gears for 33 X 12.5s
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gears for 33 X 12.5s
im thinking about adding a 4 inch lift to my 94 pickup and wanted some insight as to what gears i should put in if i run 33 X 12.50s. should i replace them at all? they are 4.10s now.
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With a '94 don't assume you have 4.10 gears just yet. What is you're axle code? 4.88's are the way to go for 33s with a standard. If you have some local junk yards around see if you can find a Toyota set of 4.88 gears. '93-'95 3vze(V6) automatic trucks and 4runners came with 4.88 gears. I got a complete set for just $300.
Last edited by Bear80; 08-18-2007 at 10:17 PM.
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For me, 60 miles per hour is actually 59.41 so not exactly 60, but close.
heres the math, simple ratio: 4.10/28 = x/33 solve for x.
4.10*33=28x (33" is new tire, 28" is stock tire)
135.3=28x
x=4.8321 (equivalent gear ratio)
now to determine how far off the speedo is.
4.8321/4.88=x (to get percentage)
x=.99019
60*x = ? or
60*0.99019 = 59.4116
Now if my truck came stock with 31s, 4.88s would make my 60mph on the speedo equal 53.66, but it came with 28"s stock. Everything would depend on what was the stock setup.
heres the math, simple ratio: 4.10/28 = x/33 solve for x.
4.10*33=28x (33" is new tire, 28" is stock tire)
135.3=28x
x=4.8321 (equivalent gear ratio)
now to determine how far off the speedo is.
4.8321/4.88=x (to get percentage)
x=.99019
60*x = ? or
60*0.99019 = 59.4116
Now if my truck came stock with 31s, 4.88s would make my 60mph on the speedo equal 53.66, but it came with 28"s stock. Everything would depend on what was the stock setup.
Last edited by colsoncj; 08-20-2007 at 03:23 AM.
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Wow - a whole lot of calculations that are absolutely pointless because they assume the speedo is accurate from the factory - which in my experience, it's not.
If you REALLY want to know there are only two ways:
- time over distance with a stopwatch
- GPS (and even this may not be accurate enough)
We're really only talking about a few % here - you need a REALLY good measurement. Even police radar may be off by enough to not be used.
If you REALLY want to know there are only two ways:
- time over distance with a stopwatch
- GPS (and even this may not be accurate enough)
We're really only talking about a few % here - you need a REALLY good measurement. Even police radar may be off by enough to not be used.