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Message: <blockquote data-quote="Mr horsepower" data-source="post: 1534936" data-attributes="member: 15029">That is a casting number and unfortunately doesn't tell you what gearset is in the trans. In order to know the gearset, you NEED to get the numbers off the metal tag that is on one of the bolts that holds the back half of the case to the front half. Here is a picture from a Tremec T56, I could not find one from a TKX, but all Tremec Transmissions have one of these. Find it and post a pic. If you are only interested in lowering RPM across the board, do as others here have suggested and use the Tremec calculator. If you are able to drive the car, take it out for a drive, in 5th at 2000 RPM check the speed and match it up using the calculator.   [ATTACH=full]30921[/ATTACH]</blockquote>