4T65E Input Drum 1995, used and ready to install. Fits the 4T65E. Ships fast from the USA.
This listing is filed with our 4T65E input drums, but the part itself is a different piece and we want you to know exactly what arrives. It is a used GM reaction sun gear and band drum assembly, the 14-roller late design, described for 4T60E and 4T65E transaxles from 1995 on. If your Impala, Grand Prix, LeSabre, Century, Monte Carlo or older Bonneville launches like it is in neutral, slips in first under throttle, or came apart with a chewed-up roller clutch or a burned forward band, this drum is one of the hard parts you will be holding in your hand when you find the cause.
The reaction sun gear drum sits at the back of the gear train. The reaction sun gear is part of the drum, the outside of the drum is the surface the forward band clamps against, and the inside of the drum rides on the 1-2 roller clutch. Between them, the band and the roller clutch hold the reaction sun gear so the planetary set can deliver its lower forward ratios. If the band surface is glazed or the roller clutch cannot lock, the car has no solid first or second gear even though the clutch packs above it are fine.
Transmission Digest documented a running change to this area on the 4T60E: starting with 1996 model production, GM moved the 1-2 roller clutch cam to an inside-diameter design and made the roller clutch outer race part of the reaction sun gear drum itself. That eliminated the separate inner race, snap ring and spacer, and fixed a roller clutch that could destroy itself freewheeling at high speed. The 14-roller drum in this listing is that later style. The 4T65E, which replaced the 4T60E for 1997, uses the same arrangement.
A slipping forward band is not always the drum's fault. Sonnax notes that a weak pressure control solenoid causes slip on takeoff and that a worn servo pin bore and excess band travel burn up new forward bands, so check line pressure and the EPC solenoid first. Our 4T65E delayed engagement guide walks through the Drive engagement checks, and the 4T65E common problems guide covers the pressure side. On the bench, hold the drum and turn the roller clutch: it should lock solid one way and turn freely the other. A drum with a blued band surface, a cracked sun gear tooth or a scored roller race should be replaced.
The listing describes this drum as a 4T60E and 4T65E part for 1995 and later, with 14 rollers. Because the redesign began with 1996 model production, look at your old parts before you install it. If your unit has a separate roller clutch inner race, a snap ring and a 1-2 support spacer, it is the early design, and Transmission Digest says the late parts must go in as a complete package with the matching support, bearing and ring gear. If your old drum already has the race built in, this is a direct swap. Compare the old and new drum side by side, count rollers, and if you are unsure send us your year, model and VIN. Every part we carry for this unit is on our 4T65E parts page.
| Fits | 4T65E 1995 |
| Part type | Input Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is listed with our input drums, but the part is a reaction sun gear and forward band drum assembly with the 14-roller late-style roller clutch race. If you need the input and 3rd clutch housing, look at our 4T65E input drum listings instead.
The late design began with 1996 model production. Early units used a separate roller clutch inner race, snap ring and spacer. Transmission Digest says the late parts back-service to 1991 only when the support, bearing and related parts are installed as a package, so compare your old parts first.
Plan on a new forward band, a fresh 1-2 roller clutch if yours is worn, and a full gasket and seal kit. Inspect the planet carrier that meshes with the sun gear and replace it if the pinions are loose or pitted.
Low line pressure from a weak pressure control solenoid, a worn servo pin bore and excess band clearance are common causes. Fix those or the new band and drum will burn again.
Use DEXRON-VI. GM lists DEXRON-VI for the 4T65E, and it is backward compatible where earlier Dexron fluid was specified on older 4T60E applications.
