Gears for tires
09-01-2010, 05:44 PM
#1
Senior Member
Thread Starter
Gears for tires
Alright i got a 96 f150 302 and i have a 3in body lift with Larado 33in A/T tires and i would like to get gears for the rear end what would u suggest 4.10's?
i would not be doing this at home i would prob take it to a shop to get it done cause i dont got a car lift and i have a rock driveway.
thanks james
i would not be doing this at home i would prob take it to a shop to get it done cause i dont got a car lift and i have a rock driveway.
thanks james
09-01-2010, 05:51 PM
#2
Sideways :-)
Several formulas can be used to find the proper ratio for your new tires. The easiest method is to use percentages. The new tires are some-percentage larger than the original tires that the truck came with. To compensate for the tires, the gears need to be that same percentage lower than the original gears. Simple. For example, if your truck came from the factory with 30-inch tires and 4.10 gears and you installed 33s, then you increased the tire size by ten percent. By increasing the original ratio by ten percent you find that 4.51 gears are needed. It can be figured out like this.
30-inch tire/100 percent = 33-inch tire/X percent
The 30-inch tires are the originals, so they are 100 percent. To find out what percent of the 30s the 33s are, we need to solve for the unknown, or X. To do this we need to multiply 100 by 33.
The result is 3,300. Then divide by 30.
3,300/30 = 110
So X equals 110. The 33s are 110 percent of the 30s, or 10 percent larger. To find the needed ratio, we can multiply 4.10 by 110 percent. Which equals 4.51. In most cases the exact ratio needed isn't available. However, something close will work fine. For this truck, 4.56 gears would be sufficient. Different axles have different ratios available for them. If the required gears come up in the middle of two available ones, then pick the lower gears (numerically higher) for more low-end. This can help compensate for wind and road resistance of the bigger tires.
http://www.4wheeloffroad.com/techart...ons/index.html
30-inch tire/100 percent = 33-inch tire/X percent
The 30-inch tires are the originals, so they are 100 percent. To find out what percent of the 30s the 33s are, we need to solve for the unknown, or X. To do this we need to multiply 100 by 33.
The result is 3,300. Then divide by 30.
3,300/30 = 110
So X equals 110. The 33s are 110 percent of the 30s, or 10 percent larger. To find the needed ratio, we can multiply 4.10 by 110 percent. Which equals 4.51. In most cases the exact ratio needed isn't available. However, something close will work fine. For this truck, 4.56 gears would be sufficient. Different axles have different ratios available for them. If the required gears come up in the middle of two available ones, then pick the lower gears (numerically higher) for more low-end. This can help compensate for wind and road resistance of the bigger tires.
http://www.4wheeloffroad.com/techart...ons/index.html
09-01-2010, 06:08 PM
#3
I agree with the 4.56's......This can be done in your driveway...no lift needed. However, if you're inexperienced, I'd definitely take it to a shop and have it done...but a reputable one....
