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Old 01-10-2011, 02:31 AM
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Jag rear end

Does anyone know what year, model Jag rear ends have posi track.
I do not think mine is can I change it by just adding posi
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Old 01-10-2011, 09:39 AM
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Gordon (I know of you from the NTBA and T-Bucketeers sites), the guts of the Jag are essentially a Dana 44. My understanding is you can drop in any Dana 44 ring carrier and posi unit, although I have not done it myself. The Jag in my T is non-posi, but it hooks both sides pretty evenly.

As far a which years and models had posi, the only consistency I found while researching for my rearend is that the 12-cylinder XJSs seemed to more consistently have posi. By the way, Jag calls it "Power-Lock."

Lee
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Old 01-10-2011, 09:42 AM
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welcome
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Old 01-10-2011, 10:57 AM
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Gordon,

Check your tag, if it has "PL" on it, then it is posi. Lee is right, all the 12 cylinder have posi (but remember the brits call it "power lock") some of all the rest have power lock also.

Bob
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Old 01-10-2011, 11:02 AM
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Gordon,

I don't know if this copy and paste in the correct format, but here goes.....



Year
Model
Series
Track Width Gear Ratios
Powerlock
Oddity
1960-1963
XKE
I
53.125”
3.54:1
all
hub

1964-1967
XKE
II
53.125”
3.54:1 or 3.31:1
some
hub

1968-1970
XKE
III
53.125”
3.31:1
some
hub

1970-1974
XKE

56"
3.31:1
some
hub

1960-1969
3.8S

56"
4.54:1 or 3.31:1
some


1969-1973
XJ6 & XJ12
I
61.75”
3.54:1
XJ12 Ball bearing stub axles

1974-1979
XJ6 & XJ12
II
61.75”
3.31:1 or 3.07:1
XJ12

1980-1981
XJ6 & XJ12
III
61.75”
3.07:1 or 2.88:1
XJ12

1982-1987 XJ6 & XJ12 III 61.75” 2.88:1 XJ12


It didn't but here is how you can figure out my mess, the words "some" and "all" refer to power lock (posi). But again, if you still have the tag look for "PL".

Bob
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Old 01-10-2011, 11:18 AM
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If you don't have power lock and want to upgrade, I'll post on that next. But as Lee said, even without power lock, this IRS will hook and book. One draw back to power lock is the potential to spin out because both rear tires are spinning.

The Jaguar IRS unit was developed and built by Spicer here in the states and then shipped over to England as a unit. This means that most of the parts are of American sources and easy to get. All the bolts, nuts and threads are SAE. The half shafts use standard Chevy U-joints and the U-joint flange on the front of the differential uses a standard Ford U-joint. Even the wheel bolt pattern is “American”, all though unfortunately its 5 on 4.75” pattern makes it Chevy. The differential is basically a Dana 44 so locking carriers, ring and pinion gear sets and bearings are relatively common and come in a wide variety of performance applications. I say that the differential is “basically a Dana 44” because although almost identical to a Dana 44, it is actually Spicers earlier design for this type of differential and is called a Salisbury differential. Not all of the parts on the Jaguar IRS unit are common, especially the brake parts, however, any non common parts can be purchased from Jaguar specific suppliers and/or the host of aftermarket suppliers that specialize in putting Jaguar IRS units in other types of vehicles.


Bob
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Old 01-10-2011, 11:29 AM
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If you are looking to change gears, you can use Dana 44 gears, however, if you use them with the carrier from the Salisbury differential, the bolt holes on the carrier for attaching it to the ring gear will need to be sleeved or shoulder bolts will need to be used because the holes in the Salisbury carrier are 7/16" and the holes on the Dana 44 ring gears are 3/8". What ratio are you running now? I'm running 3.54, and with the new TKO 600 5 speed I'm putting in should give a 65 mph cruise at around 1700 rpms with my 31" tires.

Bob
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Old 03-11-2013, 07:01 PM
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Quote:
Originally Posted by deckofficer View Post
If you are looking to change gears, you can use Dana 44 gears, however, if you use them with the carrier from the Salisbury differential, the bolt holes on the carrier for attaching it to the ring gear will need to be sleeved or shoulder bolts will need to be used because the holes in the Salisbury carrier are 7/16" and the holes on the Dana 44 ring gears are 3/8". What ratio are you running now? I'm running 3.54, and with the new TKO 600 5 speed I'm putting in should give a 65 mph cruise at around 1700 rpms with my 31" tires.

Bob
I know this is a old thread.. But what did you do for the outer pinion Brg? The jag pinion has a 1.180 pinion shaft and a standard Dana 44 pinion shaft is 1.120 for the outer Brg.

And the step that the Crush sleeve is about 2" lower on the factory jag pinion.
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Old 03-11-2013, 08:26 PM
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More Jag info

I have about 10 pages of jag info in one of my notebooks, I got a lot of info from the uk-hotrods.co uk site. they also listed a 409 ratio available when a 2.8 L engine was used, I have never heard of a 2.8 engine imported to the states. My son has a Jag xj6 rear in his 22 dodge lakester and we have 4 Irs's setting on pallets for our projects.
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Old 03-12-2013, 09:52 AM
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I may have figured it out.
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Old 03-23-2013, 08:23 PM
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If you have a factory 287 ratio it gets a little more complicated to do a ratio change. I've had a few 287 ratio's with power lok cases lately with the customer wanting to change to 354 and 373 ratio.
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