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diff gears

Tech Talk for Cruiser owners.

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Joined: Sun Dec 27, 2009 10:46 am
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diff gears

Post by ChaChi »

hey guys new to the forum just have a few questions. ive bought a 60 series front diff to go into my 75 series ute once i do a spring over and i wanted to know how to find out what size diff gears it has in it so i can match it to the rear of my 75 diff which i also need to find out. any help would be great cheers chachi
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Re: diff gears

Post by MogLux »

Count the gears on the crown wheel and divid the pinion into the crown wheel for ratio...
Eg 39 teeth on a crown wheel and 9 on a pinion is
39 / 9 = 4.3333... ratio is 4.3...

If its still in the car jack it up and turn the wheel a full rotation and see how many times the tailshaft turns you can work it out pritty close like that too.
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Posts: 35
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Location: Sydney NSW

Re: diff gears

Post by ChaChi »

Wow thats simple haha thanks alot mate
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Re: diff gears

Post by sprungupcruiser »

Providing its a standard diff center it should be a 4.1:1 and should be the same as the rear of your 75. As far as I know all 75/60/40 series were the same ratio apart from the really old 40's which were 3.7:1 I think.
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Re: diff gears

Post by ChaChi »

ok thanks mate im gunna pull them both out and check anyway. dont wanna have everything binding on me
cheers for the help fellas
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Re: diff gears

Post by RED60 »

If you are going to pull the gears, once the centre is out, rotate the crownwheel look carefully and on the outer edge the ratio will be stamped...
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Re: diff gears

Post by MogLux »

RED60 wrote:If you are going to pull the gears, once the centre is out, rotate the crownwheel look carefully and on the outer edge the ratio will be stamped...
Only if there still factory gears... havent seen an after market set with them stamped into it for a long time...
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Re: diff gears

Post by 91Mav »

macarthur 4x4 wrote:Only if there still factory gears... havent seen an after market set with them stamped into it for a long time...
My Nitro's and Yukon are all stamped.
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Re: diff gears

Post by MogLux »

91Mav wrote:
macarthur 4x4 wrote:Only if there still factory gears... havent seen an after market set with them stamped into it for a long time...
My Nitro's and Yukon are all stamped.
OK my nitro's were never stamped...
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Re: diff gears

Post by 91Mav »

Different batches maybe?
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