4T65E Occasional harsh upshifts

Thought this question and answer would be helpful.
Hello,
I have a 2000 Olds Silhouette. I am sure it is a 4t65e transaxle with a 258mm converter. I would like to purchase a shift kit to address occasional hard up-shifts when tranny is hot. I was leaning towards a Transgo sk4t65e shift kit, but I cannot confirm it will work with the larger torque converter, since everything I can find seems to refer to a 245mm torque converter. I began to doubt whether the Transgo kit would work after looking at the Intense brand shift kit instruction, which address the two torque converter sizes. Does Transgo have a setup for both torque converters and if so, I would like to review the installation instructions before I purchase the Transgo sk4t65e to confirm it will meet my needs.

Answer:

The Transgo 4T65E shift kit will work for your car. The most important part of this kit is installed through the bottom pan and addresses the accumulators. The kit addresses the transmission and not the torque converter. The two problems that cause soft or harsh shifts are the accumulators and the EPC (Electronic Pressure Control) Solenoid. The easiest to correct is the accumulator problem since they are located in the bottom pan. I would suggest trying this first because this repair is permanent and will not need to be removed even if you need to go further.

4T65E Transmission slipping and or soft shifts

If your 4T65E transmission slips when shifting or is exibiting soft or lo-o-o-ong shifts, It may not be too late. The first step is to carefully examine the fluid. You are looking to see if it still looks relatively clean and does not have a burnt smell. The next step is to drop the lower pan and make sure there is no excessive debris on the magnet or in the pan. If everything looks good, you may be in luck. There are two options here. GM had a problem with the EPC (Electroinic Pressure Control) solenoid. It had a tendency to gunk up and cause low pressure that in turn caused soft or sloppy shifts. The other problem was in the accumulator area. The springs to control accumulator travel where weak and also caused sloppy shifting. You can choose one or both repairs to try and save your ailing transmission. The first involves removing the side cover and replacing the solenoids with approved and updated ones. The second involves the installation of a Transgo Shift Kit You will only replace the accumulator springs and not  internal parts since you are not rebuilding at this time. Hopefully this repair while a little time consuming will solve your problem saving you thousands on a rebuild.