I have a stock 1969 Powerglide which was rebuilt about 12 years ago in my 69 Camaro. I recently installed a new 330 hp GM crate engine and now I am experiencing a "slip" in between first and second. The problem gets worse as the transmission gets warmer. I am using Dextron III trans fluid and it is full and new. The trans works fine otherwise. Is this something that is easily remedied (i.e.: Shift Kit, Low Band adjustment, etc.)or is there a rebuild in my future? If so does anybody have any recommendations for a shop in the L.A. or adjacent areas for a street/strip application.
1969 350ci/330hp PG Camaro