Owners of A4 with 3.73's need to know
TECH Apprentice
Joined: May 2002
Posts: 320
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From: Phoenix, AZ
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.
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.
TECH Fanatic
Joined: Nov 2001
Posts: 1,347
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From: Freeland, MD
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.
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.
TECH Resident
Joined: Jan 2002
Posts: 876
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From: Poway, Ca. where GOD and the sun always shines
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 *** like me:
http://www.f-body.org/gears/
SteveC <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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?
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?
Thread Starter
Teching In
Joined: Dec 2001
Posts: 42
Likes: 0
From: Southfield Mich
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 ***** and grins
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TECH Enthusiast
Joined: Jan 2002
Posts: 559
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From: West Monore
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.