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Blitz diffs ,with late model internals and brakes ,Gwagensteve wrote:Sailsbury rear and the right combination of front parts that mimic an FC101 will allow a 38"tyre to be certed.
FC101's ran 9.00X16 tyres stock - that's 36"
I'm unsure if it's possible to run the same front hub arrangement on a Range rover style housing. If it is, it might be possible to cert 38's on a housing that's about the same size (and weight) as hilux. Using a series III rear sailsbury might make the width and offset about right and runs 4.7 diff gears.
38's have been certed on landrovers, there's no real reason why with the same parts under a sierra that it's not possible on a sierra either.
There's lots of other issues - brake efficiency, overall height, and the weight of the axles, so it's not an easy path, but that doesn't mean it's impossible.
That might be not worth the effort for the small gain - 34's a pretty easy using 60 series or patrol diffs, but if you really want over 34" legally, it might be possible.
As an aside, it might not be possible to cert over a 34" tyre using Dana 60 diffs - the tallest stock tyre I've been able to find on a D60 is a 7.50 16 on chevy pickups.
D70's, which are REALLY big and heavy, can be legal with up to at least a 39" tyre - some pretty big tyres were certed on OKA's, but that's way too much diff for a sierra.
Portals are another way of certing big tyres, but once you add the height of the portal box plus the tyre height "lift" - it's impossible to stay within the 150mm maximum lift height under the NCOP.
Steve.
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