4T65E Sprag Clutch 2003, remanufactured and ready to install. Fits the 4T65E. Ships fast from the USA.
A 2003 or later Impala, Monte Carlo, Grand Prix, LeSabre or Lucerne that revs and will not pull from a stop, or that loses drive in third, may have a failed input or third one-way clutch. This is the 4T65E input and third clutch assembly for 2003 and up transaxles, sold as a three-piece set: the input one-way clutch, the third one-way clutch, and a new aftermarket input sun gear. Buying the set together matters on this unit, because GM requires these parts to be used as a matched group.
Both assemblies live in the input housing. The input one-way clutch locks to carry input clutch torque to the input sun gear in first, then freewheels when the second clutch takes over on the 1-2 shift, which is how the 4T65E makes that shift without timing two clutches against each other. The third one-way clutch does the same job for third gear and overruns on the 3-4 shift.
At the start of 2003 production GM changed both parts. Transmission Digest reports that the earlier serviceable dual sprags were replaced by pawl-type one-way clutches that cannot be taken apart, and the input outer race went from 32 splines to 30, with a matching 30-tooth input friction. GM's note is blunt: the new parts must be used as a set and not mixed with the earlier sprag pieces, or internal clearances are wrong.
Verify fluid level hot and rule out a sticking EPC solenoid first, using our 4T65E pressure control solenoid guide. A slow or missing engagement into Drive has several causes, and the 4T65E delayed engagement guide walks through them in order. Once the input housing is out, hold the outer race and turn the sun gear by hand: each one-way clutch should lock solid one way and spin freely the other. Any slip, roughness or locking both ways means replacement.
This set is listed for 4T65E transaxles from 2003 on, covering the Impala, Monte Carlo, Grand Prix, LeSabre, Century, Lucerne and related GM front-drive cars through 2011. To confirm you have the 2003-up design, count the teeth on an old input friction: 30 teeth matches this set. A 32-tooth friction means you have the earlier dual-sprag build. Transmission Digest notes the newer parts can back-service an earlier unit only when the complete package, including the matching input frictions, is installed together. If you are unsure, send us the year and VIN. See every part for this unit in the 4T65E collection.
| Fits | 4T65E 2003 |
| Part type | Sprag Clutch |
| 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.
Three pieces: the input one-way clutch, the third one-way clutch, and a new aftermarket input sun gear.
This set is listed for 2003-up. Earlier units used the dual-sprag design with a 32-tooth input friction. GM allows the newer parts in an earlier unit only as a complete package with the matching frictions, so send us your year and VIN first.
Count the teeth on an input clutch friction. The 2003-up pawl design uses 30 teeth; the earlier sprag design uses 32.
GM states these 2003-up parts must be used as a set and not mixed with earlier sprag parts. Replacing both together avoids clearance problems.
Input clutch frictions, input housing sealing rings and seals, and the filter. A sticking EPC solenoid should also be replaced if the unit showed long shifts.
