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I have a 1993 k1500 Suburban with a 10 inch lift, 4.56 gears and 37 inch tires. Going on my third transmission in 4 years. I would like to upgrade to a 4l80e transmission but do not know exactly what I will need for a wiring harness and or computer or any thing else. Sub has a 350 with a 4l60e automatic already.
 

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besides changing parts for the 4L80E to fit your vehicle, transfer case , drive shaft, you must address the computer and wire issues.


It can be done , the Camaro/ firebird guys use a wire kit adapter to convert from a 4L60E to a 4L80
 

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the output shaft of the 4L80E is larger in diameter. You will need the correct parts in the transfer case for the 2 to bolt together
 
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