Caster/Toe with 40's? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 11 Old 04-10-2013, 07:58 AM Thread Starter
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Caster/Toe with 40's?

Hey folks,

Looking for some input on appropriate caster and toe set up for a rig on 40's. I plan to use it for back up daily driving and wheeling.

Unlimited
PR60 Front 68.5"
4" Tera springs with 1" rubber spacer
Currie arms, JKS front track, RE rear track
40" MTR's on TR beadlocks

Thanks
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post #2 of 11 Old 04-10-2013, 10:07 AM
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I am sure somebody with 40s can confirm, but I believe the same 4-6 degrees of caster and 1/16-1/8th of toe-in still applies to JKs on 40s.
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post #3 of 11 Old 04-10-2013, 07:19 PM
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I would assume that pro rock was built with caster correction?

Some build info here:
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post #4 of 11 Old 04-10-2013, 07:34 PM
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I've always tried to hang around 5* Caster. Sometimes 6*. But I run lockout hubs on junkyard one-tons. I would imagine your Prorocks have correction, so you should be happy at 5*

With 40+ tires, I run about 3/16" toe in.
35-37's I run 1/8" toe in.
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post #5 of 11 Old 04-10-2013, 07:40 PM
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It's either Dynatrac or Currie that has an FAQ suggesting a JK with larger tires (37+) should be cool at around 4 - 5 degrees, no more.

'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.
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post #6 of 11 Old 04-10-2013, 09:25 PM Thread Starter
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Yes, caster corrected PR60.

Thanks for the input.
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post #7 of 11 Old 04-11-2013, 03:41 AM
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I've heard caster is less of a issue with bigger tires..... Is there truth to this ?

2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers
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post #8 of 11 Old 04-12-2013, 08:16 AM
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Quote:
Originally Posted by Co4Lo View Post
I've always tried to hang around 5* Caster. Sometimes 6*. But I run lockout hubs on junkyard one-tons. I would imagine your Prorocks have correction, so you should be happy at 5*

With 40+ tires, I run about 3/16" toe in.
35-37's I run 1/8" toe in.
where is the toe in dimension taken?from the wheels or the tires
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post #9 of 11 Old 04-12-2013, 08:20 AM
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Tires.

SOLD - '09 2dr Rubicon - 1.0Gal | 6spd | 37s | 4.88s |
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| OR-Fab cage | Poly Cage | BFH Front | XRC Rear | XRC12 Winch | Walker Evans Beadlocks |

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post #10 of 11 Old 04-12-2013, 08:57 AM
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Quote:
Originally Posted by kjeeper10 View Post
I've heard caster is less of a issue with bigger tires..... Is there truth to this ?
It depends. One thing that people often overlook when they run bigger tires/wheels is the scrub radius.
If you have more scrub, caster symptoms may not be as noticeable because there is more road force keeping the tires tracking. With less, it may tend to wander more.
So it's just a matter of dialing in YOUR setup until it works properly.
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post #11 of 11 Old 04-12-2013, 10:53 AM
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Thank you

2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers
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