The crossmember can be used, I believe some holes slightly enlarged, a drill fixed it for me. Supposedly a TH350 crossmember can't be used with a 2004R trans but the way you are going works with slight modification. The trans lines can work but are at totally different angles, expect a lot of bending and swearing. I have gone back and forth on my 88, so I have done this both ways on an original 2004R car.