I have built several engines and done just about everything on cars. But I would not touch a AT trans rebuild for anything. No way. Very complicated and if you install something just a little bit off it will die on you in short order. Not worth it. I could see rebuilding a manual trans myself, or a diff. But not an AT trans.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9