dear all,
the ratios in gearbox is an interesting subject and I put together the list
of ratios below for our local jaguar club magazine the only missing ratios
is for 3.8 litre E type. which I now have.
First gear is way to low for an XK ie 3.375 the CR ratio is much nicer at
2.98 but if you drop a set of 2.4 MK1 / MK11 non synchro gears hey presto
you have a very usuable first gear at a price a lot less than finding an XK
CR gearbox. Even MK2 3.4 etc is an improvement and is very close to CR ratio
Gearbox Ratios
Several people have asked me what the gear ratios are in Jaguar gearboxes.
This of course affects the driveability of a car. This information is of
course important when different gearboxes are being fitted and differential
ratios changed. Someone else can interpret how the change in these ratios
will change the way your jag drives and accelerates.
Gearbox Ratios
MKV, MKVII, XK120, XK140, XK150
1st 3.375.1
2nd 1.982.1
3rd 1.367.1
4th 1.1
XK120, XK140, XK150 close ratio when fitted
1st 2.98.1
2nd 1.74.1
3rd 1.21.1
4th 1.1
MK2 2.4 litre
1st 2.67
2nd 1.74
3rd 1.25
4th 1.1
3.4 / 3.8 MK2 / S Type, 4.2 MKX, 420, E Type 4.2 2+2
1st 3.04
2nd 1.97
3rd 1.32
4th 1.1
E Type Series 1 3.8 Coupe /Roadster
1st 3.377
2nd 1.86
3rd 1.283
1st 1.1
close ratios
1st
E Type Series I 4.2 Coupe / Roadster
1st 2.68-1
2nd 1.74-1
3rd 1.27-1
4th 1-1
XJ 2.8 / 4.2, E Type Series II and V12 E Types
1st 2.933.1
2nd 1.905-1
3rd 1.389-1
4th 1-1
Overdrive on XK140 / XK150, MK1, MK2
Overdrive .779
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1 Jul 2007 10:53:33 +0200
The gearbox ratios for the overdrive boxes were the same
(there was also a close ratio version but thatâs not
dependant on having an overdrive). With the overdrive fitted
Jaguar changed the default rear axle ratio.
For the XK150 without overdrive the normal axle ratio was 3.54:1
With the overdrive the ratio was 4.09:1 giving an effective
3.19:1 ratio with the overdrive engaged.From: âKen Greenâ ken.green@kgcc.co.uk
Subject: Re: [xk] Gearbox options
I found the gearbox ratios for 120 moss box as:
first 3.375
second 1.982
third 1.367
top 1
does anyone know if the moss box with overdrive is the
same?