Hello, all. My first post.

I'm sure this has been asked many times. I have a 2004 Vitara V6 automatic. It is my daily driver. I do not do any off-roading, and only use the 4WD as an assist on snowy roads. The ZUKIWORLD site says my Vitara has a 4.875 axle ratio. My calculations, based my tire diameter and tach, comes out more like 5.52. I would like to go to a higher ratio for gas mileage. I'm willing to accept the performance hit. What are my options? How hard is it to re-calibrate the speedo?

This car screams on the highway at 75 mph!

ZUKIWORLD says the Vitara with manual has a 4.3 gearset. Would this work?

I thought of larger tires, but I don't think a tire much larger would fit without (expensive) suspension mods.

Thanks in advance for your help.

By the way, the spell-checker does not like "Vitara!"

well If your under 4000 rpm's that not really screeming for that motor I wouldn't worry about changing the axle ratio, it's not a big block Chevy  My Mom had a 99 4runner that was 4cly 5speed and |removethispart|@ 70 it was about 3900rpm. It's an import thing


Ryan 

x2 on what ryan says.

Check out this gear calculator:

http://www.acksfaq.com/gearcalc_frm_generic.html

Plug in the values - including your REAL tire diameter (go out and measure it!) and see what you get.  You should be able to find the transfer case and transmission ratios in your owner's manual or from the dealer's service department.

Remember, these engines tend to get most of their power at RPMs over 3000 on the highway.

I switched from stock Samurai 3.73 ring and pinions to 4.62s (from an automatic Tracker) with terriffic mileage results on 30" BFG ATs.

You may be faced with the difficulty of findiing suitable R&P gearsets (aftermarket or otherwise) as your truck is so new.

A speedometer shop should be able to recalibrate your speedo.  You can also use a GPS unit to replace the speedo.

I hope that this helps!