Upgrades

[Jdk843]

Hey guys, got a 4.8l 4l60e in my truck. It's 2wd. I would like to upgrade it. Now my understanding is that the block is the same size for 4.8/5.3, does that mean when I do a rebuild I just got the kit for a 5.3, and upgrade the computer? As for the 4l60e transmission, same question pretty much. 

 

After that, what ratio in rear end would be half decent for milage, but also have quite a bit of torque. I have 3:23 at the moment. 

 

Lastly, once all that is done, what performance upgrades could I do? I have every intention of taking it to tracks, but I also want to be able to drive it legally on the road.

[Bad Bowtie2]

Just add a small turbo charger to it, cat-back exhaust system, cold air intake kit, rear end with a 3.73 limited slip gears, and beef up your transmission to 4L65E internals. Add a trans cooler too. Then reprogram the PCM & enjoy the ride....