TransGo 4T65E Shift Kit for GM/Volvo, Fixes P1811 P0741

This is the TransGo SK 4T65E (part T84167G), the recalibration kit that fixes the shift complaints these GM front-wheel-drive transaxles are known for: hard bang shifts once the transmission warms up, long or flared shifts on light throttle, converter clutch chatter, no 4th gear, and no lock-up. It covers the 4T65E from 1997 through 2008, including the Volvo 4T65E. TipTronic-equipped units work with this kit as well, with the exception of the boost valve assembly.

You will find the 4T65E behind the 3.8L 3800 and 3.5L/3.9L V6 in cars like the Impala, Monte Carlo, Grand Prix, Regal, LaCrosse, Lucerne, Bonneville, and the Volvo S80 and XC90. The two codes techs chase most on these are P1811 (Maximum Adapt / Long Shift, which drives the transmission to full line pressure and makes every shift slam) and P0741 (torque converter clutch stuck off or slipping). This kit corrects the valve body pressure control and rebuilds the 1-2 and 2-3 accumulators so the transmission holds proper apply pressure instead of ramping to maximum adapt.

The job is done on the bench of the car; the transmission does not have to come out. Drop and drain the pan, pull the accumulator housing off the side of the case (expect a second wave of fluid when it comes loose), disassemble both accumulator pistons, install the new springs and spacers per the printed instructions, and set the new self-expanding 3rd clutch seal. Reassemble, replace the filter and pan gasket, refill with the specified Dexron VI, and set the level at operating temperature. Most people finish it in about an hour with a 1/4-inch ratchet set.

Installers repeatedly report the car shifting better than new afterward, with the long-shift code gone and firm, quick, controlled shifts on both light and hard throttle. Plan the fluid: dropping the pan and unbolting the accumulator housing loses a lot of fluid, so have two gallons of Dexron VI on hand and check the level hot before you call it done. Ships from the USA.