Naw, you can get a 200amp ACDelco that will slide right in. I put one my 02. The only thing you need is a new power cable. It was about $300 with the power cable but well worth it.2k1Sierra said:I just got a brand new 130amp alternator off ebay for $100 shipped. Any bigger than that, like a 180 or 200, won't be a direct bolt on. You will need special brackets or something...I forget.
Also, if you switch to a 130amp alternator (which are on the 6.0s) you will need a 6.0 serpentine belt.