Reply to thread

Message: <blockquote data-quote="stutaeng" data-source="post: 29190" data-attributes="member: 6175">Another vote for a 4L80e swap as [USER=12914]@Tonimus[/USER]  pointed out. I did that on my 99 Silverado ECSB 2wd while I swapped from a 4.3 to a 5.3. On my truck configuration, there's no need for a drisveshaft shortening because the 2 piece driveshaft frame mount crossmember has slots for the center carrier bearing.LT1swap.com has information for repinning the case connector and adding the other speed sensor. A new sensor pigtail is like $15. You don't need the adapter and actually some of the adapters have had reported issues.There's a special yoke that mates the 4L80e output shaft and uses your stock driveshaft u joint. You'll also need to modify your transmission crossmember (or get an aftermarket one from ebay).It sounds kinda like a PIA, but it's pretty straightforward and easy. 4x4 does add a complexity with the Tcase.The good news is that after you swap a 4L80e, you can mash the skinny pedal all day long and that transmission is just gonna laugh at you! Lol</blockquote>