theconrodkid
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| posted on 9/7/02 at 03:26 PM |
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Seirra diff
Anyone know if the ordinary and LSD diffs are the same size externaly? 
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Fatboy Dave
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| posted on 9/7/02 at 05:23 PM |
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Almost.
They share the same 7" mounts (assuming you are talking the XR4x4 LSD), but the sides are obviously different for the different driveshaft types.
i.e. an XR4x4 diff will swap with a standard diff without any problems, as long as you have the right driveshafts etc.. to go with it.
Dave
Stop the planet, I want to get off
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theconrodkid
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| posted on 9/7/02 at 06:06 PM |
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Cheers mate,wondered why the n/s hub nut was lht and all the others ive ever done are rht
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Fatboy Dave
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| posted on 9/7/02 at 08:55 PM |
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Yeah, that's a 4be4 alright.
Dave
Stop the planet, I want to get off
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Liam
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| posted on 9/7/02 at 09:14 PM |
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I wondered that too - after breaking three Halfords professional breaker bars, and resorting to towing the thing to my local garage to get the n/s
rear nut off (yup I was tightening it).
Halfords lifetime gaurantee worked pretty well though...
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Max
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| posted on 10/7/02 at 08:21 AM |
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Do you think it's worth using a LSD for a Fireblade engined car? Are the hubs different for a normal unit? i.e. Could I use normal brake disc hubs
and a standard diff and then swap to a LSD later just by changing the diff and drive shafts? I'm told that the diffs can't be mixed and matched
between dics and drums - is this the case?
Cheers,
Max
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Liam
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| posted on 10/7/02 at 12:41 PM |
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I would have thought you definately would be able to change the diff and shafts for an LSD later.
I cant imagine your disc hubs are any different to mine, and my sierra has the LSD and associated shafts already.
Liam
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Fatboy Dave
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| posted on 10/7/02 at 06:43 PM |
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It is worth using an LSD (always), but the bits aren't interchangeable with each other. If you want to go from drums and an open diff, you need the
disc brake diff shafts, bearing carriers(hubs) discs and calipers, so yes, in this case they can't be mixed between discs and drums.
But if you have discs up the back anyway, the LSD comes free with the rest of it, so why bother swapping?
Dave
Stop the planet, I want to get off
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James
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| posted on 16/7/02 at 04:41 PM |
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Are the ratios between the standard and LSD Sierra diff the same?
Cheers,
James
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Fatboy Dave
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| posted on 16/7/02 at 05:00 PM |
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Depends, there is so bleeding many of them. Ford didn't have rules on what got fitted with what it seems.
As they stand, the XR4x4 V6 and the Granada 4x4 V6 have 3.62:1 LSD, the XR4i and the Granada V6 (non Scorpio) has a 3.36:1 open, and the Scorpio V6
has a 3.62:1 LSD
The Granadas get the 7.5" case, whilst the non-cosworth Sierras get 7"
Dave
Stop the planet, I want to get off
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bob
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| posted on 16/7/02 at 05:33 PM |
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Dave
My diff'n'discs came from a glsi sierra,so i was told anyway.
For some reason i was expecting LSD,but its just a regular diff with lobro joints unlike the tripod joints on the drum version.
Have no idea of the ratio and fords were not much help on this either.
Any clues apart from counting teeth,tab on diff is unreadable like the engine number on me 1st engine 
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Fatboy Dave
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| posted on 16/7/02 at 10:15 PM |
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yep, what you have is pretty standard of later Sierras. Discs=Lobro diffs.
There's a rule of thumb for spinnting the outputshaft and counting the prop roations, but it's a load of arse (can't remember it more like).
Flip the rear cover off and you'll find it stamped on the crownwheel 
Dave
Stop the planet, I want to get off
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bob
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| posted on 17/7/02 at 08:58 AM |
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Thanks dave
After finding an older haynes manual,which are much better than the shite new ones.
the 2.0 inj was 3.92 for manual and 3.62 for auto,will have a look anyway.
cheers 
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Fatboy Dave
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| posted on 17/7/02 at 12:29 PM |
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3.92 eh? Also found in the 1.6 estate, and favoured for bike engines and K series implants.
And don't you just hate the way the new Haynes' are printed on bog paper?
Dave
Stop the planet, I want to get off
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theconrodkid
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| posted on 17/7/02 at 05:08 PM |
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There is a very good reason their printed on bog paper,thats all the books are worth! 
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Fatboy Dave
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| posted on 17/7/02 at 05:47 PM |
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Bah, if only 
Have you seen their price in Halfords? sixteen bloody quid they are
Dave
Stop the planet, I want to get off
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bob
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| posted on 17/7/02 at 05:49 PM |
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Managed to scrub the tab up on diff and its 3.92
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Fatboy Dave
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| posted on 17/7/02 at 05:55 PM |
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No use for a V8 diff then
Glad you got the ratio ID sorted though
Dave
Stop the planet, I want to get off
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bob
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| posted on 17/7/02 at 06:06 PM |
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I dont think it was life threatening but i thought i should investigate this one.
Seems unless its 4x4 there were 3 ratios on regular sierras
2.0 carb auto was the odd one out at 3.38
everything else is 3.62 or 3.92
The estates are a mix according to the manual with 4 speeds getting the 3.92 and the 5 speed gets the 3.62
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interestedparty
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| posted on 17/7/02 at 08:18 PM |
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quote:
The estates are a mix according to the manual with 4 speeds getting the 3.92 and the 5 speed gets the 3.62
Are you sure that's right, Bob, normally the 5speed box, having the overdrive 5th gear, would also have the numerically higher ratio
John
As some day it may happen that a victim must be found,
I've got a little list-- I've got a little list
Of society offenders who might well be underground,
And who never would be missed-- who never would be missed!
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bob
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| posted on 17/7/02 at 08:21 PM |
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I'm just quoting from an old hanes manual,but i know what you mean i thought that myself
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bob
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| posted on 17/7/02 at 08:31 PM |
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Ah!! blimey theres more
1.6 with 4 speed economy was 3.13
and 5 speed was 3.38
yeah strange.
Also there was a trailer package on the 1.6 and that was 3.77.
ofcourse it could all be a missprint
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Fatboy Dave
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| posted on 17/7/02 at 08:55 PM |
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3.13 is, it should be 3.14 (also found on the 2.3 V6 ISTR?)
Ideal for a V8
Dave
Stop the planet, I want to get off
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James
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| posted on 18/7/02 at 01:40 PM |
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If I could possibly drag this conversation back down to my ignorance level please...
Can I conclude that if you fit a diff with a numerically lower ratio you'll be reducing your top speed but increasing acceleration? Or have I got
that the wrong way round?
Presumably this also means your speedo and odometer will be out as well?
And, for a given speed you revs will be higher and therefore fuel comsumption will be worse?
Questions, questions....
Cheers,
James
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Fatboy Dave
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| posted on 18/7/02 at 06:14 PM |
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Sounds right
A lower ratio (numerically higher) diff will make it lightening up through the box, make your speedo over-read, stunt your top speed, and degrade fuel
consumption (the engine spins the gearbox upto speed, but the diff is throwing away all those revoloutions, IYSWIM)
's like a fella that was going on at me that he had fitted a type 9 to his Xflow (didn't know what it had come from) and complained that he
couldn't pull away in first, and didn't have enough power to pull fourth. Wouldn't listen to advice either ('cos I was younger than
him........anyway, I digress)
Classic case of a short (numerically lower) diff. He fitted the four speeder back in the end, for want of another diff
Take it from uncle Fatboy, know what you have and know what you need.
Dave
Stop the planet, I want to get off
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