3.42 or 3.73
3.42 or 3.73 98 z28
LTS, ORY, Borla Cat-Back, Lid and bought a LS6 intake that is going on this weekend.
I am doing the rear the following weekend as my rear is humming like crazy right now. Its A4 with a BEEFED tranny just did it a month ago. I currently have 2.73's and wanna go to 3.42's or 3.73's? Is there a huge difference? I want to go with 3.42's cuz it does see the highway quite a bit but I don't wanna put 3.42's in and regret it and want 3.73's. Is there a huge difference in feel and performance?
LTS, ORY, Borla Cat-Back, Lid and bought a LS6 intake that is going on this weekend.
I am doing the rear the following weekend as my rear is humming like crazy right now. Its A4 with a BEEFED tranny just did it a month ago. I currently have 2.73's and wanna go to 3.42's or 3.73's? Is there a huge difference? I want to go with 3.42's cuz it does see the highway quite a bit but I don't wanna put 3.42's in and regret it and want 3.73's. Is there a huge difference in feel and performance?
Last edited by JKearney30; Nov 19, 2010 at 02:32 PM.
Get you a set of Yukon thick gears and you'll want the 3.73s. The last set I had installed were quiet and didn't roar a bit. Go to this site and punch in your variables and you'll see there isn't that much difference between the 3.42s and 3.73s when the ODs locked up on the highway. http://www.pszweb.com/car/gears.htm
3.73 is a good street gear. I just put gears in my A4 Z28 and I put 4.10 in it. Go big or go home..... Im really gonna regret that when im stopping at the gas station every other day......
I just went from 2.73 to 3.42 and it's a real tire burner now. The A4 has a pretty steep first gear and you get torque multiplication through the torque converter as well. The RPM's are as high as I want on the freeway.
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i had 2.73 when i bought my car. im running 3.73 right now, it woke up my car. but ive been wondering about stepping up to 4.10. im curious what to expect with a 3200 stall, 4.10.
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Back in 1978 I had a Trans-Am with a turbo 400, 3500 stall and a 12 bolt (from a '70 T/A) with 4.10 gears. 60 mph was about 3500 rpm... 4.10 gears with a 4L60E is very tolerable. If most of your driving is on the highway, then I'd go with 3.73 gears. Otherwise I'd go with 4.10 gears. Bob
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You can't make a suggestion for what rear gear ratio to choose for a 4L60E based on experience with a TH400. The transmissions have totally different gear ratios. The TH400 has a 2.48 first gear ratio. The 4L60E has a 3.06 first gear ratio. Mating 3.42 rear gears to a 4L60E gives you the same total first gear ratio as a TH400 with 4.22 gears. 
The whole point of the A4 transmission is to give you low gear response like an aggressively geared old muscle car without needing the old muscle car gears that blow away highway mileage and drivability. In any event, I would completely steer away from 4.10 gears in a stock 10 bolt because those gears aren't very strong and tend to break. No aftermarket gear is as strong and quiet as the original GM gears.
The whole point of the A4 transmission is to give you low gear response like an aggressively geared old muscle car without needing the old muscle car gears that blow away highway mileage and drivability. In any event, I would completely steer away from 4.10 gears in a stock 10 bolt because those gears aren't very strong and tend to break. No aftermarket gear is as strong and quiet as the original GM gears. You can't make a suggestion for what rear gear ratio to choose for a 4L60E based on experience with a TH400. The transmissions have totally different gear ratios. The TH400 has a 2.48 first gear ratio. The 4L60E has a 3.06 first gear ratio. Mating 3.42 rear gears to a 4L60E gives you the same total first gear ratio as a TH400 with 4.22 gears. The whole point of the A4 transmission is to give you low gear response like an aggressively geared old muscle car without needing the old muscle car gears that blow away highway mileage and drivability. In any event, I would completely steer away from 4.10 gears in a stock 10 bolt because those gears aren't very strong and tend to break. No aftermarket gear is as strong and quiet as the original GM gears.
The whole point of the A4 transmission is to give you low gear response like an aggressively geared old muscle car without needing the old muscle car gears that blow away highway mileage and drivability. In any event, I would completely steer away from 4.10 gears in a stock 10 bolt because those gears aren't very strong and tend to break. No aftermarket gear is as strong and quiet as the original GM gears.
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ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
