Jubal
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| posted on 16/1/06 at 08:20 PM |
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Diff conversion
I didn't built my Indy so am flying a bit blind. It has an open diff and appears to have had a conversion to run disk brakes but keep the
original (push in) drive shafts. I'm keen to fit an LSD I picked up recently but I need a bit of advice about the best way forward? Can I modify
the LSD to use the push in driveshafts by cannibalising the existing diff? How easy would that be and what's involved?
Many thanks
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mookaloid
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| posted on 16/1/06 at 08:27 PM |
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Mmmmm tricky one that,
there was a thread recently about making hybrid drive shafts with different joints at either end which would help you with this - have a search for
it.
It may be possible to cannibalise the existing but no-one seems to really know.....
HTH
MArk
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billy
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| posted on 16/1/06 at 08:45 PM |
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yep, do a serch as ive seen pics of it done. the splines are the same both ends of shaft so you can take off the push in type and put a bolt on lobro
type on the end.
luego-lo-cost finished,vauxhall 16v 2.0,twin 45s de-dion rear set up
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RichieC
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| posted on 16/1/06 at 09:09 PM |
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I know, cos Ive done it.
Have a search for the thread though, there was lots of good info which came out as not all Sierras have the same number a splines on the shafts and
therefore are not interchangable.
Depending on which car the shafts you have came from, it could be as easy as popping off the Tripode joint and replacing with a Lobro from a bolt on
shaft.
Here is the thread
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Jubal
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| posted on 16/1/06 at 09:18 PM |
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Thanks for the link. I remembered the thread when mookaloid mentioned it but couldn't find it. Looks like a plan to get me some new driveshafts
is in order.
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RichieC
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| posted on 16/1/06 at 09:25 PM |
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Not sure if the thread says this but I bought a set of Scorpio shafts off eBay for a fiver. To save on postage I had the seller chop them and only
send me the joint and about 4" of the shaft.
Its a shame cos the joints are available new. The only reason you need a second hand shaft is for the backing cover (the inside of the joint which
the gaiter clamps to) as these although listed by Ford at £4 each are no longer available. So I have brand new joints with reconditioned covers, the
old joints went back exchange for the new ones.
Good luck, dont be put off, it CAN be done, there is much debate and scepticism about this for some reason but providing you get the right splines on
your donor shafts (details in the link), there is nothing to stop you doing it.
Rgds
Richie
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RichieC
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| posted on 16/1/06 at 09:36 PM |
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Sorry mate, thats not correct.
The LSDs which were fitted to XR4x4 and 4x4 Cossies were 7". The 7.5" LSD diffs were RWD Cossie and Scorpios.
Later Scorpios got traction control so the LSD was no longer required. Combine this and the fact that anything Cossie related suffers from
"Cosworth Tax" ie prices are 3 x higher for no good reason, and youll find loads more LSDs from XR4x4s as they all had one (2.8 and 2.9
variants).
Richie
[Edited on 16/1/06 by RichieC]
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Jubal
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| posted on 16/1/06 at 09:43 PM |
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First mention of that Snoopy but I'll be sure to check.
I found the statement below on the Sierra owner's club website. Someone was asking about fitting a diff from a drum braked car into his disk
braked car. Obviously I'd be doing it the other way round but it could save me buying new driveshafts and sounds simple?
"What you need to do is undo the rear cover of both diffs, look inside and you'll see a circlip each side on the disk brake diff drive
flanges, get these off and the drive shaft flanges just slide out. Simply fit these into the drum brake diff (not forgetting the circlip) and seal the
cover with a thin bead of silicone sealer."
[Edited on 16/1/06 by Jubal]
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JoelP
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| posted on 16/1/06 at 11:00 PM |
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surely its easier just to get a full disc brake back end and use the bolt on shafts with the LSD?
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Jubal
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| posted on 16/1/06 at 11:05 PM |
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It's therefore the same problem whether you're converting the driveshaft or the diff? The cheaper option has to be favourite as a first
pass. TVM.
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Jubal
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| posted on 16/1/06 at 11:07 PM |
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quote:
Originally posted by JoelP
surely its easier just to get a full disc brake back end and use the bolt on shafts with the LSD?
I'm just being cheap but that's definately plan b.
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Flat Pack
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| posted on 16/1/06 at 11:38 PM |
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From what I understand, you can't remove the output flanges on a LSD and try to use the push in shafts directly, the LSD part means that you
need a longer input shaft on one side than the standard driveshafts have.
What you (possibly) can do is replace the CV joints at the differential end of your existing drive shafts with bolt on ones.
To be able to do this, you need to have the correct current driveshafts, they're from a 2.0l Sierra. If you don't know where your
driveshafts came from, I think your only option is to remove one CV joint and count the number of splines on the solid shaft part of the driveshaft,
this means cutting open a CV joint cover and you'll have to buy a service kit if you want to put it back together again. If they're 25
spline then you're in business, the bolt on joints will connect straight up to it and to your LSD. If they're 22 or less you need another
set of driveshafts, or go to a complete disk back end.
If you have got the right driveshafts and want to swap the LSD in, I've got a pair of bolt on CV joints spare (complete with backplates).
I'd very happily swap them for the internal bits of the tripode joints you'll have spare as they're exactly what I need!
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Jubal
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| posted on 17/1/06 at 08:25 AM |
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quote:
Originally posted by Flat Pack
From what I understand, you can't remove the output flanges on a LSD and try to use the push in shafts directly, the LSD part means that you
need a longer input shaft on one side than the standard driveshafts have.
What you (possibly) can do is replace the CV joints at the differential end of your existing drive shafts with bolt on ones.
To be able to do this, you need to have the correct current driveshafts, they're from a 2.0l Sierra. If you don't know where your
driveshafts came from, I think your only option is to remove one CV joint and count the number of splines on the solid shaft part of the driveshaft,
this means cutting open a CV joint cover and you'll have to buy a service kit if you want to put it back together again. If they're 25
spline then you're in business, the bolt on joints will connect straight up to it and to your LSD. If they're 22 or less you need another
set of driveshafts, or go to a complete disk back end.
If you have got the right driveshafts and want to swap the LSD in, I've got a pair of bolt on CV joints spare (complete with backplates).
I'd very happily swap them for the internal bits of the tripode joints you'll have spare as they're exactly what I need!
You are only round the corner from me as well, I'm near Knutsford. Thanks for the detailed response, I'll have a look at the splines and
let you know if the swap is on the cards.
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Jubal
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| posted on 18/1/06 at 09:27 PM |
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Just found this thread talking about different lengths now...
http://www.locostbuilders.co.uk/viewthread.php?fid=3&tid=9122
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Jubal
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| posted on 6/3/06 at 05:02 PM |
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Just to resurrect this thread. I think we're probably being numpties but we can't see how to remove the tripode end of the driveshaft to
replace it with the bolt on joint from the new shafts we have. I was expecting a clip to remove and we'd be in but there's no clip. Anyone
have any tips?
The alternative will be to buy new uprights and use the disk back end I now have but I'm trying to avoid spending any more money 
Grateful for any tips.
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Jubal
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| posted on 6/3/06 at 10:37 PM |
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You're all just being nice. It's all in Haynes, I should have looked before asking...sorry.
Now the trick will be doing it without knackering all my options...
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Jubal
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| posted on 8/3/06 at 08:30 PM |
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I'm having a chat with myself here but new uprights mean I can keep everything as standard and avoid hassle in the future so I've sent my
cheque to MK and eagerly await dispatch. Job done when fitted.
Thanks all.
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