dag019
Well-Known Member
When I swapped them over I did not notice a difference in fuel economy with my 200tdi, But I did notice about an 8mph speed increase so started driving at 65-70 rather than 55-60. Had I remained driving at the slower speed I would have though I would have increased the mpg accordingly.
What engine, what tyres and what do you use the vheicle for to find the gearing too high? I run 265/75/16 with a 200tdi and have no problems with the gearing. Occasionally with a fully loaded 3.5t trailer I might need to slip the clutch a bit or start off in low box, but that is a small price to pay for the higher gearing. If this was its sole use however I would probably have stick with the defender box.
They are quite tall, in this picture you can see the difference against Disco tyres, the speed difference at around 50 was 5 mph. with the tall tyres and Disco transfer box I spent more time in fourth than fifth and on the motorway found myself changing down for hills as I usually run at 55 mph.
, cant remember the size
dag019
Well-Known Member
Looking at the picture I would guess at 235/85. What engine are you running? That sounds like under power rather than over gearing (arguably the same thing). Unless you have a tdi or later I would not consider a disco box as it will not have the power to utilise the higher gearing.
