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Old 11-27-2019, 10:02 AM   #1 (permalink)
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Critique my 3-link numbers

Im all set to burn this front 3-link in, would love some insight on if i need to change something. Thanks! 1981 j-20, belly at 23.5, 5in up, 9in down travel currently.





Bump


Ride Height
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[QUOTE]Originally Posted by [B]Muddin [/B]

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Last edited by j20brett; 11-27-2019 at 10:06 AM. Reason: Gigantic pics
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Old 11-28-2019, 09:55 AM   #2 (permalink)
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Which program is this? Looks nicer than the one I’m using. Your CG looks way too high, I measured mine recently and it was 34.7”.
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Old 11-28-2019, 11:40 AM   #3 (permalink)
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Interested in the program as well. Any reason not to extend the track bar further out on the axle?
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Last edited by mouse; 11-28-2019 at 11:44 AM.
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Old 11-28-2019, 11:41 AM   #4 (permalink)
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is your tie rod going to clear your panhard upper mount if you steer full left/right while at full bump?

If you can, is there space to move the panhard upper closer to the axle?
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Old 11-29-2019, 08:02 PM   #5 (permalink)
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Quote:
Originally Posted by Greg S View Post
Which program is this?
This is the most recently updated spreadsheet calculator.

pirate4x4.com/forum/general-4x4-discussion/204893-new-version-my-4-link-analyzer-request-help-17.html#post38104162

I noticed something seems off about the front pinion angle calculation. The rear link geometry seems to affect the front pinion angle. I think this is a bug and I sent a PM to Bush65, but its been a few years since he updated it so who knows if hes still around.

I agree the CG seems high. I found a paper about finding the CG of a few stock trucks and they found an F150 to be about 27 or 28 inches.

deepblue.lib.umich.edu/bitstream/handle/2027.42/913/80554.0001.001.pdf?sequence=2

Obviously a lifted truck will have a lifted CG, but that paper gives you a starting point. Because the unsprung weight is not lifted, the CG will raise by less than the lift amount. Larger tires will lift both sprung and unsprung weight, however.

Last edited by ajm8127; 11-29-2019 at 08:06 PM.
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Old 12-02-2019, 06:32 AM   #6 (permalink)
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Quote:
Originally Posted by Provience View Post
is your tie rod going to clear your panhard upper mount if you steer full left/right while at full bump?

If you can, is there space to move the panhard upper closer to the axle?
It wont right now, but i plan to trim off the lower bolt hole from the upper and lower panhard mount. I had to move the upper mount out to clear the diff at bump.

I may be able to move the axle panhard mount out to the inner c and attach the ram off of it. Thats whats limiting its location currently.

I didnt calculate the CG height per se, just used the top bell housing bolt as a reference. Ill see what it takes to calc it out.
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[QUOTE]Originally Posted by [B]Muddin [/B]

It wasn't a little "achoo". It was "achsshemmiddtpppthpphphphphtsmmmppp...spray".[/QUOTE]
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Old 12-02-2019, 08:41 AM   #7 (permalink)
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I would look for a straight pitman arm and move the track bar and drag ling up a bit. I might be concerned about how far that track bar brackets sits out side the frame if you are going to mount the shock/strut above the axle.

If you can raise the frame side link mounts up.
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Old 12-02-2019, 11:54 AM   #8 (permalink)
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I'd rock it, I would definitely try and get a longer track bar though (Or at least the same length as the drag link). Don't see any reason that mount couldn't be at the C.
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Old 12-03-2019, 07:53 AM   #9 (permalink)
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The drag link is 36.5", panhard is 34.25" right now.

I could move the panhard out to the knuckle, which is about 6" more. Would that not result in more bumpsteer?
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[QUOTE]Originally Posted by [B]Muddin [/B]

It wasn't a little "achoo". It was "achsshemmiddtpppthpphphphphtsmmmppp...spray".[/QUOTE]
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