4T65E Shift Kit 2003, new and ready to install. Fits the 4T65E. Ships fast from the USA.
Most people who land on this page own a 2003 or later Chevrolet Impala or Monte Carlo, Pontiac Grand Prix, or Buick Century, LeSabre or Lucerne whose transaxle is already coming apart: long, slurred upshifts, a P1811 that keeps coming back, a forward band that let go, or black fluid with friction material on the magnet. Although it is listed as a shift kit, this is really a complete super banner rebuild kit for the 2003-up 4T65E with a TransGo shift kit packed inside. The friction set in the product photo is labeled for the GM 4T65E 03+. Per the listing, the box contains:
Steel plates and hard parts are not listed, so measure and inspect yours.
The 4T65E sets line pressure through a pressure control solenoid fed by the actuator feed limit valve in the channel plate, and the accumulators decide how long each clutch takes to fill. When the pressure regulator spring fades and the boost valve wears, shift times stretch out. Transmission Digest explains that the computer measures each shift and sets P1811 when a shift takes longer than about 0.65 second twice in one drive cycle, which is why fresh units often return with that code months after an overhaul. TransGo's SK 4T65E attacks that directly: a new pressure regulator spring for a stable pressure value, seven accumulator springs and three spacers to shorten shifts without making them harsh, and a replacement for the usually worn boost valve. TransGo lists it as correcting P1811, P0741 and P0894. Putting it in while the transaxle is already on the bench is the cheapest time to do it.
Pull codes and drop the pan first. A unit that only shifts long with clean fluid may need just the pressure control solenoid and valve body work, which our 4T65E pressure control solenoid guide walks through. If you find clutch lining, band material or brass in the pan, or the car slips in more than one gear, you are looking at a full rebuild and this kit makes sense. Our 4T65E common problems and diagnosis guide covers which failures point to a teardown.
This kit is marked for the 4T65E from the 2003 model year on. The 4T65E ran from 1997 through 2011 with running changes along the way, so an earlier car should be matched to a kit catalogued for its years, such as the 4T65E banner rebuild kit for 1999-2003. Check the transaxle ID tag and model year before ordering, or send us your year and VIN and we will confirm. The full model line-up is on our 4T65E parts page.
Follow the TransGo instruction sheet step by step and keep each removed spring and valve in order on the bench, because the accumulator calibration depends on every spring landing in the right bore. Soak new frictions and bands in fresh fluid before assembly, set clutch clearances with the new pistons in place, and inspect the forward servo pin bore; Sonnax notes case wear there lets the band apply late and break. TransGo also recommends pairing the kit with a new pressure control solenoid, which is not included. Inspect the 2nd clutch drum while it is out, and replace it with a new 4T65E clutch drum if the bushing or splines are worn. If the converter clutch was slipping, a new 2003 4T65E TCC solenoid belongs on the valve body too. Refill with DEXRON-VI, check the level hot with the engine running, and let the computer relearn shifts over several drive cycles.
| Fits | 4T65E 2003 |
| Part type | Shift Kit |
| Condition | New |
| 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.
No. Despite the name, it is a complete 2003-up 4T65E super banner rebuild kit: overhaul gaskets and seals, a friction pack, pistons, three bands and a filter, plus a TransGo shift kit.
This kit is for 2003 and later 4T65E transaxles. For a 1997-2002 unit choose a kit built for the early version, or send us your year and VIN and we will match it.
No. TransGo recommends installing a new pressure control solenoid with the shift kit, so plan to buy one separately if yours is original.
TransGo lists P1811 long shift time, P0741 converter clutch slip and P0894 component slipping, along with long or hard shifts and chatter on acceleration.
GM specifies DEXRON-VI for the 4T65E. Check the level hot, at operating temperature, with the engine running.
Steels are not listed in the kit contents, so inspect yours for heat marks and flatness and replace any that are blued or warped.
