Looking to buy a differential
#1
Looking to buy a differential
All,
I am in need of a good condition differential for a 1994 XJS 2+2 with the V12, if it makes a difference. I seem to believe I saw one not long ago on here somewhere, but of course, I didn't need one then!!!
Let me know if you have one or know of one.
Thanks!
I am in need of a good condition differential for a 1994 XJS 2+2 with the V12, if it makes a difference. I seem to believe I saw one not long ago on here somewhere, but of course, I didn't need one then!!!
Let me know if you have one or know of one.
Thanks!
#3
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Greg
#7
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I am almost certain that V12 facelift models with the four speed automatic gearbox have a lower (numerically higher) rear axle ratio than the three speed auto cars. From memory the facelifts with the four speed box have 3.XX:1 rear axle ratios, compared with 2.88:1 for the pre facelift V12s that have the GM400 three speed box.
Greg
Greg
Right!
It was 3.54 or 3.58
Something like that.
The extra power of the 6.0 engine together with the deeper gearing pretty much took care of the lazy off-the-line acceleration that the 5.3 cars with 2.88 diffs were known for. :-)
Cheers
DD
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#9
Diff center from XJ40, X300 etc will fit in the XJS housing, I have a complete XJR center and 3.58 gears in mine. Another option is Dana 44 parts these will also fit in the XJS housing, a vast choice of ratios available with this option, make sure they are 19 spline, with a Volvo pinion yoke you can even bolt it up to the original XJS tailshaft yoke.
#10
A wealth of information - as usual! Thanks everyone. I did confirm the 3.54:1 ratio for my year. And, am considering an alternate ratio moving forward. While I'm sure 3.54:1 is more responsive than the original 2.88:1, I would appreciate "more" if you know what i mean. I realize MPG would suffer a little but I'm okay with the trade off - to a degree anyway.
Any thoughts on ratios?
To answer the mileage question, she now has 42K.
Any thoughts on ratios?
To answer the mileage question, she now has 42K.
#11
XJ40 / X300 use the same rear end configuration it is completely different diff housings and not interchangeable with XJS, The XJS OB brake diff is the same as the inboard, the difference is the hubs. You can convert an XJS to outboard using XJ40/300 hubs and driveshafts. The only thing that requires mods is the outer fulcrum shaft is smaller in the XJ40.
The XJ40/300 diff center will fit in the XJS housing, as I have an X300 XJR center in my diff.
The XJ40/300 diff center will fit in the XJS housing, as I have an X300 XJR center in my diff.
#12
A wealth of information - as usual! Thanks everyone. I did confirm the 3.54:1 ratio for my year. And, am considering an alternate ratio moving forward. While I'm sure 3.54:1 is more responsive than the original 2.88:1, I would appreciate "more" if you know what i mean. I realize MPG would suffer a little but I'm okay with the trade off - to a degree anyway.
Any thoughts on ratios?
To answer the mileage question, she now has 42K.
Any thoughts on ratios?
To answer the mileage question, she now has 42K.
I know a guy here in Aus that has 4.27 gears 6.0L engines and acceleration off the mark is remarkable with semi slicks. BUT with street tyres he can not get traction.
Jaguar had
3.77, 4.09, 4.27
#13
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for my 1978 XJS Dana,had 3.07, i used a set of 3.73, from a Jeep diff.
went together without drama, set gear lash, been fine 16yrs!
only thing when driving hard, rear drifts out because Powerlok is locking tightly,like a spool.
i live with it ,but careful on wet roads, some times fun,but wife lets me know about it.hehe
went together without drama, set gear lash, been fine 16yrs!
only thing when driving hard, rear drifts out because Powerlok is locking tightly,like a spool.
i live with it ,but careful on wet roads, some times fun,but wife lets me know about it.hehe
#14
Whohoooo way to go Ron - I have the same problem with the wife, they do not seem to appreciate getting sideways.
#15
Adding to this thread and hopeing for clarity. Pretty much all earlier Jags ran the same diff (specifically the IRS setups). Being specific, they were all Dana 44 based units. But as with anything Brittish, there was many variations. Being Ratios, Open/LSD, Housing variations, Stub axle, etc, etc.
I would like to clarify housing differences and carrier differences. My 88 XJs has a 2.88:1 ratio LSD. I want a 3.54:1 or 3.31:1 ratio. I have suspicions the carrier and casing are slightly diffent to say a 3.54:1 setup. Casing requires some grinding? and the carrier is different (not sure if its offsets or just bolt diameters)?
Could I fit 3.31 or 3.54 gears to my original 2.88 diff. What mods are required or is it a straight fit. As I can get a 3.31 open diff but I require this to be a LSD. So I need to fit the 3.31 gear directly to my originals or will there be other issues as expected.
I would like to clarify housing differences and carrier differences. My 88 XJs has a 2.88:1 ratio LSD. I want a 3.54:1 or 3.31:1 ratio. I have suspicions the carrier and casing are slightly diffent to say a 3.54:1 setup. Casing requires some grinding? and the carrier is different (not sure if its offsets or just bolt diameters)?
Could I fit 3.31 or 3.54 gears to my original 2.88 diff. What mods are required or is it a straight fit. As I can get a 3.31 open diff but I require this to be a LSD. So I need to fit the 3.31 gear directly to my originals or will there be other issues as expected.
#16
Adding to this thread and hopeing for clarity. Pretty much all earlier Jags ran the same diff (specifically the IRS setups). Being specific, they were all Dana 44 based units. But as with anything Brittish, there was many variations. Being Ratios, Open/LSD, Housing variations, Stub axle, etc, etc.
I would like to clarify housing differences and carrier differences. My 88 XJs has a 2.88:1 ratio LSD. I want a 3.54:1 or 3.31:1 ratio. I have suspicions the carrier and casing are slightly diffent to say a 3.54:1 setup. Casing requires some grinding? and the carrier is different (not sure if its offsets or just bolt diameters)?
Yes if you use a spacer between the 2.88 carrier and the 3.xx crownwheel. Other option is to use Jeep Dana 44 19 spline LSD carrier with matching crownwheel and pinion. The only difference are the pinion input yoke spline and the crownwheel bolt size (Jag uses 7/16 and Dana is 3/8)
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