Results from 9-bolt 3.45 to 3.70
Thread Starter
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Results from 9-bolt 3.45 to 3.70
I recently swapped my 3.45 ratio 9-bolt to a 3.70 ratio, to go with my soon to come T56 swap. I'm still running the T5 in the meantime. The car launches better and pulls harder thru the gears, but I still cant get any traction to run a better ET. What I really like is cruising along at 70 MPH on the freeway, tapping the throttle to pass someone, and hitting 90 MPH really quickly! 
I've found that I've lost 5 MPH per RPM, meaning I was at 2000 RPMs at 60 MPH in overdrive, now I'm at 55 MPH. I was at 3000 RPMs at 65 MPH in 4th gear, now I'm at 60 MPH.
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
I've found that I've lost 5 MPH per RPM, meaning I was at 2000 RPMs at 60 MPH in overdrive, now I'm at 55 MPH. I was at 3000 RPMs at 65 MPH in 4th gear, now I'm at 60 MPH.------------------
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
Thread Starter
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
You guys can quit emailing me now. The 3.45 rear end went into my dad's car, and his 3.27 rear end was sold to a local guy. Sorry...
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