Alez
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| posted on 20/2/08 at 09:07 AM |
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How do I check if I have a Quaife ATB diff?
I've heard that, if you jack up the car, turn one rear wheel with your hand, the direction of the other wheel will tell you if you have a LSD or
open diff. As I think about it, I guess this has to be done twice, first time with neutral engaged so that, if open diff, the torque that you apply
will go to the other wheel not the prop?
I would like to know if this simple test is also good especifically for a Quaife ATB or else how to tell.
The guy who sold me the Fury said it had one installed (from the original Pistonheads ad, "New Baby atlas axle (Narrowed from a Capri 3.0
(3.09:1 - makes first gear useable) built by Gartrac with Quaife uprated 2 piece drive shafts and Quaife ATB LSD)." ) and there are invoices
from Quaife an Gartrac that say that's the case, but a friend of mine says I have a normal open diff, based on visual inspection.
Cheers,
Alex
[Edited on 20/2/08 by Alez]
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CRAIGR
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| posted on 20/2/08 at 09:20 AM |
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Is that a visual inspection with the diff out or through the backplate or just looking at the axle.
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procomp
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| posted on 20/2/08 at 09:38 AM |
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Hi With the ATB dif unit if one wheel is lifted of the ground then it dose revert back to an open diff. It only works when both wheels are on the
ground.
I would however think that anyone who has spent that much money on an axle setup would have definitely put the ATB in. Only real way to check is to
remove rear plate and inspect.
HTH cheers Matt
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Alez
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| posted on 20/2/08 at 09:55 AM |
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Thanks guys. I don't know if the casing has been opened for this, I need to find out (the car is now at my mate's for some rework, and
that's 400 miles away!).
Sorry I'm so dumb but, removing this rear plate, does that imply emptying all the oil? If so, I don't doubt he did so because
there's no need for any rework there. Anyway I'll find out next time we talk.
As to the money spent, the invoices from Quaife and Gartrac are high, only thing I can't check is if they are from my car..
Cheers,
Alex
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Alan B
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| posted on 20/2/08 at 12:12 PM |
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Usual way is a quick check of your bank statement...you'll definitely spot a purchase like that....
HTH
Alan
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muzchap
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| posted on 20/2/08 at 12:35 PM |
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I'd check your WALLET if that's empty - chances are you do
Er - as everybody else says, both wheels should spin the same way when jacked up
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If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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muzchap
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| posted on 20/2/08 at 12:35 PM |
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Bah! alan beat me too it - I had the reply typed then 'work' got in the way!!! Boooooooooooooooooooooooooo!
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If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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Alan B
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| posted on 20/2/08 at 12:42 PM |
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Great minds think alike....or something like that...LOL
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Alez
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| posted on 20/2/08 at 01:13 PM |
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Very useful 
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Aico
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| posted on 20/2/08 at 02:32 PM |
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Quaife Torsen diffs have a pre-load so both wheels should turn the same way when the entire rear is lifted. I got this confirmed from someone who has
one in his kitcar.
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Alez
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| posted on 20/2/08 at 03:10 PM |
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Hi Aico, is that an ATB he has? As far as I know, these are not Torsens.. and my mates have been reading and seem to agree that the ATB may behave
just like an open diff on such a test..
Cheers,
Alex
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Aico
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| posted on 20/2/08 at 03:18 PM |
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He has a Quaife yes. Like I said Quaife has a preload so torque is being transmitted even if both wheels are of the ground.
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v8kid
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| posted on 20/2/08 at 05:25 PM |
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Mine didn't and I fitted it myself and bought it direct.
Boot it in 1st gear - two black stripes LSD one black stripe - open!
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Alez
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| posted on 20/2/08 at 08:11 PM |
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OK guys, I've found that they didn't remove this rear plate. The test they did was engaging neutral, lifting one real wheel only, and
turning it by hand, which they were able to do. In view of this and looking at your posts, I may be lucky with this after all 
Cheers,
Alex
[Edited on 21/2/08 by Alez]
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NS Dev
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| posted on 21/2/08 at 08:56 PM |
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As procomp and v8kid have quietly, and correctly, said,
with the QUAIFE diff, the rear wheels will go in OPPOSITE directions, just like an open diff.
If there is preload in it causing them to go the same way, then sorry but your diff is knackered, as one of the shuttle pinions has jammed.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 21/2/08 at 08:58 PM |
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quote:
Originally posted by Alez
OK guys, I've found that they didn't remove this rear plate. The test they did was engaging neutral, lifting one real wheel only, and
turning it by hand, which they were able to do. In view of this and looking at your posts, I may be lucky with this after all
Cheers,
Alex
[Edited on 21/2/08 by Alez]
Yep, that won't test the quaife diff
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Bob C
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| posted on 21/2/08 at 11:25 PM |
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I have tha ATB in mine, fitted it myself.
When new, the diff was quite stiff so both back wheels turned the same way, now it's done a few hundred miles the wheels turn opposite ways (just
like an open diff).
Fraid you'll have to look at it.
You might be able to see enough through the filler plug to differentiate. Here's a picture
Bob
 
Rescued attachment Diff5.jpg
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NS Dev
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| posted on 22/2/08 at 03:35 PM |
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when they are brand new the pinions will not shuttle so freely, hence the drag
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Liam
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| posted on 22/2/08 at 07:06 PM |
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Some cutaway drawings and literature i've seen on the ATB's suggest they have preloading springs in the centre so that they still have
some torque to operate with if one wheel goes in the air. Haven't played with one to confirm though...
Liam
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