Gonna buy 03-06 Yukon XL, SLT W/ 8.1L.
Once rig here, one of the big "to do" on bucket list is upgrade tyranny to best there is.
Forgive my Naiveté as relates to engine/tranny/rear end.
But would it be possible to upgrade from 4L80 to like a 5-6 speed, ie 6L90?
If I have posted this in wrong place, I apologize.
I am just on a mission to have a kick butt ride. Thank you for any thoughts and suggestions.
Upgrade tyranny? That kind of political talk can get you summarily banned at this 'forum' - a bit of a weird irony ...
ANYWAY
If your pcm can operate a 6L90 ... actually I THINK the 6L90 requires an ecm for the engine and a tcm for the 6L90?
Meaning you might need a major wiring harness overhaul, maybe a few other modules would need an upgrade.
Involved, but definitely doable.
You may be better off considering the Allison 6speed, the one that lots of people think is a five speed,
but becomes a 6speed after a tune?
What, specifically, do you mean by 'kick @$$ ride'?
Most people who don't know what they're really getting into say, 'x amount of horses',
instead of understanding how quick they want to cover the 1/4 mile, for example.
Are you more interested in towing/hauling strength, instead or high RpM power?
How much further off-road do you want to be able to go?
Define your terms.