Dan Solo

Let's rip the bandaid off; the Avalanche ain't a real truck yadda yadda. Having gotten that outta the way, I'm looking to breathe new life into my tired *** truck.

Initially, I was going to do an interior update; focusing on modernizing the infotainment system, which then became my wanting to eliminate my column shifter in favor of a console shifter to accommodate a sizable floating screen head unit.

I bought a used 2015 Camaro AT gear shifter, and in doing my research on how to make it work with the 5.3L ECM and 6L80 TCM I found out that the shifter won't work.

Then I looked into swapping the 6L80 for the 8L90 which brought me here, so I figured this would be a good place to get some advice on what people have done to update their GMT-900 powertrains.

Some engine/transmission combos I'm considering are 6.xL/8L90, TT3.6/8L90 for performance and fuel efficiency improvements, with newer 5.3L/8L90 as a last resort because I don't feel that they offer enough additional HP to justify the money spent.

So, what powertrain conversions have you fine folks done on your GMT-900s?

shakenfake

Fortunately we cater to all full size vehicles. Hell even Trailblazers

Okay I would NEVER EVER EVER swap a 6 speed for an 8 speed. The 10 speeds look really nice but I probably would keep the 6 speed for a while longer yet. **** the 8 speeds. They are garbage transmissions. I do not know if you could get a TT3.6 to work however I honestly don't see why not. I would recommend just throwing in a 6.0 or a 6.2 if you really want a new engine or going ahead and supercharging or turbocharging what you have.

Drspencer

iTrader: (1)

Where you're probably hurting is the 3.23 or 3.42 axle that thing has. That will take some of the pressure off the trans when trying to move that 5500lb beast. I loved my avalanche but no 6.0/6.2 option and the Escalade EXT only came with a 5.3 in 2WD form. Agree with the above, though. Asking for trouble on the 8 speed and you can make a robust 6 speed with what you would spend trying to make the 10 speed work. Also, yes, a drop in 6.0 or 6.2 would get the truck back on the road sooner and reliable.

smokinlmm

I agree about the 6l80, they can be built to last now. The 8 speed detonates at factory power levels. If you want a bad *** trans factory buy the ford 10 speed.