Thats great, thankyou , One question ,, The letter for the year, is that published somewhere, so one can check a cars true year? As for gear ratios,, I will do more acurate testing and see if this car is pulling higher gear that the other one ,, If it is it can only be the final drive diff ratio that is different and all gears will be showing a higher gear, as overall ratio can only be changed with diff,, (and wheel size) OR in my case (God forbid) the speedo and rev counter are out ,, But that not what is indicated so far!! I presume Volvo did have different Diff Ratios available for different models ?? Or were there off the shelf manufacturers that made such things for those diffs, for competition work ? Will post results of tests when done, Cheers Bateye