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Old 03-12-2014, 02:28 PM   #1
tom's2005gto
 
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Suspension mods while diff upgrade?

I have a 2009 A6 GXP with 40k miles on it. I recently acquired a low mileage 3.45 diff from a Camaro SS.

Plan to install it and have ordered diff and cradle bushings from Andy.

What else should be done to the rear suspension at the same time? Please be specific as I am still learning about the G8 platform. Parts numbers would be greatly appreciated. Note, I'd like to see the rear of the car lowered about 1/2" if possible.

Thanks, Tom
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Old 03-12-2014, 08:24 PM   #2
376LS3
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Hey Tom,
Im not sure I would do the diff bushings. We have cars on here that are low 10's running stock diff bushings. Being an auto car, they're not as relevant as with an M6. I have them, and hate them. I would absolutely upgrade your trailing arms. That is going to give you the biggest cure against wheel hop. Since you already have subframe bushings, those 2 go hand in hand. I myself only have done the PFADT trailing arms and I havent had an once of wheel hop. Now that I have springs and sway ready to go on, (thank you for that) it should make car feel even better. The only way you can get the rear down 1/2" will be with a coilover setup. We dont have springs that offer 1/2". We only have 1" springs which typically turns into 1.5" once the car settles. A little too low for me, but we'll see how it rides. Now that PFADTs gone, I would work with BMR:

http://www.jdpmotorsports.com/parts/...g8-gxp-tca026g

http://www.jdpmotorsports.com/parts/...-gt-gxp-tr002g

Hope that kinda helped.....
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Old 03-12-2014, 09:27 PM   #3
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Adam, Thanks for the help!
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Old 03-12-2014, 10:07 PM   #4
376LS3
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Anytime man! Let me know if you need anything else!
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Old 03-13-2014, 12:07 PM   #5
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Quote:
Originally Posted by 376LS3 View Post
Hey Tom,
Im not sure I would do the diff bushings. We have cars on here that are low 10's running stock diff bushings. Being an auto car, they're not as relevant as with an M6. I have them, and hate them. I would absolutely upgrade your trailing arms. That is going to give you the biggest cure against wheel hop. Since you already have subframe bushings, those 2 go hand in hand. I myself only have done the PFADT trailing arms and I havent had an once of wheel hop. Now that I have springs and sway ready to go on, (thank you for that) it should make car feel even better. The only way you can get the rear down 1/2" will be with a coilover setup. We dont have springs that offer 1/2". We only have 1" springs which typically turns into 1.5" once the car settles. A little too low for me, but we'll see how it rides. Now that PFADTs gone, I would work with BMR:

http://www.jdpmotorsports.com/parts/...g8-gxp-tca026g

http://www.jdpmotorsports.com/parts/...-gt-gxp-tr002g

Hope that kinda helped.....
Great response! The only thing I would add on top of that is the outer trailing arm bushings Part # BK006G.

Best regards,

Tyler
888-308-6007
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Old 03-13-2014, 01:01 PM   #6
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Good suggestions!!! Trailing Arms, Outer T/A Bushings, and Toe Rods will be a great addition to the new rear end. If you don't have Sway Bars already, that would be a good mod to do during this install too!!! BMR Part Number for a full front and rear set is (SB029). Call or PM me if you have any Questions!!!
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Old 03-13-2014, 01:59 PM   #7
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Tom, how's it going, if you have any questions i can help with you know how to get a hold of me.

I would hold off on the diff bushings if you don't have hop issues,

The rear of the Camaro from a bushing standpoint is 99% the same as the G8 is, the knuckles and upper arms are a bit different, but the bushings in them are the same with the exception of one that is a 12mm bolt vs the 14mm bolt the Camaro uses.

ps, i don't think anyone here knows who andy is.
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Old 03-13-2014, 03:16 PM   #8
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the trailing arms make a big difference and will help out alot.
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