Does anyone know where I can get some information on the Jag IRS such as width, gear ratios, ect. I have someone interesed in my setup and I need some info. pretty quickly.

Thanks.

 

Series 3 XJ 6 or 12 rears are 61 inches flange to flange, Rear end ratios prior to 1981 were normally 3.31 and 2.88 after 1981. I have given you stock not any optional ratios

 

Great. Thanks alot. I appreciate the quick response Willard.

 

Maybe this will be of use to others too, after investigating I found all of the following a useful resource...

XJ6 - 69-73 (Series I)
Girling Callipers/1/2" Rotors
Ball Bearing Stub Axles
3.54 Gears
61 3/4" wide

XJ6 - 73-79 (Series II)
Girling Callipers and 1/2" Rotors but with Odd dust Cover
Tapered roller bearings on Stub axles standard 3.31 gears with locker optional
61 3/4" wide

XJ6 - 79-88 (Series III)
Girling Callipers 1/2" Rotors
Tapered roller bearings on stub axles with Drain hole in Stub axle flange
2.88 Gears Locker optional
61 3/4" wide

XJ6/XJ40 - 88-95
Completely different set up, not recommended for aftermarket applications

XJS - 76-87
Girling Callipers 1/2" Rotors
All Powerlock Gears
Tapered Roller Bearings on Stub axles
3.31 Gears
61 3/4" wide

XJS - 87-89
Girling Callipers 1/2" Rotors
Flat bottom diff with NO drain plug and 3 bolt mounted stub axles
American Dana Unit with weak traction lock (Not recommended)
2.88 Gears
61 3/4" wide

XJS - 89-95
Girling Callipers 1/2" Rotors
ABS on uprights/speedo pickup in rear aluminum diff cover
2.88 Gears
61 3/4" wide

Note: Easy way to tell if you have a Powerlok is to turn one of stub axle ouput shafts. If its a Powerlock the other shaft will also turn in the same direction. If not a powerlok the other shaft will rotate in the oposite direction.

Hope this helps.

Cheers
Lee

 

Great info. thanks alot.

 

Lwlandy has a much better and more complete answer then I did. Good info. I got my info on a call with a Jag parts house in Ill. Based on earlier conversations with their used parts guy (he seemed knowledgible) I asked him your questions. I am trying to resolve a lost UPS package to him that had a pair of 3 puck Jag front suspension cores in it. My first time with a UPS claim. They say that it is not quick.

Lwlandy:
I was told by him that my front suspension came out of an early XJ12. This was based on it originally having a vented rotor with a 3 puck caliper. Does that seem right to you? Does that also mean that my springs are a bit stiffer and my roll bar as well? Do you live fairly close to Holmsey?

 

Willard, I appreciate your response as well. Every bit helps. I'm sorry to hear about your lost parts. I know how it is when you are ready to make progress and waiting for those parts that never show up...at least not as scheduled. I hope you get those really soon.

 

Sorry 49Willard,

I am only using a Jag Rear in my Truck, so did not bother to investigate the front ends. I will see if I have anything though and get back to you if I have the details you need.

Thansk
Lee

 

Hi Willard, no Lwlandy lives at the other end of the UK to me.
I have some info on my web site that may help http://www.uk-hotrods.co.uk/v2/tech/...r/tech_jag.php

Most all PL I have seen have a finned ally diff cover to disperse the heat, maybe not all but that has been my experience and the open diff have had only a plain steel cover.

I have had a 198? V12 IRS that was 2:88PL and my early 1971 XJ6 was 3:31 open diff and I have not long bought a 1990 3.6 XJS irs that was 3:54PL just what I needed.

 

Holmsey, thanks for the link on the jag rear. My specific question was for the other end of the car/truck, i.e. the front jag suspension. I was told that the 3 puck vented rotor front suspension would have been an XJ-12. I find it a bit surprising that the early XJ 12 front brakes would be different than the same year XJ-6. I never saw the donor Jag for my front suspension. Any thoughts?

 

Sorry that info was for lowtrkn2k.

Willard I don't know for definite about your ifs I have never really looked into them. I just know my 1971 xj6 had 3 pot/puck calipers had solid rotors and I got 2 lots of 4 pot/puck calipers with vented rotors from an early 1980 or late 70's V12 and a later 1980+ V12 that are metric thread etc. Apart from that the only other difference is road spring spec. If you e-mail these guys http://www.jagspares.co.uk/Manners/company.asp I am sure they will be able to help you identify your ifs, they helped me in the past through e-mail.

 

Hi Willard,

A really useful site for Jag parts is:
http://www.jaguarclassicparts.com/we...atalogId=10051

You can search on the vehicle type/year and see all the individual components as they were shown on the oriinal microfish. I have managed to find a few parts I needed in this way.

I am not sure what you mean by "3 Puck" Vented Rotor I assume this means 3 piston caliper, but I just had a look on there for the front brake components and it looks like the XJ12 used 4 piston Calipers.

hope that helps,

Lee

 

Ah very interesting so your early (1971) XJ6 had SOLID rotors with 3 puck (piston) calipers. Is it possible that the vented 3 puck (from my front end) were also E jag? The parts house that I got my correct uprights/spindles for 4 puck calipers traded me straight up for the 3 piston cores that I had. It turns out that UPS managed to lose the cores and I am going thru a claim.

 

Happen they are E type Willard, to be honest mate I dont know enough about them sorry.

 

Thanks Dave. I sent an inquiry to Dave Manners. I suspect that they could be E jag since I had part of an old E jag supension (I think?) from many years ago that had the same caliper on it. That would explain the interest in having the cores which are somewhere out there in the lost by UPS land.