A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
There are 2 aspects to fitting a lobster box or other modified transfer case. The first is to correct the high range for bigger tyres for road use. The second is to make the low range much lower for technical off-road use, e.g. a crawler box. You can do lots with standard parts to correct the overall ratio for bigger tyres, but there are very few options when it comes to making low range lower relative to high range.
I have a 2006 jimny, and changed the transfer box to a manual one. Top speed if I'm lucky is 55/60 mph at 4000rpm running 215/75/15 tyres. What would be recommended to lower the rpm?
It's a 30% difference. You'd need to fit 34" tyres to get back to standard ratios. Or fit the earlier type gearbox and you will be just 10% out front standard, which is a reasonable compromise on 215/75s. And you then have the more reliable gearbox.
True Busta.
And there is room for larger tires later as well. I got the 17% reduction in the transfer box and with the 235's and 1.6 engine it is plenty low enough. Considering the extra noise from the gears I would change it back to original if I where to dive into the transfer box again. But then again I now have room for 30" or even 31" in the gears.
(Not in the fenders but that is an angle grinder job.)
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