DriBak

My car had a few mods b4 I got it and the dealer didn't know or didn't admit to know about them I turn 2500 RPM at 70 mph does this confirm 2.73 rear end I just thought if some one did some motor and suspension mods they might have done some gear changes, door sticker says 2.73 this is a 2000 A4

Blacker

iTrader: (3)

When I had 2.73's, is was ~2,000rpm at 74mph. I would say you have 3.73's.

http://www.f-body.org/gears/

Broken041

I have 2.73's currently.....soon to change. Umm. At 80mph, I am turning just shy of 2000.

Slacker

I turn 2400ish at 70mph, & I got 3:42's

Bad N Black

In my old 94Z with 3.73 it was at 2500rpm at 65mph. The best way to go about this is. Lift the diff. up and rotate both rear tires even 1 complet turn wile counting the rotation on drive shaft. Mark that drive shaft real good so you can see it. Tape, marker, whatever you can see with. If your shaft rotates about 3.5 times that would mean you have 3.42 gears. good luck

firechicken2k

at 70mph, you should be around 1600rpm with 2.73
at 80mph, you should be at pretty much exactly 2000rpm, with 2.73


you do not have 2.73 ...

SmokingWS6

iTrader: (1)

Those are 3.73's 2.73's would be around 1800 or so at 70.

I have 3.42's and i'm turning 2500 around 80mph.

DriBak

Thanks guys, I figured 2500 rpm's was kind of high for a "high geared car" at 70 mph I'll check out the link above and do the rotation count when I have a chance.

DriBak

Looks like shaft rotated 4 times with 1 tire rotation

98formulaMAH

iTrader: (11)

i swear is everyone a dumbass. If you ahve an a4, if you are in 3rd gear going 75mph on a calibrated speedo, the RPM will read your gear ratio, i.e. 2730 rpm in 3rd @ 75mph. This if for the A4's.

robss01

I guess there are ******** on every board.

BOBA_VETT

May be, but he's right.

Put-er in 3rd on the freeway and go 75mph.

Takes the guesswork out of it, really.

Stone0fFire

thank you 98formulaMAH
everyone who read your post
and didnt already know what you said
is now less of a dumbass

robss01 however
did not contribute anything useful
and is therefore the very ******* he mentioned.

i would be number two, i guess

and thanks blacker
that link really should be a sticky

B T

>>>>>

Thanks for that info 98formulaMAH.

I'm a lessor DA now.


Sticky please.

DriBak

Well I'll go 75 MPH in 3rd and see what my RPM's tell me. I know I'm a dumb *** the wife reminds me daily.

98formulaMAH

iTrader: (11)

No problem guys

Z28LS1camaroguy

iTrader: (3)

look on the sticker on your door if there is a GU5 then you have 3.73 gears and if you have GU2 then you have the 2.73 gears. thats if the rear end is still stock.

akZ28

GU5=3.23 rear end ratio

black00TA

iTrader: (3)

well u can check to see if your MPH is off by driving down the highway and watching the mile marker to see if your car is counting the correct miles, that will tell you if the car has an aftermarket gear, or if its dead on, it has been tuned.

my .02

beaSSt

There's a good gear chart versus tire diameter on "Gears Are Us"

Similar approach to above -- 55 mph at 1:1 final drive

http://www.gearsareus.com/GearsAreUs...f/geartalk.htm