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4T65E Shift Kit

Our transmission shift kit speeds up the shifting of any 4T65E. It works on the standard non HD and HD versions of the transmission and can be installed in 2 hours. Shift kits can increase the chance of hard part failure but they do increase clutch life. We do not recommend this kit for cars running 20" wheels due to the chance of breaking an input shaft due to additional rotational weight.

We found with many kits is the lack of instructions as it relates to shift firmness. Many users find themselves guessing at how firm to set up their kits or end up with a kit that shifts great on the 1-2 and weak on the 3-4. Because our kit comes with more shim sizes than our competitor's kit, you can choose 4 levels of shift firmness for the 1-2 and then again for the 2-3 shift. Only ZZP brings you a kit with the options and instructions to get the precise shift quality you desire and all at a price you can afford.

What is included in the kit are a bunch of various sized shims, a new transmission filter, and detailed instructions. You can generally reuse your trans pan gasket since it is rubber.

Perfect time to upgrade to Dexron 6 fluid.

Works on 4T65e '98+ GT/LS, '97+ GTP/GS/SSEi. Also works on Pontiac Montana.


Customer Reviews
4.7 Based on 54 Reviews
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Peter W.
United States United States



William B.
United States United States

Helped my long shifting trans problem

I have an 05 Pontiac Montana that has been hard shifting for a few years. A trans rebuild is 1800 to 2400 dollars. The 1-2 and 2-3 shifts became too long for the computer so it sets max trans pressure which causes hard shifting. Someone with a similar problem said he installed a shift kit and this helped keep his transmission running. The shift kit firmed up the shifts enough that the computer no longer sees any long shifting. The only trade off is now when I get ready to accelerate I have to give the trans a second or two before pressing the gas pedal. If I do so too fast the rpm's come up a bit and then the trans engages a bit harsh.

Bryce L.
United States United States

Good product

This is literally the first thing ive personally installed/maintained in a car. Zzps written directions combined with Mudfords video on youtube made it straight forward and simple. Thanks for making this type of mod accessable to a total newbie like me.

Eric R.
United States United States

good product

Very easy install. I wish I would have put in the 1 inch and 3/4 inch spacers in the 3-4 shift and 3/4 inch 3/4 inch spacers in the 1-2 shift. but the change is definitely an improvement over stock.

United States United States

Didn't install

I love zzp's parts. I ordered a PCM tune and shift kit,trans pan dexv1. guys to be honest I was so happy with how much harder the car shifted with ZZP'S tune that I really didn't want to mess WTH a shift kit. Now maybe you guys that don't have a trans tune this wld be great but I don't want to over do it and start hurting the trans. My opinion get the 1.0 tune first then if you want a harder shift then install the kit. I did swap to new fluid,filter,al trans pan. Just my opinion tho