4T65E Hard Shift-Solution

**Bronco Boy** · 05-28-2012

Originally Posted by Momof2

Can I get an update, just read all 5 pages of this and would like to know how the car is now? I am having this problem on my 99 gp gt and found this very informative. Thank you!

Been just over a year (26,000km / 16,000miles) since my shift kit went in and it is still doing its job. After installing the kit, the only negatives were that when warm, if I romped on it, the 1-2 shift would shudder. I seldom romp on it, so not a big deal. The second thing was I can hear the pump wining, ever so slightly. Both issues are the same now as they were a year ago. No better, no worse. Hoping to get a few more years out of her.

**Shadetreelifer** · 05-28-2012

I used the ZZ Performance shift kit plus I bypassed the radiator oil cooler with two Hayden Maxi-Kool XL Transmission oil coolers mounted in front of the a/c condenser. This stopped the hard shifting by keeping the trans below 140 degrees. The kit alone did help, but in my car keeping the trans fluid cooler than engine coolant temp was the best fix. I have about 15,000 miles on the ZZP shift kit and 220,000 miles on this 2000 Pontiac Grand Prix GT. I purchased this car at about 144,000 and my wife loves it. Yes, the hard shift when hot was the reason, among others, that the last owner sold it. It has been a restoration project for me. Love that stuff!

Many thanks to all the contributors here at gpf, especially, jbamonte, for this fix.

**Bronco Boy** · 02-18-2013

Originally Posted by Bronco Boy on 05/27/2012

Been just over a year (26,000km / 16,000miles) since my shift kit went in and it is still doing its job. After installing the kit, the only negatives were that when warm, if I romped on it, the 1-2 shift would shudder. I seldom romp on it, so not a big deal. The second thing was I can hear the pump wining, ever so slightly. Both issues are the same now as they were a year ago. No better, no worse. Hoping to get a few more years out of her.

Is it update time already?

Has been almost two years since the shift kit was installed; 44,772km / 27,820 miles right now. Nothing new to report, same as above.