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Old 09-28-2006, 11:25 PM   #1
72shadetree
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rear axle help

71 3/4 ton with the eaton rearend.
will a 14 bolt ff bolt in with no mods. if so what do i need to get it from.
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Old 09-29-2006, 08:10 AM   #2
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Re: rear axle help

I`d like to know,too.I`m not sure if the spread on the spring pads is the same or if the driveshaft length and u-joints are the same.As far as what it`s out of,they`re all the same`73-up.But,the 4wds are narrower between the springs and`88-ups have a wider spread there on both 2wd and 4wd.
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Old 09-29-2006, 10:06 AM   #3
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Re: rear axle help

You'll have to relocate the spring perches and you may have to engineer some e-brake stuff. Drive shaft should be fine.
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Old 09-29-2006, 12:11 PM   #4
Yukon Jack
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Re: rear axle help

The 14 bolt ff from a 1 ton will have the correct spring perch placement for a 67-72 4wd. The driveshaft will require a conversion u-joint. I can't help on the driveshaft lenght issue. The hard brake line terminates in a different location so you will have to modify that some. Shock tabs may have to be relocated.
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Last edited by Yukon Jack; 09-29-2006 at 12:12 PM.
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Old 09-30-2006, 12:06 AM   #5
72shadetree
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Re: rear axle help

thanks
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