 328i (through 1999), 528i (through 1999) and Z3 (through 2000), the 1997-2001 Cadillac Catera, the 1994-2001 Honda Passport, the 1998-2000 Isuzu Amigo, the Rodeo through 2003 and the Trooper through 2002. The Isuzu and Honda units share the internals but use their own adapter case and may take a different filter, so check the case and filter against yours before ordering. Transmission Digest also notes that 2000-up Trooper and BMW units moved to a PWM converter clutch with a new pump. That change does not alter the clutch packs, but it is one more reason to give us your year and VIN. Earlier units use the 1990-1997 4L30E banner kit, and the full range of kits is on the rebuild kits page.
| Fits | 4L30E 1998 |
| Part type | Banner Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Yes. The listing for the 1998-up kit includes the overhaul gasket and seal set, a friction pack with the late-model third clutch plates, and a filter.
This kit is listed for 1998-up units. For a 1996 or 1997 car, use the 1990-1997 4L30E banner kit, or send us the year and VIN and we will confirm which third clutch frictions your unit uses.
The 4L30E in Isuzu, Honda and Acura trucks shares the clutch packs with the BMW and Cadillac units, but the adapter case is different and the filter may be different. Match your case and filter, or give us the VIN to check.
No. Steels are not listed in this banner kit. Measure the old ones and replace any that are blued, warped or worn.
Often the cause is the reverse piston's inner seal wearing its bore, which this kit reseals. Transmission Digest also found a leaking TCC solenoid can cause cold no-reverse, so test the solenoid before tearing down the unit.
GM's spec sheet lists Dexron III. Follow the fluid named in your owner's manual and check the level hot with the engine running.
