LS swap in a 1978 K25 with a 4L80E

[THI]

Originally Posted by toddoky

The 85-up TH400 transfer case adapter you have is not going to work directly with the 4L80 transmission. The O.D. of the index ring on the adapter will need to be turned down to fit the smaller diameter of the 4L80 case. Once that is done, you will discover that the mounting feet bosses on the adapter are going to experience interference with the 4L80 pan.
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Thank you for reminding me, I looked through my parts laying around and I did find an adapter with the correct part number (casting 15654927) for the 4L80E to NP241 so that by itself is not an issue.

Would still like to know from those that did this swap where they ended up with engine placement and other mods they had to do to the driveline.