4L30E Clutch Drum 1989, new and ready to install. Fits the 4L30E. Ships fast from the USA.
This is a GM 4L30-E 3rd clutch drum, catalog reference U24555E (interchange 24555), listed for 1989-on units. It is the drum you need when a BMW 318i, 325i, 328i or 525i, an Isuzu Rodeo, Trooper or Amigo, a Honda Passport, Acura SLX or Cadillac Catera slips in 3rd and 4th, flares on the 2-3 shift, or comes apart on the bench with a cracked drum or a burnt 3rd clutch pack. It ships from the USA with a 1-year warranty.
The 4L30-E is a three-speed main gear train, descended from the TH180/3L30, with an overdrive section added at the front in the adapter case. GM's own cutaway lists a separate 2nd, 3rd, reverse and overrun clutch, a sprag-type main freewheel and a roller-type overdrive freewheel. The 3rd clutch locks the main gear train for its 1:1 third gear. Fourth gear is that same 1:1 main-box state with the overdrive section added, which is why 3rd is 1.000 and 4th is 0.723 in every 4L30-E. The practical result: a leaking 3rd clutch drum hurts both 3rd and 4th, and it is felt as a flare on the 2-3 shift and slip under load at highway speed.
Reverse problems are the most common 4L30-E complaint, and Transmission Digest traces many of them to the reverse piston, a leaking TCC solenoid feeding the reverse lockout circuit, and mismatched adapter case and center support parts. Rule those out before you blame a drum for a no-reverse.
Check fluid level and condition first, then note exactly which shifts flare. A line pressure test, covered in our line pressure guide, separates a low-pressure problem from a clutch that is leaking on its own. Our slipping diagnosis guide lays out the road test. With the unit apart, air-check the 3rd clutch piston, inspect the drum lugs and snap ring groove, and measure the bushing.
The drum is catalogued as fitting 4L30-E units from 1989 on, which covers the production run in the BMW E34, E36, E39 and Z3, Isuzu Rodeo, Trooper, Amigo, Axiom and VehiCROSS, Honda Passport, Acura SLX, Opel Omega and Frontera, and Cadillac Catera. The 4L30-E came in two ratio sets (Type A in BMW and Opel cars, Type B in the Isuzu trucks), and Transmission Digest warns that some adapter case and center support parts do not interchange between manufacturers. Compare your old drum against this one (lug count, hub, bushing and overall height) or send us your year, model and VIN and we will confirm fit before it ships. More 4L30-E parts start at the 4L30E master rebuild kit.
| Fits | 4L30E 1989 |
| Part type | Clutch Drum |
| Condition | New |
| Brand | GM |
| Reference | U24555E |
| Ships | From the USA |
| Warranty | 1-year |
It is the 3rd clutch drum, reference U24555E with interchange number 24555. It is not the low band drum or the reverse clutch housing.
In the 4L30-E, 4th gear is the main gear train held in its 1:1 third-gear state with the front overdrive section added. If the 3rd clutch slips, both gears slip.
It is catalogued for 1989-on 4L30-E units, but some 4L30-E parts differ by manufacturer. Match your old drum side by side or send us your VIN so we can confirm before shipping.
Replace the 3rd clutch frictions, steels, piston seals and sealing rings, check the bushing, and finish with a new filter, pan gasket and fresh fluid.
GM specifies Dexron III type ATF for the 4L30-E, with a dry capacity of about 7 quarts. Check the level hot after the rebuild.
