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ZUKIWORLD Discussion Forum => Technical Discussion - Performance / Modify => Topic started by: one mile on October 12, 2010, 08:28:54 PM

Title: 5:12's Too Low?
Post by: one mile on October 12, 2010, 08:28:54 PM

On a stock Samurai with 30"tall tires steet driven 90% of the time are 5:12's O.K.?

Title: Re: 5:12's Too Low?
Post by: my996duc1 on October 12, 2010, 09:03:00 PM

it should work but if you can go t-case and ring & pinion gears you will get a better combo.

My '87 had 5.12 gears and stock t-case with 31" tires for awhile.
I was turning 4200rpm at 65mph with a low range crawl ratio of 42:1
This had my speedo off by about 10mph and the odo was off too.

Now I am running 4.30 gears and a 6.4 t-case with 31" tires.
I am turning 4100rpm at 65mph with a low range crawl ratio of 100:1
Speedo / Odo are almost spot on.

Here is a good calculator for figuring speed/rpm/crawl ratio/ ect....
Keep in mind that your tires may not be the size advertised on the sidewall.
http://www.grimmjeeper.com/gears.html (http://www.grimmjeeper.com/gears.html)

Title: Re: 5:12's Too Low?
Post by: wildgoody on October 13, 2010, 08:28:09 AM

That's a great calculator, gives you 2 screens to play with #s and look at results side by side