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Joined: Fri Nov 29, 2019 12:35 pm
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Vehicle: h20 vitara sv620

Post Posted: Fri Nov 29, 2019 12:47 pm 
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HI Guys i have a Sv620 h20a 97 manual vitara and ive blow my front diff (casing cracked while doing some serious offroad action) ive been told they run a 4.625 ratio and i can only find a 4.8 second hand is it as easy as just changing front and back diffs with new ratio they are out of a sv420 ? or is there more too it. I have 32inch tyres on it which im guessing is part of the problem why i blew the diff in the first place. Thanks


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Joined: Tue Apr 20, 2010 12:00 am
Posts: 2115
Location: Georgetown, Guyana
Vehicle: 98 5 dr SQ420, 05 5dr JB420

Post Posted: Fri Nov 29, 2019 9:50 pm 
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Since the 4.8s are from another SV series, it should be a simple bolt in swap.

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Joined: Thu Feb 26, 2009 11:00 pm
Posts: 11309
Location: Melbourne

Post Posted: Sat Nov 30, 2019 8:38 am 
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With 32"tyres you need to swap to 5.12 ratios from a 1.6 manual or 4 speed auto vitara. 4.88 will still be far too tall. Fortunately these are are the easiest ratios to find.

To try and make the front end reliable with a 32" tyre, you need to consider the full suite of Vitara front upgrades - steel case from a manual V6 GV, steel diff carrier, 26 spline axles if your model doesn't already have them, and a bush supported driver's side axleshaft, which will be a cut down and resplined passenger side shaft, and diff drop brackets.

CV's will still be a weak point, but they're quite quick to change trailside once the RHS and LHS CV's are the same.

here's all the upgraded parts laid out. (steel diff carrier is out of frame)

Image

I was involved in the build of a few Vitaras over the years running 32"+ tyres. The formula to maximise strength and reliability is a good one. They're still not trouble free, but they're pretty good.

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