I have a1999 chevy silverado with a 4.8 want to know if can go to a 5.3 with out changing any of the wire or computers

Asked by Jan 17, 2016 at 05:05 PM about the 1999 Chevrolet Silverado 1500 LS Standard Cab LB

Question type: Car Customization

2 Answers

72,145

I do believe so, I was looking up parts to see if the same, and everything I looked at was the same for the 4.8 & 5.3. I know the OBDII computer has a good range for adjusting sensors. I am not seeing a problem.

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You do need the 5.3 ecu. The harness will the the same. The ecu is not hard to change. It will come out with the motor and harness anyway. If you really can't get the 5.3 ecu just have yours flashed. However it should "run" with the 4.8 ecu but it will lean out a little.

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