Quote by TommyS
Ok the gearbox is working well, just gave it a bit of thrashing on some tight hills and bends. One thing I noticed when driving at 2000 revs my speedometer used to show 65 mph and my sat nav 60mph. Now it shows 55 mpg when the sat nav shows 60mph. As the sat nav and revs correspond to what it was, I'm thinking that the gear ratio to the speedometer is for a vehicle with 15 inch wheels. I've got the old gearbox so can change it. Gave me a bit of a shock when I initially worked out the mpg as 18 at first fill. I believe it is off by about 10/11%
There are different gearing on the speedo drives, ( number of Teath) I'm told they are colour coded by year, the fix may be simply to replace the current one with the old one.
Shouldn't take more than an hour if the under tray is fitted.
