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Old 10-24-2009, 02:17 AM   #140 (permalink)
almightybmw
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Join Date: Jul 2008
Location: Bozeman, MT
Posts: 248

Daily Driver - '02 Pontiac Grand Prix SE
90 day: 18.45 mpg (US)
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Quote:
Originally Posted by Nevyn View Post
If that 02 GP SE is geared anything like my 99, then there is little reason to do this. My wife's GP shifts as follows:

1-2: 10~11
2-3: 20~23
TCC lock: 26~28
4th OD: 41

I can drive around at 35 MPH with the TCC locked at 1550 RPM.
you don't have the same transmission than I, you have a different final drive, assuming you have the 3.1 vs 3.8. With the 225/60R16 tires I hit 3rd by 28mph, and it'll kick down to 2nd if I go much lower. 4th won't engage until 39mph. 3rd "locks" in the sense that the rpm shift is minimal, but it doesn't lock 1:1, and as speed increases so does the flex in the 3rd rpm range. So not real "lock" there. And 4th, or OD lock can't handle much torque before unlocking into 4th, and on some of the mountains here my speed decreases such going up that it has to backshift to 3rd to make it.
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