1990 XJS rear end compatibility
#1
1990 XJS rear end compatibility
Im currently doing a 350 swap. Already removed v12 engine and trans and bought donar car 1994 firebird lt1/t56 and have removed engine and trans. I have a 1990 xjs with a 2.88 rear end. I would like a list of all the jaguars with posi 3.54 rear ends that can bolt up to my jag? I heard it normally has to be a straight 6. So could some one list year and model for rear ends. Im new to blogs and no mechanic so please play nice i know some of you guys can be savages if some says something stupid. Appreciate the help.
#2
You can technically use all Series 1-3 XJ rear ends as well as the E-Type, Mark X, 420G etc.
As you state, the 6 cylinder models mainly had the 3.54 ratio.
Avoid anything before the E-Type (different axle) as well as after the Serie III XJ/XJS... They have the newer XJ40 style set up with a different differential. And of course everything after the XJS/XJ Series III... They all used a modified rear axle with a different differential as such.
As you state, the 6 cylinder models mainly had the 3.54 ratio.
Avoid anything before the E-Type (different axle) as well as after the Serie III XJ/XJS... They have the newer XJ40 style set up with a different differential. And of course everything after the XJS/XJ Series III... They all used a modified rear axle with a different differential as such.
#3
Any Jaguar IRS rear end gears will fit the XJS. Mine has 3.58 from an XJ40.
There are 2 ways to tackle this.
1. Machine a spacer and use the 2.88 centre.
2. Find a complete LSD with correct gears. The centres are interchangeable.
The 4.2L S3 XJ6 came with 3.07
XJS 6's had 3.54
XJ40 2.8L had 3.54 IIRC.
Look for the smaller 6 cylinders, they won't have LSD.
There are 2 ways to tackle this.
1. Machine a spacer and use the 2.88 centre.
2. Find a complete LSD with correct gears. The centres are interchangeable.
The 4.2L S3 XJ6 came with 3.07
XJS 6's had 3.54
XJ40 2.8L had 3.54 IIRC.
Look for the smaller 6 cylinders, they won't have LSD.
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Daim (12-11-2016)
#4
#5
The XJ40 drive shafts and outboard brake hubs can be fitted as well, all you need to do is bush the XJS LCA
#6