Just quick ???? Looking on eBay of course seen used nv3500 for 96 and up silverado says it came from behind a 5.7 350. I am wondering if this will in fact bolt up to rcsb 99 4.8l ?? Maybe change bell housing dont know if that's possible ... I do not know anything about these trans besides no one talks good about them... Mine has lost 4th don't drive it much but just seeing if maybe I were to get lucky.

 

You probably could if the Wikipedia page on the nv3500 can be trusted.