gear ratio
02-15-2011, 10:39 PM
#2
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If it's an A4, and has stock gears, it's either 2.73 or 3.23. You can determine which by checking the RPO code on the sticker found on the driver's door jamb. 2.73 = "GU2" and 3.23 = "GU5". If the sticker is not present you can check the driveshaft; an aluminum shaft = 3.23 and a steel shaft = 2.73 (this is of course assuming everything is still stock).
02-16-2011, 08:25 AM
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Yep almost certainly is 3.42. If someone did a swap the easiest way is to run the car up in 4th @ some mph (say 70) and read your tach. Use an online calc and viola, instant gear ratio.
02-16-2011, 03:02 PM
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All A4 SS and WS6 cars came with 3.23s. RPO GU5 (3.23) was a required option with either WU8 (SS) or WS6, when an auto trans (RPO MX0/M30) was selected.
GU5 was not included in the WU8 or WS6 package price though, so it was listed as a separate costed line item on the window stocker.
GU5 was not included in the WU8 or WS6 package price though, so it was listed as a separate costed line item on the window stocker.
Last edited by RPM WS6; 02-16-2011 at 03:09 PM.
02-16-2011, 07:19 PM
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hi,if unsure with ratio. raise rear end and support.place in neutral mark tire with chalk and rotate one revolution. count number of turns on drive shaft. 2 3/4=2.73--3 1/4 =3.23-
3 1/2= 3.42- 3.3/4 =3.73-4 1/10=4.10-4 1/2= 4.56. this is the fool proof way if no tag or marks on housing...........old school...........have a blessed day..........jim
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02-16-2011, 10:19 PM
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hi,
if unsure with ratio. raise rear end and support.place in neutral mark tire with chalk and rotate one revolution. count number of turns on drive shaft. 2 3/4=2.73--3 1/4 =3.23-
3 1/2= 3.42- 3.3/4 =3.73-4 1/10=4.10-4 1/2= 4.56. this is the fool proof way if no tag or marks on housing...........old school...........have a blessed day..........jim
if unsure with ratio. raise rear end and support.place in neutral mark tire with chalk and rotate one revolution. count number of turns on drive shaft. 2 3/4=2.73--3 1/4 =3.23-
3 1/2= 3.42- 3.3/4 =3.73-4 1/10=4.10-4 1/2= 4.56. this is the fool proof way if no tag or marks on housing...........old school...........have a blessed day..........jim
02-24-2011, 02:34 AM
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99 z28's with the a4 didnt come with 3.42's i swore the last time i checked into mine i thought i read that it had 3.42's. Now you say that im gonna check into that again,something dont sound right?
02-24-2011, 11:28 AM
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GU2 (standard): 2.73
GU5 (optional): 3.23
The only way you could get 3.42s from the factory in an LS1 Z28 was with an M6 trans.
