Suspension and Chassis Questions about your suspension? Need chassis advice?

Rear suspension upgrades

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Old 06-21-2018, 02:23 PM
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Car: 1992 Camaro Z-28
Engine: 355
Transmission: Custom 700-R4
Axle/Gears: Stock 4th gen
Rear suspension upgrades

I recently purchased a used 98-02 diff assembly from Hawks and I thought I would replace the LCAs and torque arm.
My question is concerning Spohn vs UMI, tubular vs square, adjustable vs fixed, and mild steel vs chrome moly. I have no ambitions of performing 3000 rpm clutch dumps with slicks or any other form of extreme driveline abuse. It's a fun street car, but it does have a procharged 355 with 700r4, so there is a need for strength.
I was thinking of going with mild steel, fixed, tubular LCAs and a mild steel adjustable panhard bar, and a mild steel adjustable torque arm mounted to the trans crossmember.

Any suggestions/thoughts?

Thanks,
Jamie
Old 06-21-2018, 02:54 PM
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Car: 91 TA / 91 Formula
Engine: 305
Transmission: 700R4
Axle/Gears: 3.42
Re: Rear suspension upgrades

I would make sure to go poly instead of rod end for a street car just for sound issues. Rod ends are loud. I have UMI on 2 cars and Founders on another and can tell no difference, so I would definitely consider them especially for the price savings. Adjustable is never a bad idea on LCAs though is not usually needed, but I think it is a must on a panhard bar.
Old 06-21-2018, 06:51 PM
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Car: 91 Black Formula KR
Engine: 305 TPI R69/G92
Transmission: Astro A5-Pro 5.0-McCleod
Axle/Gears: US Gear 3.42 Eaton True Trac
Re: Rear suspension upgrades

The Founders 3 way poly joints for street are excellent! Have a set myself
I'd get their panhard bar too...

As for torque arms... I've had a few and all seem to make noise...
A worthwhile investment was the poly bushing for the stock arm...
No noise, noticeable difference... once you switch the arm from stock, it's a bit louder..
At least from my experience...

Rafael
Old 06-21-2018, 06:52 PM
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Re: Rear suspension upgrades

Oh, and weld in sub frame connectors are nice too
Old 06-21-2018, 08:02 PM
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Re: Rear suspension upgrades

LCARBs
Old 06-24-2018, 04:57 PM
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Re: Rear suspension upgrades

Originally Posted by jsweatt
I recently purchased a used 98-02 diff assembly from Hawks... it does have a procharged 355 with 700r4, so there is a need for strength.
You didn't buy another ten bolt did you? If so your money needs to go into a better differential. Forget suspension till then unless you're going to baby the car.
Otherwise:
Subframe connectors
Lower control arm relocation brackets (LCARBs)
Bushings or replacing the whole arm assembly(s)
Torque arm mounted on the tranny crossmember
Old 06-26-2018, 08:58 AM
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Car: 1989 GTA Nighthawk
Engine: 389 CID TPI
Transmission: TCI 700R4
Axle/Gears: 9 bolt 3.23
Re: Rear suspension upgrades

Putting the Torque arm to the transmission crossmember is a stronger place to mount, however it is louder as well. If you get the adjustable torque arm that attaches to the Transmission with a Poly bushing it is quieter. I know because I have had both and the solid mount makes a good bit of noise! I think everyone else covered everything quite well.
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