greenwood03
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| posted on 15/12/09 at 11:40 PM |
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sierra 7inch diff 4.4
hi am after a 7inch sierra diff, looking for a ratio around 4.4, currently got a 3.92 lsd bolt on d/shaft fitted - looking for a sensibly priced
second hand unit - chrs mark
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mcerd1
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| posted on 16/12/09 at 12:44 AM |
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the only stock ones near that ratio are 7.5" diffs found in the 2l 8v & 16v ugly scorpios (4.1 and 4.44)
3.92 is the lowest stock ratio for a 7" diff
other than that your talking about an aftermarket crown wheel and pinion set - not common or cheap 
linky (I've lost the link to the
folk who actually make those)
[Edited on 16/12/09 by mcerd1]
[Edited on 16/12/09 by mcerd1]
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bj928
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| posted on 16/12/09 at 05:33 PM |
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not sure if the american solid 7.5 axle uses the same diff crown wheel and pinion as the british IRS 7.5 (granada/sierra) but here are some low ratios
and cheap.
4.56:1
http://cgi.ebay.com/ebaymotors/Richmond-6903201-Ring-and-Pinion-4-56-1-Ratio-Ford-7-5_W0QQcmdZViewItemQQhashZitem5ad5905040QQitemZ390130061376QQptZMot
orsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
4.10:1
http://cgi.ebay.com/ebaymotors/7-5-Ford-4-10-ring-pinion-gears_W0QQcmdZViewItemQQhashZitem35a5530afcQQitemZ230406949628QQptZRaceQ5fCarQ5fParts
they don't seem to do a 4.4:1
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greenwood03
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| posted on 16/12/09 at 10:24 PM |
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thx guys. I knew that 4.4 ( or thereabouts ) wouldnt come out of a standard sierra, just thought that perhaps by some miracle someone might have a
modded one lying around that they might want to sell. I dont know how easy/hard or possible it would be to swap out the 7 inch diff and replace with
the 7.5. given that i'm not mechanically minded and would need garage assistance - i'd suspect that any potential saving in going that
route would be offset by the labour costs. am not 100% convinced that i'll be able to live with that type of ratio on the road, hence would have
been ideal to find a direct replacement to try, if after a few runs its apparent that i cant live with it - pop the old one back in.......once again
thx
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mcerd1
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| posted on 17/12/09 at 10:16 AM |
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if the 7.5" diff will fit your chassis and youve got bolt-on driveshafts at the moment, then the 4.44 or 4.1 scorpio diffs would be amost a
strait swap (none are LSD as standard )
they have the same 100mm CV joints as the normal sierra bolt-on ones - so you can use the same driveshafts
and if you like the ratio you can build an LSD by swapping it into a cossie 2wd diff (the sierra ones have 108mm CV's, early granada cossies
have 100mm ones, but I think you can swap the flanges...)
the 7.5 is a bit bigger/wider - but lots of chassis are designed to fit either (don't know about yours though)
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greenwood03
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| posted on 17/12/09 at 10:46 PM |
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thx for this, seems a bit of research needed into whether it'd be easy to adapt, i dont know of any other owners that havem but then, i dont
know any other tigers that are wanting to run a 4.4!
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HOL
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| posted on 18/12/09 at 09:29 AM |
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Mark,
The 2wd Cosworth used a 7.5in diff case, unlike the 4x4 which used the 7in case.
As your car uses the whole sierra rear, you might be able to find a cage that you can bolt a 4.4 diff and the rest of your existing kit.
just a thought!
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mcerd1
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| posted on 18/12/09 at 09:52 AM |
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is yours one of those that uses the sierra beam to mount the diff ?
if it is you can get a 7.5" beam for a sierra fairly easily (as above the 2wd cossie's have them, but so do loads of later sierra's)
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