Technical Gearbox identification of numbers 20um04 or 20um05 2.8jtd

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Technical Gearbox identification of numbers 20um04 or 20um05 2.8jtd

nickwar

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Can anyone throw some light on the difference between a 20um04 and 20um05 gearbox. I have fitted to a 2.8jdt 2004 model a 20um04 box. I have been offered a 20um 05 box, but can see little difference. Would it be gear ratio perhaps? Thanks in advance
 
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