Ford Transit Diff Ratio’s & Axle Swaps

“My van is screaming its nuts off on the motorway”, is a common complaint & leads many owners of rear wheel drive Transits get in touch hoping a remap will fix it but it is a common misconception that a remap can change this.. Whilst more torque & a quieter tuned engine can sometimes give the impression of less rpm for any given speed travelled, its just an illusion,

The true  solution is a different axle ratio, achieved by an axle or diff change.. if you have a 5.11 or a 5.13 ratio diff fitted currently, an indicated 70mph will be made using over 3000rpm..  Anything over 3000rpm can be noisy & uneconomical . I’d recommend around  1  “point” reduction  so something in the low 4’s like a 4.27 would suffice without acceleration suffering too much. How about the 3.73 ?  An excellent choice as 70 will come up about 2700rpm but a remap is needed to pull it if you’ve 100ps  & on a 115 , it would pull that  much better , so get in touch to discuss vantuner’ in house developed custom tuning options.

Vantuner doesn’t actually do axle  / diff changes but recommends Transaxle Services in Halifax )

Using the Ford Etis database

Anyone can enter their registration number or VIN here & bring up quite a detailed spec of their van..follow this link & select vehicle.. if the option to enter reg isn’t showing, go back to the home page , select preferences  & select united kingdom. the reg number entry should now work.. if your reg wont work enter your VIN.  This is a handy service for looking up what axle ratio was originally fitted , among other things.. to search for items once the spec is shown without trawling through every entry, press CTRL F , this in many browsers brings up a search widget for the current pages shown content.