Has anyone heard of or done a 5 speed manual transmission in one of these jags??

 

The Driven Man (drivenman.com) has them for 12 cylinder XJ's but I haven't seen one for a 6 cylinder....I want one if anyone finds a source. I suspect there may have been a few manual transmissions that were exported exported. I do know that a few of the XJ6 2 door hardtops were four speed models.

 

I think Getrag has a 5 speed manual application. You may want to look at the ads in Jaguar World for some ideas. Won't be cheap though.

Mike

 

I did a google of "manaul transmission conversions for Jaguars" and got a bunch of hits. There is a really good piece by a gent ( Jag driers are gents) who did some research while building a LeMans style E type. Http://www.westnet.com/~mfrank/FiveSpeeds.html
Also, a site for a group in New Zealand that is making conversion kits.
http://www.conversioncomp.co.nz/index.php
As previously noted these are not cheap, $4000+ not including installation.

 

If you do your own work it’s very affordable to do the swap. Basically all you need is a simple adaptor that will take you a few hours to make. The rest of the parts are off the shelf. Here’s the adaptor. Ask I’ll walk you through it. L

 

I'm doing a 5spd conversion on a 1975 XJ6C. I started out looking to get the stock 4spd overdrive and had it on order but something went wrong with the shipper and it never happened. So now I'm waiting for a Toyota 5spd conversion that I ordered from Ebay. It uses the stock 4spd bell housing, release bearing, flywheel and pressure plate. They supply a 9.5" disc that works with the gearbox. Besides the gearbox assembly, I've searched out another pedal box, but you can have yours modified by the "jaguru" ( Ebay again). Manual center console inserts are available and you can find the tunnel cover too. My suggestion is but a parts manual and use that as a guide. As far as the Driven Man, they don't supply an XJ box, just for the XK's. There is another place that has an adapter plate for a Nissan ZX gearbox, but I didn't want to go that route as it's not as complete as the Toyota kit. I will definitely be posting all I'm doing once I'm finished as I'm overhauling the motor also...

 

"There is another place that has an adapter plate for a Nissan ZX gearbox"

Below is the manufacturer of the Nissan ZX trans adapter plate.

https://www.xcessivemanufacturing.co...g-5-speed.html

 

Since you are changing gearboxes? May I suggest you consider changing engines as well?
A V12 Jaguar will slide in there nicely. Smost like the factory designed it that way, oops sorry they did!!
You can probably source a good used V12 cheaper than you can rebuild your 6 cylinder.
What I found wonderful is how durable the V12 is compared to the 6 cylinder. It has to do with 2 things. Your 6 has a 4.17 stroke which means the piston really has to fly go from top to bottom of the stroke.
Meanwhile the V12 only had a 2 &3/4 inch stoke so those pistons wind up going less than 1/3 the piston speed at the same RPM. That means the rings seem to never wear out.
2nd. The load on those twelve pistons is a fraction of the load on your 6 cylinders.
Properly maintained that engine should last many many decades. Probably well over 500,000 miles.
One last argument. Everything you need to do the swap can be found in a rusty wreck of a non running car. For very tiny money. I noticed the front cross member has the holes in the same place the B12 engine mounts do. The wiring should be the same l( My series 1 is carbureted other than changing the single SU fuel pump I’m putting a tandem fuel pump in like the factory does. You can get fresh exhaust pipes in either stainless or regular steel.
I’d cheat a bit. And use the later ( mid 1977 and on through 1996 ) engine because it has a much better transmission. Still using the carbs though, because there isn’t a simpler carb in the world to work on. Every 5-10 years take the 4 Phillips head screws off toss the rubber diaphragm away. , Put the new one on and return the screws, repeat 3 more times. Close the hood and your carbs are taken care of for the next 5-10 years.
15 minutes the first time, less every time you do it.
Want an extra 40 hp? Cut of the end dog leg off the manifold and weld the carb mount on straight. 10 more horsepower if you swap it to HD8 SU’s

 

As the OP posted this in 2009 and has not visited the forum since 2010, I suspect they really don't care about an answer anymore!

 

Probably true but that doesn't meant that newer answers might reach some other than the OP who might be interested even just from a curiosity perspective.

 

I'm fixing to do this on Blue Six since I finally rounded up the bits. I'm using a Jaguar LT77 box (also used in the Range Rovers and Sherpa vans - Triumph used them in the TR8 although I think the final drive ratio was different). SNG Barratt had an OEM flywheel (the Fidanza ones have the wrong number of teeth). The clutch will exchange with the aforementioned vehicles, the spigot bearing is the same as a TR7 uses. I had a pedal box; the clutch master kit is the same as a Mini, and the clutch slave cylinder is nearly identical to the SII E-type (same stroke).

I've heard the LT77 boxes are not durable but my TR7 has one - they seem to be fine if you don't abuse them. A company in NZ called Dellows has an adapter kit for use with a Toyota Supra box.

 

I own a 1986 Range Rover Classic with the LT77 and a common upgrade it to the R380 transmission. Ashcroft Transmissions in the UK is the go-to for the LT77 and the R380.

Manual Gearboxes – Ashcroft Transmissions (ashcroft-transmissions.co.uk)