Seriously, there has been some really good 4 speed auto conversion advice over the years on this site and all the good advice comes with the most important part; Buy a new high performance 4 speed auto trans to start with. TCI and Bowtie(LINK: http://www.2004r.com/trans/level2.shtml ) have them for around $1100 or a mild street version for $940. After you get all the other parts to convert you will have around $2000 into the conversion. Acurate will sell you the 350th for $435 with a 3 year warantee. If you go the 350 route you can get by with just buying the trans.