white1

iTrader: (5)

As best I can tell doing my research on my phone with crappy service, I'm gonna need (to)

4l80e
converter
modify my transmission crossmember
shorten driveshaft
add 2 wires for ISS
modify grey transmission connector wiring.

This can't be it. What am I leaving out, forgetting, overlooking etc?

What all needs to be changed in the tune, and will my 4l60 flexplate work??

Raffman

iTrader: (9)

I don't know about grey connector, you can add the wires at the computer plug.
you need the 80 flexplate and yes def have to change tune.

charcold-bowtie

iTrader: (10)

swap the whole tranny segment in the tune, not shorten the diveshaft, but change the yoke and shorten it. Add the 2cd vss sensor to the pcm.
If you order a hybrid converter you can keep your flexplate,

brent5631

iTrader: (7)

looks like you got about everything.

fredkj3

iTrader: (1)

you have to extend one of the trans lines.. i used some brake tubing and a compression fittings... yes you have to swap two pins in that plug.. i bought a kit from speartech.... but it is real easy to move the 2 pins.... this guy usually has some transmissions... its where i got mine... his name is sam and he is in pierre part... his number is 985-414-0892.. get the yoke/ dipstick tube/ flexplate and shifter bracket when you get the trans....

GMCtrk

iTrader: (27)

You can get a oem trans line from a 2500 suburban it bolts right in. Mine was $30 from the dealership. It could probably be had to next to nothing from a junkyard.

FLT

iTrader: (1)

I know this might be a given in your house Matt but I see one thing missing. Looks like you have the rest pretty much covered! Good luck with the install. Vince