Depends on pinion angle, which depends on lift height and transfer case height.
Let's talk optimal build for 31" tires
- Thread starter Irun
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Have you considered the Rough Country 2.5" springs? I can't find specs, but they are marketed as progressive. Not sure if they can be bought without their shocks or not.
Re: H&R specs, I think others have tried to get them before. Please let us know if they provide them.
Don't limit yourself to progressive. None of that matters. All you care about is the free length and bind height. When I was building mine into something similar to this, the best I came up with was a specific OME coil with a small spacer.
This ^^^ With the Savvy skid system you push the transfer case up considerably. So much so that if you run a 241OR (Rubicon case) you have to clearance the tub a little. At least I did on two installs.
This is where I am, so far, i.e. 2933 up front and 2941 in the rear. I'm still waiting on a couple data points though!
I've looked at the General Grabber A/TX, which shows as a true 31" tire. The Mickey Thompson ATZ P3 I'm leaning towards is 30.8", which is close enough for me. As @SkylinesSuck stated, I've also looked at 32X11.50R15 tires. These generally come in at 31.5", but the trade off is the wider section width, which I don't want.
Of course I could always go with a 33x10.50R15 tire. This would make my suspension choice much easier and I've run that size tire before with great success.
I looked at RC, but couldn't find the specs. Also, I talked to H&R and was told they don't make their spring rates or free length numbers available to the public. Something about there not being an industry standard on measurements, so they choose not to disclose the information.
What size spacer are y'all looking at? I'm very interested and wanna look into this as well, as something that I might do with a tax return this year. Are those the springs you have found to be what's best for a build like this?
If you're talk about a spacer for leveling the front, that's typically 3/4". The spring numbers are dependent on how heavy your front and rear is. An easy place to go look is here.
https://dpgoffroad.com/product/tjlj-wrangler-coil-springs/
Not just for leveling, but also to extend the free length a bit. The more spacer you can cram in there without creating coil bind, the "longer" the spring gets without creating problems.
the build I had in mind has the word Rubicon on either side of the hood and it's completely stock.
I know that is solid .... I think it would shock and embarrass a lot of people in the four-wheel drive world what a TJ setup like you described could do.
Given the Savvy UA pushes the transfer case up high, are adjustable arms needs to set the pinion angle? Or, does a replacement double cardan driveshaft obviate that need?
Both are needed. The Savvy skid is the equivalent to a 3" spring lift as far as the driveshaft is concerned.
The driveshafts aren't going to know the difference between a TT and a suspension lift as far as ujoint operating angles are concerned.
Then they should be included in the list, so others don't think it's as simple as was stated. Both of those combined are significant expenses to many people.
Both are needed. The Savvy skid plus a 1" coil spring spacer is the equivalent of 4" of suspension lift.
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