Owners of A4 with 3.73's need to know
 

What rpms are you running from 50 to 100 mph.thanks in advance for any input you can give me.

Re: Owners of A4 with 3.73's need to know
 

rpm = (mph * Axle ratio * Transmission ratio * 12 * 5280) / (3.14159 * Tire diameter * 60)

Your axle ratio would be 3.73 and I believe 4th gear in an auto would be 0.74...that might be fifth in a manual, I forget. Either way, that's the equation.

Re: Owners of A4 with 3.73's need to know
 

4L60 fourth is .69 as I recall. .69 or .70

Re: Owners of A4 with 3.73's need to know
 

Top gear ratios on a few trannies:

4L60E - 0.70
T-56 - 0.50
200-4R - 0.67
TH350/400 - 1.00 (no OD)
Powerglide - 1.00 (no OD)

Makes a huge difference in highway RPMs. My car, with the 200-4R and 3.73s, is about 2300 RPM. Pretty livable with the converter locked.

Re: Owners of A4 with 3.73's need to know
 

Here you go, try this out, plug in the numbers, it worked great for a dumb ass like me:

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

SteveC <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Re: Owners of A4 with 3.73's need to know
 

Umm... Cant drive the car right now, no motor & snow, well you know about that..
From memory, I am at 2400 @ 70 mph. Get back with me in the summer and I'll check again. I'm sure it's going to depend on what convertor you have. I have the Vig 3600 right now.

What convertor do you have right now?

Re: Owners of A4 with 3.73's need to know
 

i had the yank 3200 but it killed 3 yes 3 transmissions ,so i put the stock one back in.Give me a bump in the month of May we will be renting out miland on the second thursday of each month from 6-9 pm for shits and grins

Re: Owners of A4 with 3.73's need to know
 

have it on the 35th but speedo not calibrated yet so kind of off like 10mph.guessing.

Re: Owners of A4 with 3.73's need to know
 

My A4 with 3:73's run 2300 RPM's at 70 MPH. I checked mine yesterday because I am having 4:10's installed I am verifying the increase in RPM's with these gears. I hope these new gears help some at the track.