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Do you have the whole diff or just the internals? If it’s the whole diff, turn one of the output shafts and watch the other. If it turns the same direction then it’s a LSD, if it turns the other way it’s an open diff.
If you just have the internals, then idk
I bought the whole rear end and carried out the wheel rotation test and the wheels went in opposite directions. The strange part is that the diff cover bolts have the LSD tags. I took the cover and it looks like a standard open diff to me?
If it is truly from an XJS and a Dana, it will be LSD and 2.88:1 ratio. It was only used in the XJS 5.3 V12 1985ish for maybe 2 years.
Grant, everything about it says Dana LSD, Three bolt output shafts, no drain plug, square input flange, but the physical test fails? It looks like an open diff internally (which is why I wanted a picture to compare to. I'm not familiar with these diffs and was thinking this could be a worn LSD? The opposite wheel rotation test suggests that isn't possible?
Grant, everything about it says Dana LSD, Three bolt output shafts, no drain plug, square input flange, but the physical test fails? It looks like an open diff internally (which is why I wanted a picture to compare to. I'm not familiar with these diffs and was thinking this could be a worn LSD? The opposite wheel rotation test suggests that isn't possible?
The wheel rotation test only works if the diff LSD unit is working properly. On my DANA, it was not and the diff failed the rotation test, even though it was an LSD carrier in there.
Post a close-up photo of each side of the carrier and the end nearest the crownwheel and I should be able to tell for sure.
The wheel rotation test only works if the diff LSD unit is working properly. On my DANA, it was not and the diff failed the rotation test, even though it was an LSD carrier in there.
Post a close-up photo of each side of the carrier and the end nearest the crownwheel and I should be able to tell for sure.
I’ll get some better pictures in the morning. The guy I bought it from says he only wrecks XJ12 and XJS so he shouldn’t have any open diffs? He was also happy to refund if it’s open.
So I've been doing a fair bit of research and have now done the tear down on my Dana 44. What I know so far about what I have is as follows:
Dana 44 Trac-Lok LSD which has a 2-pinion single piece carrier (the other is the Dana 44 Posi-Lok (2-piece carrier, 4-pinion design))
It uses flat clutch packs
Its a 30 spline output drive (not 19, don't think any Jag IRS Diffs are 19 spline?)
It has a 2.87:1 Final Drive ratio (43/15 CW & Pinion)
The CW is retained by 3/8" bolts
The Carriers come in two variants based on ratio. 3.73 and down, and 3.92 and up
Some parts are the same as the Dana 44 Trac-Lok used on Jeeps, some are not.
Here's a few pictures of the tear down. 2.87:1 CW Gear Face 2.87:1 CW Mount Face 2.87:1 Pinion 26 Spline 2.87:1 Pinion Gear 15 teeth 2.87:1 Pinion Assy Pinion INBD Outer Race Pinion OTBD Support Bearing Assy and Seal Pinion OTBD Bearing Inner PN Pinion OTBD Bearing Outer Race PN Dana 44 CW PN 2.87:1 - 1 Dana 44 CW PN 2.87:1 - 2 Dana 44 Trac-Lok Carrier Clutch Drive Wear - 1 Dana 44 Trac-Lok Carrier Clutch Drive Wear - 2 Dana 44 Trac-Lok Carrier Clutch Face Dana 44 Trac-Lok Carrier Casting Number - 1 Dana 44 Trac-Lok Carrier Casting Number - 2 Dana 44 Trac-Lok Carrier Support Bearing Outer Race - 1 Dana 44 Trac-Lok Carrier Casting Number - 3 Dana 44 Trac-Lok Clutch Pack & Gear CW side Dana 44 Trac-Lok Clutch Pack & Gear non-CW side - 1 Dana 44 Trac-Lok Clutch Pack & Gear non-CW side - 2 Dana 44 Trac-Lok Clutch Pack Retainer Clips - 1 Dana 44 Trac-Lok Clutch Pack Retainer Clips - 2 Dana 44 Trac-Lok Carrier CW Retainer Bolts 3/8" Jag 4HU Dana 44 Trac-Lok Casing Jag 4HU Dana 44 Trac-Lok Casing Pinion OTBD Bearing Seat
Last edited by Woznaldo; Nov 4, 2020 at 12:22 AM.
Reason: Posi-Lok diff reference
I fitted an off the shelf Eaton TrueTrac Torsen-type carrier to mine. It is just fantastic. If you keep the original Dana LSD and rebuild it, they have a solid reputation for failing, as yours has, at about 60,000 miles to 80,000. Alternatively, you can fit a more modern far stronger Dana posi carrier instead of rebuilding your old one. I got mine from DTS: https://www.drivetrainspecialists.com/
great guys. In the XJS, Dana diffs are 30 spline, GKN Salisbury are 19 spline.
Last edited by Greg in France; Nov 4, 2020 at 05:23 AM.
So I've been doing a fair bit of research and have now done the tear down on my Dana 44. What I know so far about what I have is as follows:
... 30 spline output drive: (not 19, don't think any Jag IRS Diffs are 19 spline?) ALL DANAs in XJSs have 30 spline output shafts. ALL GKN Salisbury diffs in XJSs (the vast majority of XJSs have the GKN) are 19 spline. Dana diffs only appeared in V12 XJSs for two or three years in the mid 1980s.
It has a 2.87:1 Final Drive ratio (43/15 CW & Pinion)
The CW is retained by 3/8" bolts
The Carriers come in two variants based on ratio. 3.73 and down, and 3.92 and up
I do realise that this is an honest mistake, and please forgive the emphasis, but I am rather keen that no disinformation about this matter gets out there, because when I started on fixing my rear axle UJs, hubs and DANA diff, there was just NO decent clear and accurate info that i could find. rather, there was loads of completely inaccurate speculation and badly explained, unillustrated rubbish! That is the reason I went to such lengths on my axle rebuild threads to make it clear.
Greg
Last edited by Greg in France; Nov 4, 2020 at 01:43 AM.
All good Greg, hence why I left the sentence ambiguous. Thanks for clearing it up. I’ll check out the other threads and seriously think about another carrier that might do a better job.
All good Greg, hence why I left the sentence ambiguous. Thanks for clearing it up. I’ll check out the other threads and seriously think about another carrier that might do a better job.
