elwood2

iTrader: (5)

I'm doing about 2500RPM's at 75MPH. According to the gear calculator that would make it a 3.73. My speedometer seems to be correct.

The door code is GU5 (3.23). The A4 transmission was recently rebuilt, what are the odds that the gears were changed in the transmission?

My rear end housing is bent so i'm trying to find a used one. I need to be sure which gears i have so i can try and get the same one so i don't have to have my PCM reflashed for the gear change.

01ssreda4

iTrader: (96)

Very slim chance about tranny gears, those bitches are very expensive and I dont think 4th is changed with that planetary set-up anyway. With 3.23s you should be sitting dead nuts on 2k at 68 mph. With 3.73s you will be about 2400 at 70mph. I have had both.

lemons12

iTrader: (71)

Granted you have a normal tire size....

373s

elwood2

iTrader: (5)

275/40r17's except on the rear drivers side it's a 255/40r17. It's off by about .5MPH

FirstYrLS1Z

iTrader: (4)

with my OEM 3.23s',before acquiring a ScanGaugeII ( to accurately read rpm and other engine parameters ) and before the use of GPS (to indicate accurate mph), my factory dash gauges would indicate 2200rpm @ 68mph,that would equate to 2425rpm @ 75mph.

WizardofDetailing

iTrader: (7)

Real simple, jack the rear end up. Spin the tire and see how many times the drive shaft spins with one rotation of the tire. That is the most accurate way to find out. 3 1/4 spins is 3.23.....3 1/2 spins 3.42...etc....

heymoej

iTrader: (67)

this^^^

mark the yoke or drive shaft,so you can see it when it comes around.

c6matt

iTrader: (1)

are you telling me you are running diffrent size rear tires? thats terrible on a diffrential.. you need to get a matching size tire....

elwood2

iTrader: (5)

The previous owner did. She had a nail and went to a shop and i'm sure that's what they put her and she never noticed.

I'm on the hunt for a replacement right now.