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Old 04-15-2002, 02:34 PM   #1 (permalink)
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ford leafs

OK ford gurus, lets talk leaf springs. Are there differences in f-150 vs full size bronco leafs? How about pre-'79 vs '80 and above? The mags list lifts for fords and the split seems to be 1979 and 1980. What is different about them? More specifically, will 1977 f-150 leafs fit say a 1983 bronco?

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Old 04-15-2002, 07:03 PM   #2 (permalink)
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There were a bunch of different packs made depending on the weight rating. IIRC, some of the F100's came with a 2-1/2 (?) pack, but aside from that, they're all the same length and offset.

I'm not sure if they changed in the '70s, but I know that a '78 pack is interchangable with a '94.
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Old 04-16-2002, 04:22 AM   #3 (permalink)
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Quote:
Originally posted by sclemons


I'm not sure if they changed in the '70s, but I know that a '78 pack is interchangable with a '94.
Is this true when swapping from bronco to F-150? As far as length? I can take f-150 leafs and putt hem on a FS bronco?

Thanks for the help.
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Old 04-16-2002, 06:53 AM   #4 (permalink)
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It should be.... unless the F-150 packs were the 2-1/2" ones. They're all the same length aside from that.
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Old 04-16-2002, 07:34 AM   #5 (permalink)
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Not exactly on topic but sorta

What are the differences of a 2.5" vs 3" aside from the obvious 1/2". Is there any gains from a 3" pack? I am getting ready to swap out my 9" for a D60 and am curious if there is any need to move up to a 3" leaf or if the 2.5" is good enough? This is in a 2dr Explorer using 4dr leafs for info purposes. Any help would be appreciated.
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Old 04-16-2002, 08:59 AM   #6 (permalink)
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I would say the 3" springs are beefier. EB's have 2.5" springs and I have seen lots of D60's used there. So I think you should be all right wityh the 2.5's. I want to use the 3" springs becuase they are longer and are offset so increasing WB is easier on my EB. As far as spring rate differences I am not sure.
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Old 04-16-2002, 12:35 PM   #7 (permalink)
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IIRC my research in a local yard indicated all 3" leafs are the same length from Bronco thru F350, and have the same center pin offset (about 6" forward I think?) at least for '80+. I found quite a few '80-86 F150s that used 2.5 (or I'm thinking it was even 2.25") wide leafs. I never measured them 'cause it wasn't what I needed. FWIW.

While I'm fairly certain pre '80 stuff is the same length as well I can't say for certain.
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Old 04-16-2002, 01:12 PM   #8 (permalink)
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Everything else being the same (no. leaves, thickness of each leaf, center offset, leaf lengths, etc etc), a 2-1/2" pack will have a lower spring rate. There's just less steel there.

A lot of folks claim that the 2-1/2" stuff flexes better. It makes sense... less steel across the rotational moment of the spring, the spring should twist more easily. But all the other differences from one pack to the next make it a little hard to say that "all" 2-1/2" stuff will flex better.
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Old 04-16-2002, 04:50 PM   #9 (permalink)
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This is good info. Can anyone confirm the differences/similarities between 70's and 80's. "D60" says all 3" 80's springs are the same. How about 70's?
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Old 04-16-2002, 09:40 PM   #10 (permalink)
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Quote:
Originally posted by clc900
"D60" says all 3" 80's springs are the same. How about 70's?
I know what you mean, but to clarify: same length of main leaf from eye to eye and same center pin offset.

To add I'd actually strive for packs from an F250 or 350, the more leafs the better 'cause then you have more flexibility to mix and match (provided each individual leaf isn't too thick-much over 1/4" is too much for a good ride and good flex IMO). I got a 7-leaf pack from '83 F250 oil-burner, put the 2nd to longest leaf in my stock rear Bronco pack as an add-a-leaf, then used one of the others as part of my SAS up front. But do look around, some packs are tapered and/or fitted w/anti-friction pads (if you care), while others are straight cut.

Note that many F250s will simply have a 5-leaf pack just like Broncos and F150s, the only difference is a thicker overload at the very bottom of the pack.

If you get to the real HD stuff all bets are off. I found an '80ish *something* that had been a cab&chassis or box van or something.... the leafs were the right length but they were 2.5/2.25" wide and it was a 10 leaf pack! FWIW.

Sorry still can't help you on '70s stuff, just throwing out suggestions. If you've got a yard where you can pull leaf packs cheap I'd get several, you can never have too many IMO to mix and match as I said.
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