Two other advantages of the ENV axle are the apparent ease with which wire wheel hubs can be fitted and its 3.643 ratio.
Some time back I was trying to decide the best gearbox solution for my 140. The Moss Box was in a pretty bad state and the overdrive unit needed some attention. After comparing specs for a number of different gearboxes I opted for a Classic Jaguar (CJ) 5 speed, based around the Tremec T5 WC (World class) unit. The T5 unit with its 0.77 5th gear is excellent in the 140, but when coupled with the ENV diff will provide even better motorway cruising speeds nicely within the XK engine torque range.
http://www.classicjaguar.com/ This is a brilliant site if you are not already familiar with it, mainly E types but XK's also, with literally thousands of detailed pics.
|ENV Series One (JHS1398) Diff Label gives ratios as 14 / 51|
which works out at 3.643 compared to 4.09 on the XK140
|Spread Sheet originally written to compare XK140 ratios shows 120|
with ideal cruising speed of 73MPH at 2500 with CJ 5 Speed. Perfect!