I have a 2003 express 3500 van with the following:

6.0 LQ4 engine.
4L80E transmission
Dana 70S rear axle that measures roughly 72" WMS and around 51" between spring perches. It has disc brakes.

Has anyone used the LQ4 and 4L80E with custom ordered harness?

I would look to adapt an NP205 T case to the 4L80E

The truck I picked up recently still has the tornado and runs but not well and there's a lot of things that need worked out to try to get it running well. Since I already have this van I was thinking the effort might be better spent with a swap now rather than later.

Any experience or advice using these for a swap would be appreciated.