Quote:
Originally Posted by Jetboy
In the 1.5-2" lift range there's a little bit of trickyness in alignments. The problem is that the UCAs add about 4 degrees of caster. At 3" of lift that's what you want. Half way in the middle, it's maybe too much - and by that I mean you can get great alignment, but at 4* caster you won't be maxing out the caster available on the lower control arm tabs - so you won't be pushing the tires as far forward away from the body mount as you would with stock arms.
I recently lowered my suspension back to around 1.5" lift and put the stock UCAs back on. (I have some JBA arms I used at higher lift). The reason was what I explained above. At 1.5" lift front I had to either run 6-7* caster to max the body clearance or pull it back to 4*. Not a problem with 33" tires, but with 34" tires it can rub a little. So I swapped back to stock UCAs and set around 3* caster, but better body clearance. The stock UCA locates the upper ball joint further forward as well. So the net of the lower height is that - oddly - at the lower height I think I might even be able to squeeze 35's. If I had a set I'd bolt em on and see if they fit.
I'm doing a lot of highway miles lately that prompted the lowering. The ride is noticeably better at 1.5" than 3" lift on long road trips.
Overall though - I'd say no question the higher caster is nicer all around for driving. Once you get below about 2* the steering wheel feedback sucks and it doesn't want to track very well. After messing around a lot with mine - I think 3* is okay, but around 4-4.5* is close to ideal.
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So, If I'm understanding correctly, at a 2" lift (and higher) I'm good to put on the JBA UCA's but if its under 2" lift I should keep the stock UCA's?
The FJ PRO Springs (14" long @ 600lbs) is supposed to give a 5th Gen T4R a 2.5" lift stock front and a 2" lift with Lo-Pro bumper + Winch. I've gathered this info from the forum and have the FJ PRO Springs and JBA UCAs in the garage waiting for install.
I daily drive my T4R but travel to the mountains (Just recently did Alpine Loop in the San Juan Mountans, CO) so I wanted a "modest" lift that's good for highway driving and the week-long off-roading vacation.
I appreciate the nuance in your response. Thank you for your help!
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"HANZO" 2015 TRD PRO: SSO Front Bumper w/ Stage 2, SCS F5's (17x9-38), 285/70/17 Falken Wildpeaks, 2" all-around Dobinsons IMS, JBA UCAs, Slee Sliders, BMC, Warn Winch, LED High/Low, DD SS3 Fogs, Rigid Lightbars (Amber/White light), Nise Rack, Extended Diff Breather.
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