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Old 07-29-2009, 05:40 PM
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Default New Rear

I found my new rear. Actually its a used 10 bolt but it was cheap and has low miles. My question is my stock a4 is tuned to 3.23s and my new rear has 3.42s. Can I run my car for a while before I can get it tuned to its new gear or do I need to run and get it tuned fast?
Old 07-29-2009, 07:36 PM
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i do believe your speedo wil just be off but engine wise teh car will run just fine
Old 07-29-2009, 08:35 PM
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I ran my 3.70's for a couple of days. Your shifts will be off.
Old 07-29-2009, 09:26 PM
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Originally Posted by shannon french
i do believe your speedo wil just be off but engine wise teh car will run just fine
How much will the speedo be off?
A tune will fix that right?
Old 07-29-2009, 09:28 PM
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Originally Posted by Intercooler2
I ran my 3.70's for a couple of days. Your shifts will be off.
Im hopefully going to put it in friday. Ill have to run it through the weekend. With my shifts being off slightly it wont hurt anything until monday or so will it?
Old 07-29-2009, 11:36 PM
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No and your jump is smaller than mine so your shifts and speedo will be less off. Just take it easy
Old 07-30-2009, 10:56 PM
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If I had my choice I would go with 3.73s. But with my given options and amount of money I have to put into it, Im going with whats available. The guy is selling me a used low mileage rear out of a 2000 model camaro for $300. I can't beat that.
Old 07-30-2009, 11:01 PM
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Most tuners would be chill about a quick pick me up. Nothin too difficult. I know someone who tried this but went from 273's to 410's haha almost doubled every mile!
Old 07-30-2009, 11:14 PM
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how much will your speedo be off. . .

Your car is used to 3.23s and the new one is 3.42, so the percentage difference is .94444, so when you used to go say 65mph, you're going to actually be going 61.38 now. . .
unless I totally screwed up the math and you could be going 68.8, but you'll figure it out pretty quick. VERY VERY minor either way.
Old 07-30-2009, 11:29 PM
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Originally Posted by Duffster
how much will your speedo be off. . .

Your car is used to 3.23s and the new one is 3.42, so the percentage difference is .94444, so when you used to go say 65mph, you're going to actually be going 61.38 now. . .
unless I totally screwed up the math and you could be going 68.8, but you'll figure it out pretty quick. VERY VERY minor either way.
Haha gettin all techy then throw in the I could have just very much muffed that up... stayin classy!
Old 08-01-2009, 04:27 PM
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Well I looked everything over on my rear and compared it to the new one and it all looked fine but the axles are different and my rotors wont wont because the bolts are to fat and not long enough. Also my brakes wouldn't mount to it because the mounts are about an inch to short.

Does anyone have a rear end they would like to sale?




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