BigWig
Posted a lot
Posts: 1,101
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Sept 6, 2005 14:03:04 GMT
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Not for me, my mate asked whether a 2wd cossy diff can be fitted to a base model Sierra? Good idea I thought I told him it probably would, just want to confirm though!
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Sept 6, 2005 14:54:53 GMT
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The half shafts just bolt on to the diff on those so as long as its no wider which I don't think it is there shouldnt be a problem. If he hasnt already got the diff a cheaper option is the LSD from an XR4 or XR4x4 as these definetely do fit and there are a lot more around.
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Kris
Posted a lot
Posts: 1,631
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Sept 6, 2005 15:26:24 GMT
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I think the lesser spec cars have push-in type shafts and the 2WD Cosworth has a 7.5" diff and 108mm PCD bolt-on shaft set-up wheras the 4X4 Cosworth has 100mm PCD shafts on a 7" diff. It can be done but its not easy on the lesser spec models. A friend of mine put an XR4X4 LSD into his '92 Sierra LX that has rear drums fitted and spent a whole day doing it in a fully kitted out workshop. To fit an LSD you will have to convert to bolt on 'lobro' jointed shafts with the correct bolt PCD from a disc braked car, easier if you get the whole rear beam of the Cosworth with the bolted shaft bearing carriers and stub shafts. The bearing carrier will need to be modified as it is too big for the drum set-up and the retaining bolts will need the heads machined down to clear the brake shoe mechanism. Don't forget that the speedo will read out, to work out the % error use: (new ratio-old ratio)/old ratio x 100 Alot of work but well worth it in the end ;D IIRC the "Cosworth 4x4" diff is the same as the XR4x4 diff but 10 times the price just because of what it came off!!
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MWF
Posted a lot
Posts: 2,945
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Sept 6, 2005 15:43:37 GMT
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The easiest way to convert to LSD is to swap the entire back axle over from a Sierra of the same age. The Mk1's had a more narrow ARB which doesn't match up. This often gives you rear disks instead of drums too. So on a later Sierra its worth finding a 2.9 XR4x4 and taking the whole lot off.
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Kris
Posted a lot
Posts: 1,631
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Sept 6, 2005 15:52:07 GMT
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That would be the easier option, I like to make things difficult for myself ;D, however... This often gives you rear disks instead of drums too. ... you'll require the correct brake master cylinder for the all-round disc setup.
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MWF
Posted a lot
Posts: 2,945
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Sept 6, 2005 16:04:54 GMT
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Is that so, I am planning to do this conversion myself on my 4i so that's handy to know.
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Kris
Posted a lot
Posts: 1,631
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Sept 6, 2005 16:24:49 GMT
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I'm thinking that you will need the Sierra "all-disc" larger bore master cylinder, servo and brake proportioning valve as the rear calipers will require a greater volume of fluid than the original cylinders for the same amount of braking effort.
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BigWig
Posted a lot
Posts: 1,101
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Sept 6, 2005 16:51:46 GMT
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Ok cheers boys. Did the sierra gt have discs fitted at ze rear?
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Kris
Posted a lot
Posts: 1,631
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Sept 6, 2005 17:32:40 GMT
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I think the GT was a tarted up 2.0 DOHC, as they were trying to shift them quickly before the Mondeo came out, so I guess they have drums at the rear.
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Nick
Posted a lot
Posts: 2,483
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Sept 6, 2005 18:30:38 GMT
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LSD...pussy. weld up the open diff haha.
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idea stolen from rattely eddie.
this weeks car count "5"
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antdat
Part of things
Posts: 712
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i did this with my old serria we a great conversion helped loads in bad weather, I did as people have suggested swapped the full rear over much easier
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I think the GT was a tarted up 2.0 DOHC, as they were trying to shift them quickly before the Mondeo came out, so I guess they have drums at the rear. All the injected DOHC's (including the GT) had rear discs. They also had a lower diff ratio (3.92:1 instead of 3.62:1). The Cossie and XR4i had 3.62:1.
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Last Edit: Sept 7, 2005 8:50:47 GMT by moggyman
1953 Minor (Long term project) PT Cruiser
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BigWig
Posted a lot
Posts: 1,101
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Sept 7, 2005 10:26:42 GMT
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Welding the diff would be a menace ;D So basically if he had a GT, he'd already have a good head start, larger master cylinder etc etc? Can't help but think a dohc sierra with a slipper would make a top drift car! I know it hasn't got 300bhp but all the same, it would be a good fun car
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Last Edit: Sept 7, 2005 10:43:30 GMT by BigWig
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Kris
Posted a lot
Posts: 1,631
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Sept 7, 2005 13:59:29 GMT
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All the injected DOHC's (including the GT) had rear discs. They also had a lower diff ratio (3.92:1 instead of 3.62:1). The Cossie and XR4i had 3.62:1. Not all DOHCs have rear discs, only the higher spec ABS equipped cars do such as the 2.0 XR4x4, the lesser spec cars made do with drums. Some DOHCs are also fitted with a 3.62 diff. I have this on good authority from a Sierra owning friend who has a scary amount of technical knowledge on them It's a great conversion, even with the 2.0 it's still great fun. Some pics from my friend's conversion... The "new" LSD... Rebuilding the shafts... Fully rebuilt LSD, even the case was bead blasted... He also runs it pretty low on Sachs Motorsport dampers... He also has a matching red 2.9 GLSi 4x4, "Surely it can`t get stuck, it's got four wheel drive..." ;D
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