LH6/6L80 into a 72 K25

[CRMW]

I've been gathering parts for a few years but its now time to do the ls swap into my old GMC. When I first got the trucks there wasn't very much info available on the 6l80 swap and a few other projects got worked on first, although i would periodically do some internet surfing as ask a few questions.

The Truck

1972 GMC K25 -
I picked it up a couple of years ago, its factory black and white deluxe two tone paint, mostly stock but was used on a ranch for the first 45 years of its life and had saddle tanks installed just to get it to the end of the driveway as it has 4:10's.

The sacrifice

2009 GMC Sierra 1500 4x4
6lH - aluminium block 5.3l
6l80 - Transmission

I like the idea of the 6l80 with the 4:10's, I have a 350 in my C10 with 4:10's and it just screams going down the road so hopefully the double overdrive will help with that and the gas mileage.

Now I seem to have another issue, too many threads and I'm having trouble finding a detailed "how i did it" thread among the results.

Im gonna keep on looking but if anyone knows of a thread, or has any ideas for me, please let me know.

Chris