ross02ss

iTrader: (1)

I know there is a to of threads about this but can't find a exact answer.
I have 03 silverado that originally came with 4.8L.
Which If I'm not mistaken that's a 105amp alt.
The motor was swapped for a ls6 from a 02 zo6, but the original alt was put back on.

I'm wanting to upgrade to at least a 145amp and do the big 3 wire upgrade .
I'm told that 05-07 (07Classic) denali or duramax will be a direct swap . Just get a new belt as it's different size.
Can anyone determine or comment on this?
If so any part #s ?
Thanks

colekill

I did this to my old 99.

i just went to auto zone and bought a alternator for a suburban i think it was 130 or 145amp. didnt have to change anything but the alternator

Suburbazine

You'll need to get a belt for a 130/145A alt. The 105 uses a 20mm shorter belt. Other than that it's plug-n-play.

Or you could go insane:

gagliano7

Plug and play except like others have said you will need a longer belt. I got mine from a junkyard for $65 and a lifetime warranty.