redhat

Mom has a 2005 Tahoe with a 230k 5.3 that is on it's way out.

I have a 40k LR4 4.8 that I'd like to swap in. I am assuming the computer will run the 4.8, will it have any negative side effects? If possible, could it be ran for a week or two before being re-tuned? Or can it live its life as such.

Thanks.

JoeNova

It'll be fine to drive without a retune. Performance wise, it won't be.

redhat

Thank you. She is a 65 year old woman who loves bingo, basket raffles, the weather channel and coffee. As long as it runs well and will not be hurt, it should be fine to me.

JoeNova

Under most situations, the PCM will be able to adjust the fuel trims. It won't run as good as it should, but it won't hurt it driving to bingo.

redhat

OK I gotcha, so a re-tune would still be preferred to obtain the 4.8's actual potential? I figured you meant the performance wise since I am going 5.3 to 4.8.

8.Lug

LSX Power Tuning

iTrader: (4)

It will get worse fuel mileage with the 4.8.....The best thing would just get the pcm flashed over to a 4.8 then it would be just like gm made it. It will run a on a 5.3 tune though.

redhat

The swap is done, the 4.8 runs good. Hasn't been tuned yet. I used the 5.3 intake (which I believe is the same), 5.3 injectors, rails, etc. Basically just swapped in a 4.8 longblock. Does this add any complexity to the mix? Are injectors different between 4.8 and 5.3?

LSX Power Tuning

iTrader: (4)

Same injectors as long as both were either non-flex fuel or both flex fuel.