4T65E Input Drum 2003, remanufactured and ready to install. Fits the 4T65E. Ships fast from the USA.
A 2003 or newer Impala, Monte Carlo, LeSabre, Lucerne or Grand Prix that sits in Drive for a second before it grabs, or flares between 2nd and 3rd once the fluid is hot, very often has an input housing problem. This is a remanufactured 4T65E input drum for 2003-and-later transaxles, sent out as a complete assembly: the housing has been cleaned, inspected and tested, then built with new clutch frictions, a new piston and a new bushing and seal, with the original steels inspected and reused. It drops into a rebuild already assembled, so you are not sourcing frictions, pistons and bushings separately for the hardest pack in the unit.
The input shaft and housing assembly holds the input clutch and the 3rd clutch. Oil for both packs is fed through three solid Teflon rings on the housing that seal against the driven sprocket support, so any loss of seal there hits two clutches at once. At the start of 2003 production GM replaced the earlier serviceable input and third sprags with pawl-clutch assemblies that cannot be taken apart. The input pawl uses a 30-spline outer race and 30-tooth input frictions, where the older sprag design used 32. That change is the reason this drum is listed separately from the 1997 to early-2003 version.
Rule out the cheap causes first: low or burnt fluid, and a sticking pressure control solenoid, which TransGo calls the most common cause of P1811 on this unit. Our 4T65E pressure control solenoid guide shows how to separate the two. If the complaint is a hot delay with a 2-3 flare, read the delayed engagement guide. ATSG documented 4T65E units at fleet mileage where the driven sprocket support, not the drum, was what the rings could not seal against, and a new drum alone would not have fixed it.
This drum is for 4T65E transaxles built from the 2003 model year onward, the pawl-clutch design, through the end of production in 2011. Confirm before you buy by checking the ID tag and counting the teeth on an old input friction: 30 teeth matches this drum. If yours has 32 teeth, you have the earlier dual-sprag unit and should look at our 1997 to early-2003 input drum with overhaul kit. Transmission Digest notes the pawl parts must be used as a set and not mixed with sprag-design pieces. When in doubt, send us your year, model and VIN, or see every part we carry on the 4T65E parts page.
| Fits | 4T65E 2003 |
| Part type | Input Drum |
| Condition | Remanufactured |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It is a remanufactured assembly with new clutch frictions, a new piston, and a new bushing and seal installed. The original steels were inspected and reused. The housing was cleaned, inspected and tested before assembly.
No. Units built before the 2003 model year use the dual-sprag input design with 32-tooth input frictions. This drum is the 2003-up pawl design with 30-tooth frictions, and the two must not be mixed.
Replace the three Teflon sealing rings and check the driven sprocket support for a worn or stepped bushing. Most rebuilders also install an overhaul gasket and seal kit, and a valve body if the old one has worn bores.
A slipping input or 3rd clutch can set P0730 for an incorrect gear ratio, and long shifts can set P1811. A sticking pressure control solenoid causes the same codes, so test it first.
DEXRON-VI. On a 2008 Impala, GM lists a 7.4 quart capacity and wants the level checked at 180 to 200 degrees F.
