Originally Posted by LOWnEASY

Pre 95? Don't have the neutral safety switch, the shift shaft is to short and there is no mounting tabs to screw the nss to, and I'm pretty surd the pcm needs to know the gear selector for rpm differences from park to drive but nothing more that I know of. <- (don't hold me to that)
I picked up a 93 4l80 from the local yard for 300. Fluid was brown (uh oh) but I threw a trans go HD 2 in, longer shift shaft. A little bracket with spacer to mount the nss to the trans using pan bolt. Circle d 3200, no boost yet, but has held up well to my cammed 4.8 and heavy foot.
The wiring is pretty straight forward. Swap 2 wires around in the main trans harness and add wires for the second vss
The swap is straight forward and should be butter by the looks of your fab skills.

The worst part is the bitch is HEAVY!!!
I put mine in with the truck on jack stands 3 times by my self with just a floor jack. NEVER again!

Originally Posted by LOWnEASY

As for the drive shaft and yoke, there are conversion u joints to run either 80e yoke or 400 yoke. I lucked out and have a 95 work truck and the shaft is larger diameter and had the 80/400 style 3X spline count yoke
But the trans I got bit me in the ***, it had the short spline output and the tail housing was bolt on only yoke so I had to swap it out too, (the yoke wouldn't go in, its the tail housing with 4 bolts on it for tail mounted park brake) other than that its gravie.

Originally Posted by TheBeeblebrox

I've got a Jake's stage 2 '95 core 80e in my truck, it has the mounts for the NSS (my 60e NSS bolted right up) and the correct length shift shaft (they might have swapped it out looks like a long shaft).

If you are going to run a stock 80e converter you will need the 6.0l flex plate with the 6 bolt pattern and it will already have the spacer.

Your 60e trans mount is the same as an 80e mount (the one that bolts to the crossmember).

For my driveshaft/yoke I was able to use the stock shaft with a conversion u-joint and I bought the yoke from Jake's, its a Sonnax forged piece (short style), but I think they machine the output shafts to accept a slip yoke depending on the style. All I know is everything works.

Originally Posted by GMCtrk

If you use a stock flexplate, make sure you get the updated 4l80e version. The older ones have a been tendency to crack under power.

Originally Posted by boostedsl2

I must have missed this before. So I need to license an tune that has an 80e?

Any suggestion which model/year/engine that i should license? I believe I can grab a stock 2001 silverado 6.0L SS/HD tune. That would work right?

Originally Posted by AJII

No, just find a tune in the repository from a 2500hd thats the same year as yours and send that tune and your tune to support@hptuners and tell them you need a trans segment swap. Done.