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Old 08-15-2012, 10:07 PM   #1
hula
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Is it ok if front and rear gear ratios are different?

I have a 1969 K20 4x4 I just changed the rear gears to 3:73 and the fronts have the old 4:56s. Does this mean I can't use the 4 WD with different ratios?
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Old 08-15-2012, 10:15 PM   #2
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Re: Is it ok if front and rear gear ratios are different?

Correct don't use the 4wd untill you get matchng gear ratios.
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Old 08-15-2012, 10:57 PM   #3
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Re: Is it ok if front and rear gear ratios are different?

You will have some serious problems if your front/rear ratios are different and you engage 4WD.
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Old 08-16-2012, 12:45 AM   #4
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Re: Is it ok if front and rear gear ratios are different?

Those serious problems would include severe binding at the very least, and major parts breakage is a very real possibility. It would be undriveable.
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Old 08-16-2012, 12:55 AM   #5
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Re: Is it ok if front and rear gear ratios are different?

You could go with different size tires front and rear. You would have to compute the circumference that would work with the different ratios. I don't know how to do this though. Otherwise don't use 4 wheel drive.
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Old 08-16-2012, 12:57 AM   #6
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Re: Is it ok if front and rear gear ratios are different?

Breaking stuff may be the least of your worries. You will lose control and possibly wreck, hopefully just the truck and not you or someone else.
Change the front when you can. In the meantime don't use 4wd. You may want to pull the front drive shaft just to be safe.
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Old 08-17-2012, 02:23 PM   #7
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Re: Is it ok if front and rear gear ratios are different?

What I thought. Front gears are next..

Thanks
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Old 08-18-2012, 05:17 PM   #8
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Re: Is it ok if front and rear gear ratios are different?

I think if you use 38 inch tires on the 3.73 axle, and 31 inch tires on the 4.56 axle you'd be okay
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Old 08-18-2012, 09:31 PM   #9
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Re: Is it ok if front and rear gear ratios are different?

^^^hahaha! maybe 38''s on the front but would that ever look dumb
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