Re-gearing to 4.30 ratio?

TNos54

 
Joined
Feb 8, 2007
Messages
12
Location
Denver, CO
I've been spending some time researching a re-gear for my 08 6MT. The stock 3.91 gears have been ok, but the truck really struggles in the mountains when fully loaded and my fj is pretty heavy with front and rear bumpers. I'm not planning on going bigger than 33" tires, so going with 4.56s seems like it might be too low. While researching I saw that Nitro offers a 4.30 ratio for the FJ and I was curious if anyone was running that? In my research I could only find people running 4.56s or 4.88s once they switched to 34" or 35" tires. I used this calculator to compare 4.30s (Left) with 4.56s (Right) with 285/70/R17 tires and got the following numbers.

1919385


Would going with 4.30s be a good idea?
 

BMThiker

I aim to misbehave
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SILVER Star
 
Joined
Sep 19, 2006
Messages
9,098
Location
Atlanta
If you are only going up "2 tire sizes" (265-->275-->285), seems like the 4.30 gear package would be a reasonable option. What do the numbers on the left look like compared to completely stock options now? I'd be interested to see how similar the final drive ratios look.
 

TNos54

 
Joined
Feb 8, 2007
Messages
12
Location
Denver, CO
4.30 on left and factory stock tires/gears on the right
1919711


Final drive ratios. 4.30 on the left vs stock
1919712

and 4.30 vs 4.56
1919713
 
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