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LCA relocation vs Adj UCA

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Old 10-08-2013, 06:32 AM
  #1  
jayh007
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Default LCA relocation vs Adj UCA

I’ve done the following modifications to rear suspension. Lower rear 1.5 inch, new sway bar, and BMR LCA fixed length. I was going to add a adjustable UCA but I’ve read a number of horror stories about the installation. I was thinking of just installing a LCA relocation bracket. By lower the arm and changing the angle you effectively shorten the arm. With a little creative math I should be able to figure what angle to set the LCA and correct the pinion angle. Any comments or opinions why this would or wouldn’t work.
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Old 10-08-2013, 08:35 PM
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dlazrael
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I'd like to know myself, it will help with my own plans
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Old 10-09-2013, 12:12 AM
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RedFire281
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LCA relocation brackets will probably increase your roll oversteer which could make hard cornering an exciting experience (not in a good way unless you like drifting). IMHO you should consider selling the fixed length LCA and use the money toward an adjustable LCA and set the pinion angle that way.
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Old 10-10-2013, 06:49 AM
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Norm Peterson
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Originally Posted by jayh007
I was thinking of just installing a LCA relocation bracket. By lower the arm and changing the angle you effectively shorten the arm. With a little creative math I should be able to figure what angle to set the LCA and correct the pinion angle. Any comments or opinions why this would or wouldn’t work.
You are making a big assumption that may well be incorrect - and I'm pretty sure it flat-out is incorrect in a couple of cases. The holes on at least some relo brackets are drilled along an arc specifically to avoid messing with pinion angle as axle-side LCA pivot adjustments are made.

Never mind that with relo brackets there is some chance that due to fabrication and/or installation errors you will still need at least one LCA to be adjustable in order to square the axle in the chassis (zero thrust angle on an alignment printout sheet). For this reason I would never consider doing only the relo brackets and calling it done. Even if I was willing to try just the brackets, it would be with planning from the get-go to get the adjustable LCAs if the axle ended up the least bit out of square.


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Last edited by Norm Peterson; 10-10-2013 at 06:59 AM.
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Old 10-10-2013, 09:26 AM
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jayh007
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Thanks, you are right on both posts. I guess the right thing to do is change to adjustable Upper control arm.
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Old 10-10-2013, 09:28 AM
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hootie_john
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So a fixed length LCA with adjustable upper control arm is the "ticket" for a lowered car? I'm noticing some more pronounced wheel hop since lowering the car...
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Old 09-09-2014, 06:58 PM
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