UMI rear arm relocation brackets
Junior Member

Joined: Jun 2014
Posts: 34
Likes: 0
From: pembroke ,pines fla
Car: 82 Z28
Engine: 350 LT1
Transmission: 700r4
Axle/Gears: 3.73
Re: UMI rear arm relocation brackets
i have them welded in i have 1'' lowering springs and kyb shocks addjustable panard bar
also up graded the sway bar am running them on last bolt
also up graded the sway bar am running them on last bolt
Re: UMI rear arm relocation brackets
You can run the lowest hole with stock springs for good forward traction. You can experiment as well. We added a third hole for more rear tuning. For forward traction place the rear control arm with the rear of it slightly lower than the front.
Re: UMI rear arm relocation brackets
Supreme Member




Joined: Oct 2004
Posts: 4,527
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: UMI rear arm relocation brackets
I am running the founders bolt in model 1" drop and love them
Member
Joined: Aug 2013
Posts: 390
Likes: 0
From: Milltown, NJ
Car: 86 iroc, 02 v6 camaro
Engine: 350 HSR, 3800 V6
Transmission: T56, WCT5
Axle/Gears: 9in 4.11 posi, 3.23 LSD
Re: UMI rear arm relocation brackets
worth every penny for them IF you are lowered. i have bolt in founders.
they will do nothing for you if you arent lowered as the control arms are already at the optimal angle.
they will do nothing for you if you arent lowered as the control arms are already at the optimal angle.
Supreme Member




Joined: Oct 2004
Posts: 4,527
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: UMI rear arm relocation brackets
http://www.foundersperformance.com/c...tion-Brackets/
These are what I have. They are a super tight fit and every hole will just barely clear the bolts but I like that a lot.
These are what I have. They are a super tight fit and every hole will just barely clear the bolts but I like that a lot.
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Junior Member
Joined: Feb 2014
Posts: 79
Likes: 1
From: Jeffersonvlle
Car: 85 iroc with 92 ground effects
Engine: 355 11.1 world product heads
Transmission: t56
Axle/Gears: 3.54 dana 44
Re: UMI rear arm relocation brackets
I run the umi ones and they fit great. I like how they hooked to the shock mounting bolt. My car is lowered though. They got rid any wheel hop I was having
Supreme Member
Joined: Jul 2007
Posts: 1,293
Likes: 6
From: Howard Lake, MN
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: UMI rear arm relocation brackets
what is the "optimum angle", because mine are pointed down a lot.. chassis mounting point is about 1" lower than the mounting point on the rear axle, as measured from the level concrete floor of my garage. my car sits quite high, since it's a pretty stripped down car with brand new IROC replacement Moog springs in it.. if i lower the rear, it will just point them down farther in the front.
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: UMI rear arm relocation brackets
GM didn't have the finished product of these cars as engineered as well as you might think, easily evidenced with the additional "braces" you see all over the front half of the car. There are long and plentiful discussions about the GM engineers on these boards. But all that aside you do not need not to have a lowered car to need the relocation brackets. These cars have defective geometry that was designed in and gets worse as the springs sag. At one point I had new Moog stock springs and joints and the body mount side of the LCA was lower than the differential side by 3*. There are also many good discussions about the optimum angle but just ensuring that the body mount is higher than the differential mount will get you in the ball park. Thread
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