Compression and Droop Talk - JeepForum.com

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post #1 of 19 Old 01-06-2014, 12:39 PM Thread Starter
flipit
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Compression and Droop Talk

The main reason I am starting this is for compression,
but I figure droop is good to keep in case anyone is looking,

So what happened here is I was thinking about everything I'll list,
and I got some ideas, but seeing how I've not done anything, thought I might be able to get some intelligent insight.

Where I'm at, I have new to me axles strapped up under the Jeep,
and now It's time for all the final touches- pinion angle, shock and brake length,
and for those who do the gas tank mod I figure that should fit in the conversation as well.

I read through http://www.jeepforum.com/forum/f12/w...droop-1804905/ while Googling to see if I could find the answers I was looking for.

So after all that blabbing, the core of the question.
How can I, or anyone check the max droop and compression for six parts,
the four corners and the two axle centers?

some situations specific to me...
I don't have a forklift,
I haven't found a small ditch or ramp in the near vicinity where my Jeep can currently get to.

The ideas I have had I think are good,
but I have sometimes done some things that some people might call "questionable" or "downright stupid"
so here goes nothin'!

So I've been planning on pulling off my body, for other reasons,
and I was thinking,
what if I ratchet strap the axle to the frame on both sides,
and just crank on it until it doesn't move any more?
Is that a good way to get full center compression?
I figure full center compression will be good to see if the axle can contact the gas tank,
and also see the max compression driveline angle.
then I lift the entire rear end,
and let off the ratchet straps on each side and both sides for full droop.
doing each side will give me my shock and brake line lengths,
and all that can be done in a garage yeah?

so how crazy is my idea?
and what does everyone else do?


Project #1- http://www.jeepforum.com/forum/f12/5-0-yj-right-way-1799609/
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post #2 of 19 Old 01-06-2014, 01:18 PM
yjcrawlr
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How you said you come up with some crazy stupid ideas this is one of those times. The ratchet strap idea is a bad one. Simply find a place to drive and flex your jeep out.

90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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post #3 of 19 Old 01-06-2014, 01:43 PM Thread Starter
flipit
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I figured the would be the case,
but okay, so the flexing is good for shocks and brakes,
but how can I compress my full rear axle and check the driveshaft and pinion?

Project #1- http://www.jeepforum.com/forum/f12/5-0-yj-right-way-1799609/
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post #4 of 19 Old 01-06-2014, 02:04 PM
yjcrawlr
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Set you pinion and drive shaft up with your jeep on level ground and with its normal weight in it.

90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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post #5 of 19 Old 01-06-2014, 02:14 PM Thread Starter
flipit
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yeah, that will get the angle right for welding the perches on,
okay, maybe I'm missing a part here.
okay, so you set it at the weight and you weld it,
so lets say its pointing at a 45* angle just for arguments sake,
I have the stock bump stops to keep it from going too far,
but nothing else is stock any more,
so I need to compress it to see where I need to stop it now right?
and if I put any rear stretch on it,
I need to compress it to see if I clip the gas tank skid or not true?
so how does one go about compressing an axle?

Project #1- http://www.jeepforum.com/forum/f12/5-0-yj-right-way-1799609/
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post #6 of 19 Old 01-06-2014, 02:24 PM
jsawduste
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I`ve done this a number of times.

Nothing wrong with using the wider ratchet straps for cycling the suspension. A bit of planning where your going to place the strap and remember the kinetic energy stored when tightened down.
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post #7 of 19 Old 01-06-2014, 02:32 PM
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If you find yourself near my shop in Ripon, you're welcome to use my forklift. Jam86 has one at work in Byron if you need one closer. I'm sure you could find a local farmer with a loader and ask to borrow it for a few minutes to check.

Just throwing it out there.

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post #8 of 19 Old 01-06-2014, 02:36 PM Thread Starter
flipit
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I got some pretty heavy duty ones I think will hold.
any key spots to place the strap?
and did you fill the bed with some weight to push it down as far as you could then ratchet it the rest of the way?

