Edward George
Member
- Posts
- 43
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- Fife
My speedo and mileometer are under-reading by about 23%. I’ve discovered that I have 3.54:1 ‘90’ diffs fitted front and rear. This is also bourne out by there being no oil filler plug in either the rear axle casing or diff housing. As far as I know I have a standard 2A gearbox and transfer box. Tyres are 205/80 x16. I’m surprisingly happy with the resulting gear ratios but I’d like to have an accurate speedo unit. I have the standard 1536 tpm version but if I fitted a 1408 tpm unit from a 109, this would only improve readings by about 9%. Am I forced to get my existing speedo unit recalibrated or is there another option? I reckon I need about a 1183 tpm setting.
