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The 1998 NPR auto has (approx) 1st 3.5 to 1, 2nd 1.5 to 1, 3rd 1 to 1 O/D 0.75 to 1 and reverse is 2.7 to 1. (Note the big jump from 1st to 2nd). These ratios are 'supplemented' by torque conversion to effectively produce 'gears' around these ranges. However, the Isuzu Australia website has technical specs on their models; including an historical archive where you can down load specs from earlier models. This site will give you the exact ratios (I have rounded) on autos and manuals. The site will also give specs on all N series including engine out puts axle specs dimensions etc. Worth a look; Google Isuzu Australia and click on Website. Go to truck specs and scroll down to Historical data. Select year of truck and tick disclaimer. N series for the last 20 years will list (NPR/NQR/NKR etc) together with 200/250auto/300 etc. Your cab chassis truck will up as basic line drawing with dimensions, fluids, axles, engines output etc. It is more comprehensive than an owner's manual but less so than a workshop manual. It's downloadable/printable making it handy for your future reference.
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