[Blake_H]

I haven't done it yet, but am amassing parts to swap a 5.3l into my '87 V10 4x4. I was told by several different folks that the only 'quick & easy' way to adapt the setup into an older truck was to use an NP241 out of a '90-'91 Suburban or Blazer. The 241 is supposed to bolt up but I'm getting conflicting info on whether or not you need an adapter to make it work. The 241 has the electronic speed sensor in it, which you need if you're going to use an electric cluster out of '90-'91 Suburban or Blazer.

All of this is based on using a 4l60e since that is what I'm planning. I have no idea what you would need to do to adapt it to a 4l80e.