In reply to a message from XJ6CDN sent Fri 12 Sep 2008:
Leaving aside the issues of plumbing and pedal boxes, the gearbox
from an XK150 is not a 4-speed synchro, it is a Moss box. There was
no manual overdrive (MOD) box ever fitted to an E-type of any
series. So there are two incorrect things right there.
The MOD box from an XK150 is different from the gearbox and OD from
an XJ - both in terms of overdrive type and size, lever position
and overall length. The XK150 MOD box is the same as that from a
3.4 XK I believe.
An XJ manual OD gearbox and bell housing are the identical length
to any other XJ box, be it auto or non-OD manual (a type mostly
fitted to the smaller engined models which didn’t make it to North
America AFAIK). The propellor shaft will bolt right up for any XJ
auto/manual swap. No issues there.
So in terms of dimensions there is no problem if it is an XJ box
which will use a 4.2 style flywheel and clutch, but you have
several serious issues if it is an XK150 box.
The XK150 box would normally use a 3.8 flywheel, starter and bell
housing. If it has no bell housing you could fit a 3.8 or 4.2 one
so long as you used flywheel, clutch, clutch release and starter to
Be aware also that even if you went to all the trouble of fitting
an XK150 box you might not like the end product. The Moss box is an
acquired taste. It is one thing to crunch gears in a hairy-chested
sports car but not so nice in a suave sedan. If it is an XJ box you
should be fine.
To determine which type of box without seeing it, ask the box owner
what is stated on the small rivetted ID plate at the side of the
overdrive. If the plate says it is a ‘Compact Type A’ overdrive it
is an XJ box and you could use it. If not, walk away would be my
The original message included these comments:
4 Speed manual synchromesh transmission with electric
overdrive. Fits Jaguar XK 150 or XKE Series I (without OD)
I need to know if feasible and the complexity of that swap…
Thank you for your help!
66 2+2, 68 OTS lump, 94 X300 Sovereign, 94 XJR Manual
Cambridge, United Kingdom
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