99slverZ
Club Member
Forget the Painless setup. You can use a 99+ F-body engine harness and just remove the extra wires. The Painless setup is $$ and last I knew it only worked with the (crappy) 1998 PCM. It's only slightly less stupid-easy to use original GM parts.
http://www.ls1tech.com/forums/conversions-hybrids/312119-ls1-swap-faqs.html
Been there... Done that... Used to be the moderator.
Last I looked at the foxbody swap questions you had to use part of one harness and hack it up. I'm just a big fan of plug and play. 98's are a pain but not impossible. Fine for his car. Anything serious is going to be using aftermarket anyways. I'm sure you can get it to work with the 99+ but its just going to take more wiring. Wiring hurts my head. :icon_redf