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post #9 of 19 Old 01-06-2014, 02:48 PM Thread Starter
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Quote:
Originally Posted by Anticanman View Post
If you find yourself near my shop in Ripon, you're welcome to use my forklift. Jam86 has one at work in Byron if you need one closer. I'm sure you could find a local farmer with a loader and ask to borrow it for a few minutes to check.

Just throwing it out there.
Thanks Nick, I appreciate it. Unfortunately Ripon is a bit far without brakes and shocks :P
Jam86 might be a good person to talk to, I had no idea there was another JF member in this tiny town.
I think that last one might be perfect, I got a farmer across the street that's real friendly.

I was thinking about just using a cherry picker on the tire,
but if I can get a forklift conveniently,
that might be the better way to do it.

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post #10 of 19 Old 01-06-2014, 04:09 PM
jsawduste
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If you have a trailer then simply load the jeep up and ratchet off the frame to the trailer tie downs.

While trailering that is how I tie my junk down. Chain and chain binders compressing the suspension creating a tight secure package. Rather then just the axles leaving the jeep to bounce uncontrollably.
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post #11 of 19 Old 01-06-2014, 04:27 PM Thread Starter
flipit
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Quote:
Originally Posted by jsawduste View Post
If you have a trailer then simply load the jeep up and ratchet off the frame to the trailer tie downs.

While trailering that is how I tie my junk down. Chain and chain binders compressing the suspension creating a tight secure package. Rather then just the axles leaving the jeep to bounce uncontrollably.
Oh, that's a good one, I don't have a trailer yet, I'm thinking about building one, I've been reading up on the laws and stuff, could be fun. But I think I can find a suitable sub for that, thanks!

posted this on my crap phone

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post #12 of 19 Old 01-06-2014, 07:22 PM
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Quote:
Originally Posted by jsawduste View Post
I`ve done this a number of times.

Nothing wrong with using the wider ratchet straps for cycling the suspension. A bit of planning where your going to place the strap and remember the kinetic energy stored when tightened down.
I've done it is well. This is why I have said I don't recommend it! Lol. It isn't a good way to cycle the suspension or measure much of anything other than gas tank skid clearance. I would find a way to take Anticanman up on his offer or just find a good flexer. I have experience a broken brake line on a crawler I built in my youth because I didn't properly cycle the suspension. I was using a cherry picker and a jack that time.

90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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post #13 of 19 Old 01-06-2014, 07:29 PM
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That was the most confusing and complex way to ask how to measure for shocks. Lol

The cherry picker option is a good one I've seen used before if you can't drive the jeep anywhere to flex it.
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post #14 of 19 Old 01-06-2014, 08:01 PM Thread Starter
flipit
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Quote:
Originally Posted by yjcrawlr View Post
I've done it is well. This is why I have said I don't recommend it! Lol. It isn't a good way to cycle the suspension or measure much of anything other than gas tank skid clearance. I would find a way to take Anticanman up on his offer or just find a good flexer. I have experience a broken brake line on a crawler I built in my youth because I didn't properly cycle the suspension. I was using a cherry picker and a jack that time.
well, If everyones done it then I definitely gotta see how crazy it is!
I figure It'll be good for gas tank clearance definitely,
maybe other things too, I'll have to see

Quote:
Originally Posted by bgredjeep View Post
That was the most confusing and complex way to ask how to measure for shocks. Lol

The cherry picker option is a good one I've seen used before if you can't drive the jeep anywhere to flex it.
I was hoping to not just ask how to measure for shocks, I knew how to do the flex part, I was curious about the rear pumpkin compression,
and was hoping to kind of see some banter about the different options,
while first of course shooting at my own half-cracked epiphanies.

I've seen quite a few guys ask about shocks or brakes and the ole how to,
so I was shooting for a catch all thread.
and since we hit ratchet strapping trailers, and the regular flex routes,
I'd say we got most of the possibilities.

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post #15 of 19 Old 01-06-2014, 08:19 PM
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I have used a set of springs that only have the main spring in it to flex it and it worked pretty well.
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