9.3 - Saloon Final Drive Specs ( Niel Syder,  August 15, 2005 )

I have done a little reading on the subject to see what’s
Available and have put together a gear ratio file (in excel) for
The different gears that have been offered on Jaguar cars and if
I was willing to separate the gears could be put into a MK2 axle.

I cannot seem to copy it in here but have copied the final speed
per 1000rpm for the different ratios. 3.54 looks good as the easy
option with a far improved 27.58mph/1000rpm. Anyone gone lower
with any effect or would not advise it? I am looking to make the car
cruise better but would like reasonable acceleration.

   The 2.4L engine in the car at present seems to like 2800rpm
as the maximum (can go higher but sounds like I'm doing it harm but
probably not). I would ideally like to be doing 80mph at this rpm
if the acceleration pay off was not to much, or finally is the
340 engine a different beast and will rev higher and smoother.


Model                  Final Gear Ratio mph/1000rpm in O/D


2.4 with O/D                4.55 21.46
2.4 without O/D                4.27 22.85
Mk2 optional extra         4.09 23.87
3.4/3.8 with O/D         3.77 25.90
3.4/3.8 without O/D            3.54 27.58
Series 3 XJ6 4.2 Auto       3.31 29.50
Mk2 optional extra         3.27 29.86
Series 3 XJ6 4.2 Manual 3.07 31.80
Mk2 optional extra         2.93 33.32
XJS                        2.88 33.90