L31MaxExpress
I'm Awesome
There is a reason my 2003 Tahoe I had was a factory 5.7L/5spd version. I drove my sisters identical 5.3/4L60E version and was not a fan. All revs and no real power. When I stumbled across that 5.7L powered unit especially with the 5spd cheap because of some minor issues I jumped on it at the time. The 2004 4.8L regular cab I tuned could not pull its way out of a wet paper bag on the stock tune and tuning it barely made a difference power wise (it was too lean and had too much timing with the intake, headers and exhaust on it) but did improve the transmission shifting. The stock cargo van I rented to move with 15 years ago, had a 4.8L/4L80E and 4.10s. It could not pull the empty van uphill at 70 mph with the cruise set, it would immediately downshift to 3rd, slow to 65 and hit 2nd. Got old in only a 250 mile trip. Once I loaded it up, it got even worse. I would put it on the floor when I saw a decent hill, it would rap up to 80-85 in 3rd then lose speed at WOT and downshift to 2nd and slow to 60.