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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

radius arm difference

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Old Dec 30, 2020 | 03:19 PM
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From: gowen mi
radius arm difference

just got my radius arms from georgia, these are ibeam style, looks like measurements are the same however my 68 has ibeam style radius arms and wonder if i even needed to get new ones, is it possible my 68 radius arms would have worked with the 77 front end?

 
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Old Dec 30, 2020 | 03:35 PM
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I believe they would have, and I said so in your other post, but everybody seemed to ignore it.
 
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Old Dec 30, 2020 | 03:37 PM
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lol, i noticed but my radius arms were already on the way, thanks for the response, any idea what years the ibeam radius arms were made?
 
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Old Dec 30, 2020 | 04:08 PM
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Don't hold me to this, but I think they would fit from '65 to '79 (though there were some differences like cast vs stamped, holes for sway bar brackets, etc)

'80 - '96 also had twin i-beam suspension with similar radius arms, but the trucks were more narrow, hence the i-beams were shorter... I'm not sure if the radius arms were different or not.
 
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Old Dec 30, 2020 | 04:18 PM
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great info, thanks
 
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Old Dec 30, 2020 | 04:21 PM
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Do not use the two stamped arms on the left, those are ready for the scrap bin.
 
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Old Dec 30, 2020 | 04:26 PM
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for sure, those are the ones that came from the donor, i was happy with them until i pulled them off and saw the wear
 
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Old Dec 30, 2020 | 04:31 PM
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i had to torch one of the bolts off to remove the old radius arms, what is the correct replacement? the farms stores have different grades
 
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Old Dec 31, 2020 | 05:33 PM
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Go with the highest grade, better safe than sorry.
 
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Old Jan 2, 2021 | 07:02 PM
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You just proved me correct on what I posted on your other thread about the same front end pieces.
here is what I posted:

All years of Bumpside and 1973 F100/250 4X2 without stabilizer bar were the same.
1974 was different but was replaced by the 1975/77 F100/150 (and various F250s) ones. I believe as of 1974, they were just changed to stamped steel.
So the short answer is...yes. They should work.
 
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