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Old 07-04-2010, 05:18 PM   #1
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Default 4t60E swap to 4t65E HD

i have the 4t60E with 227,000 miles so i need to start p;aning on a replacement so im ready when i need it. but can i swap to a 4t65E HD with out a tune or would i need one ?

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Old 07-06-2010, 08:41 AM   #2
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You would need to add 5 wires from the trans to the pcm and swap it out with a year pcm that had the 4T65. If your car is supercharged the ideal pcm is a 1997. If not, you'd need to change the wiring harness as the pinouts at the pcm are different.
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