Wanted late series 2 XJ manual gearbox

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1

I’m looking for a gearbox from a series 2 late 4.2 or 3.4 (which has the lower 1st )

Location:anywhere

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2

There is an early Moss gearbox on Pittsburgh craigslist:. $1200.

3

The XJ used the Jag all synchro box. The 3.4 cars had special ratios

The Moss box is totally different

4

I have an old disassembled 4 speed box that a racer guy threw in when I some other parts (about 15 yrs ago). Are there any particular marking to look for?

5

Hi - The most useful information is the letter prefix of the gearbox number. The number is stamped on a tag attached to the left side of the casing and also on the top cover.

6

I have one with overdrive

7

Can you share the letter prefix of the gearbox number?

8

I have one 5 speed Getrag and one 5 speed Jaguar manual transmissions. Make me an offer on either. and give me a shipping zip code.

9

Thanks for the info about the gearboxes
I wasn’t aware there was a Jag 5 speed- is that the rover LT77 (series 3 XJ), or is it a Jaguar 4 speed/ electric overdrive (in which case what’s the letter prefix on the gearbox number?)

10

Did you see the photos that I sent to you? What do you make of those markings?

11

Those numbers are casting/ part numbers rather than identifying numbers

I count 14 teeth on the first end of the cluster- so potentially correct for an XjS gearbox.

Do you have any of the other gears?

12

It is a JAGUAR manual 5 speed from a euro spec XJ. Fifth gear is an overdrive gear.
I believe the Getrag is a 265

13

The 5-speed Getrag was used on AJ6 engines, not on the XK. The 5-speed used on the 4.2 S3 was a modified Rover LT77 gearbox. Before that it was Jaguars own 4-speed, with or without the electric overdrive. If being fitted to an XK engine you really want one of the ones where the bellhousing fits, i.e. the latter 2.

14

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15

Thanks Dan
Frustratingly KGN isnt in my database!
I’ll do some more research
Russ

16

I dont record KGN gearbox prefix, thus must be some rather obscure application, but the K prefix letter consistently tells you the ratios, and the N suffix tells you it is a Gearbox that provides for an attached OVERDRIVE (re output shaft/rear gearbox cover etc)…
The KFN gearbox, as fitted to XJ6, has the following ratios, which will be same as this KGN gearbox…

2.933 : 1
1.905 : 1
1.389 : 1
1.00 : 1
3.378 : 1

Roger

1 Like
17

Thanks Roger
I also cant find KGN (and note your very helpful document)

There was a KGN for sale here in 2019, apparently from a 4.2 XJ6. Not sure if its the early 33/15 first or the later 34/14 one- i rather suspect the latter

18

It’s currently attached to a series I XJ6 engine so I’d suspect that’s where it originally came from.

19

It is a Jaguar 5 speed with the fifth gear being an overdrive gear from a series 2 or 3 XJ. I bought the transmissions from Peter Crespin of The Jaguar Journal some time ago for a couple of projects and probably only need one.

20

Usually that’s referred to as “4-speed with Overdrive”. It has 5 gears (but in theory could have 8).

What is the letter prefix of the gearbox number?