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Old 06-04-2006, 06:57 PM   #1 (permalink)
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Question corperate 10 bolt ratio

how do i figure out what gear ratio i have in my axles? it is a 3/4 ton with a th350 and np 208 the rear axle is a corperate 10 bolt.
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Old 06-04-2006, 07:06 PM   #2 (permalink)
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pull the cover

count teeth and divide them
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Old 06-04-2006, 07:11 PM   #3 (permalink)
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3/4 tons never came with 10 bolts from the factory. either it's not a 3/4 ton, it's a not a ten bolt or your axle has been swapped.

jack up one rear tire, spin it around twice. count how many times the driveshaft turns. that's your ratio.
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Old 06-04-2006, 08:19 PM   #4 (permalink)
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Quote:
Originally Posted by OffRoad
3/4 tons never came with 10 bolts from the factory. either it's not a 3/4 ton, it's a not a ten bolt or your axle has been swapped.
They only came in the front, not the rear

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Old 06-06-2006, 05:08 PM   #5 (permalink)
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my bad

i apologize, i have a 14 bolt in the rear and a 10 bolt in the front. is there a site or something i can type in the V.I.N #?
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Old 06-06-2006, 06:47 PM   #6 (permalink)
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not realy.

first look for a ratio tag on the bolts for the cover, its about 1"x1.5", it will have the teeth count and ratio. do the same for the front cause the axles probaly match.

or pull the cover of and count the teeth around the ring and then pull the pinion and count those teeth, divide ring teeth x pinion teeth = ratio

there are only a few rations avalible

3.54
3.73
4.10
4.56
maybe 4.88
5.13
maybe 5.38

it will be very obvius if you have 4.10 or ### higher you wont go very fast but the truck will jump on it.
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