Converting my 72 XJ-6 4.2 to a manual trans taken from a '65 mK2 3.8

I still want to know what you planned to do with the diff.

I still want to know what you planned to do with the diff.

Dave,

Thank you, and i agree about the whole car but they are so rare to find..

I spoke to Walt Osbourne at Vintage Jag Works in ID, he told me i have a great Moss box, and that they are one of the most durable transmissions ever. He told me to pop off the top which i did and over the phone described what the sycros should look like and they look perfect. It is in incredible condition inside, Walt said it was cared for.

He told me this Moss trans is a straight bolt up just use a 3.8 flywheel, starter and clutch.
I am going with the Jag Trans.

Walt also told me Jaguar bought Moss right after the War and started building these transmissions in house, which i did not know, i thought that happened in the 60s.

Thanks for the help,

Matt

As I look at the posts I seems that you are in for an exciting time, Have you considered buying a series one (XJ6) manual transmission with overdrive?

As I was out driving around today, a thought came to me. You best bet is to find one of those 85-87-ish vehicles with the Gertrag as stock, preferably a rustbucket with shredded interior....and you will have all the pedals, lines, flywheel, clutch core, bellhousing, transmission, mounts, proper speedo gears, and differential.
Probably a whole lot cheaper than individual parts.
Just a thought.
Dave

I got a call-back just now.
Here's what the source says (and I have no way right now to find out if it's all correct:
1985-ish through 1987-ish models had (or could have) Gertrag boxes. You will need the bell housing from one of those.
That fits iron block and Gertrag.
Not sure on flywheel, etc...
Apparently XKS has the parts you need for the conversion.
Also, the tunnel/floorpan needs some work to clear the reverse hump on the side of the Gertrag.

That much for an old Moss box? Holy Smokes!
Have no idea on the AJ6 bolt pattern, but I may know someone who does.
I think you may find this is all cheap until you have to replace the pumpkin.
What have to done about the rear end ratio?
Dave

One final question,

I know of a 5 speed that came out of a euro XJS with an AJ6.

Will that Getrag transmission be a easier bolt up than my '65 Moss? I know they are good transmissions.

I do not know if the AJ6 alum block has a different bolt pattern at the bellhousing and cannot find information..

The owner is an British car mechanic and wants $1500 for it. I paid $1200 for the Moss..

I have to go back into work but look forward to your ideas.

Thanks,
Matt

Okay. Originally it was a 65, which is synchro. I have been told takes a different bell housing (front trans bearing) for the two. You will need the proper bell housing for a Moss box, probably flywheel.
And unless it's got a remanufactured warranty, or you plan on going through it first, be prepared to take it out again.
If you like them, go for it!
What about differential?
Auto rear stock was 3.07, optional (read that somewhere) was 3.30 or 3.31. At least in 1969, the stick version of the XJ6 was 4.27.
Gonna be fast, but slow getting there, and may use more clutches that you're happy with doing it.
May be able to get an add-on gear unit for the speedo to get it to read right.
Dave

The seller was a great guy and decided he was not going to use it in a old custom plymouth he is restoring and planned to put a low mile 4.2 XK motor in. I asked what he knew and he told me the p.o. told him it was taken out of a low mile 1964 MK2 that was very rusty. He said the p.o. told him it had 36000 miles which i highly doubt.
I am guessing the problem installing this trans will involve the starter and ring gear just having looked at it. I hope i can use it, I really like these Moss transmissions and have always come to a complete stop before selecting first gear anyway..
I can't upload a photo for a few days my wife took the kids to visit my Mother for a few days and has the digital.
I measured things in terms of the shifter position and it seems it will work. It is a little forward but will not interfere with the center console.

But it's a Moss box. No synchro in first, reverse and first in same upper quadrant (and let me tell you, on a RHD Jag that is a problem until you get used to the feel....like, gee, am I in first or reverse getting ready for the light to change).
Personally, I am looking for a 65 and later MK2 box and bell housing (locally) for my MK2.......I think you need to re-think putting an older style box in your 72.
Moss Box indicates early, no synchro in first.
I'd pass.
Dave

Thank you very much men,

Here are all serial #s

Jaguar MOSS 4 Speed Transmission with Electric Overdrive
With Mark II Bell Housing.
MARKINGS
1) OD Top Brass Tag
ÔÇ£Laycock de Normanville Overdrive Unit (obviously)
SN: 28/3028/001530
Sheffield EnglandÔÇØ
2)OD Tail Housing Casting Mark
ÔÇ£BIRMALÔÇØ (again)
3)OD Stamp Bottom Right
ÔÇ£NÔÇØ
4) Shifter Casting Mark
ÔÇ£C14468 B.S.K.ÔÇØ
5) Transmission Left Side Casting Mark
ÔÇ£2610ÔÇØ
6) Transmission Right Side Casting Mark
ÔÇ£DA15590ÔÇØ
7) Transmission Top Stamping
ÔÇ£GBN 34303 USÔÇØ

I will get a photo up, it shifts nicely and i have the shift lever and original knob, very cool.
It looks as if the trans must be in 3rd or 4th to go into overdrive in the way the o.d. unit is wired..
How to correctly energize this is also appreciated.

Thanks again, i really appreciate the help.

Matt

matthew there are a lot of challenges if using an earlier box. You said 1965 and it sems like that is not so.

http://www.jcna.com/classifieds/main.php?Vref=sc37&Vfnum=101&Vview=threa...
Go nine down, shows a GBN, earlier MK2, non-synchro box.

Oooops.
http://www.webtrade.com.au/s-type/pr04.htm
"Gearbox number: The gearbox number of four speed manual transmissions (both overdrive and non-o/d) is stamped on a small shoulder at the left-hand rear corner of the gearbox, and on the rim of the core plug aperture on the top cover. The prefix for the Moss manual gearbox is GBN, while the prefix for the Jaguar all-synchromesh manual gearbox is JBN. Borg Warner DG35 automatic transmissions have their number with a prefix JBC stamped on a plate attached to the left-hand side of the gearbox housing."

Looks like you have a 64 and earlier box, non-synchro-first, but that's just information from this Australian website.
Dave

http://www.jag-lovers.org/xk-lovers/library/gear_ratios.html
Apparently, we need the suffix to determine ratios.

The gearbox type is a GBN: Mark 1 and Mark 2 overdrive

GBN is for 2.4 litre saloon with overdrive (and possibly 3.4 and MK 2 as well, but the reference doesn't say). The tailcase has a tab mounting sticking down with two bolt holes. The speedometer drive is on the bottom, angling down and to the right. The top cover has no spacer and does not extend back, the shifter is directly above the maincase

(Rob Reilly's Moss Gearbox Index)

I will post a photo when i can.

Thanks, i am driving to NJ tomarrow to pick it up, the seller has a 4.2L XK motor for sale also as it turns out. I can see if the bellhousing lines up.

My only worry is the starter/ring gear,

I assume I need to use a 3.8L flywheel?

Ah. Differentials the same ratio?

Then it should fit--you will need a flywheel and linkage--new pedal box and a new trans mount for the rear.

He (seller) said a 1965 MK2.

Matthew--depends on what year the MK 2 was!