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Old 10-15-2012, 07:16 PM   #1
Budman56
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Rear differential question

I need to know what year chevy truck would have had a posi differential in it? 5 lug with 373 gears any one know?
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Old 10-15-2012, 07:58 PM   #2
100%Chevy
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Re: Rear differential question

My 68 has the 373 posi from the factory.
Oops,mine is 6 lug!
Mike.
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Old 10-15-2012, 11:14 PM   #3
kenbob87
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Re: Rear differential question

i know my step dads 73 suburban had posi not sure on the gears though, but i know our 89 sub had 3.73 posi i dont know if that helps you at all but i figured i would give my 2 cents
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Old 10-16-2012, 12:50 AM   #4
Captainfab
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Re: Rear differential question

There isn't any specific year or model of truck that will definitely have 3.73's and a posi. It just depends on what options a truck was ordered with. It's just a matter of searching and either checking build code stampings or pulling covers.
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Old 10-16-2012, 07:57 AM   #5
m455sx
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Re: Rear differential question

5 lugs were usually 2wd trucks 71 and newer. Look for factory towing package as most of them were 373.
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