C4RL0
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Registered: 30th Sep 06
Location: Cumbria
User status: Offline
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Now then, your always going to go through tyres like a fat kid through cake if your forcing nearly 300bhp through the front wheels. And equal length shafts just can't give you the grip by themselves, so next on the shopping list is a diff.
So I'm looking at getting a diff so that every time I go out I don't have to bend over and let KwikFit rape my ass because my tyres are bold  But which one is best? Some people say the ATB LSD? Or the trans-x Plate type diff? It will be fitted into me mechanical f28 which has been converted to 2-wheel drive.
I need to know the pro's and con's of them please. And does anyone know if the f20 diff is the same as the 2wd f28 diff?
Any info would be great 
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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http://www.migweb.co.uk/forums/showthread.php?t=301357
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C4RL0
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Registered: 30th Sep 06
Location: Cumbria
User status: Offline
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so all you need to fit an f20 diff into an f28 box is a sleeve like spacer. But which diff do i get? It will be used on the road the majority of the time.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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I've got a TranX plate diff (45/90) - very good.
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C4RL0
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Registered: 30th Sep 06
Location: Cumbria
User status: Offline
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another thing i forgot to ask, what does this 45/90 mean. I know you can adjust it, but what is it?
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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ramp angle / locking rate.
for road you'd prob want a low rate, but gravel a high one
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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see here for F20 diff's
http://www.tran-x.com/DiffsHTML/GMAstra.html
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C4RL0
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Registered: 30th Sep 06
Location: Cumbria
User status: Offline
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So i'll be wanting a low rate as it will be only on tarmac. So what's the pre-load numbers mean?
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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how much torque? i think is required to lock the diff... not too sure
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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How does limited slip work?
Clutch packs inside the differential create additional resistance. This resistance is always present. It is called preload. So, whenever one side wants to start rotating faster than the other, this resistance (preload), in addition to the traction present at the wheel has to be overcome before a tire can spin.
Traction and preload have to be high enough to keep tires from spinning but low enough to still allow tires to rotate at different speeds in a turn. Since the preload has to be kept low enough to allow safe cornering the slowing effect on wheels that want to spin is marginal. It works in easy off-road conditions and on mildly slippery roads. For serious off-road use and very slippery roads (snow, ice) limited slip is not powerful enough.
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C4RL0
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Registered: 30th Sep 06
Location: Cumbria
User status: Offline
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AK
Anyone else want to add?
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