I believe I killed my new PIF transmission... - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-12-2007, 12:17 AM   #21
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Mike, out of curiousity, can you explain a little more about why you would choose 3.43s over 3.73s?
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Old 09-12-2007, 09:14 AM   #22
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I see the difference coming in to get more mid/high range out of the setup. As Mike mentioned, you have good mid power and with the 3.73s you would usually be high in the rpms instead of mid.
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Old 09-12-2007, 11:09 AM   #23
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Lets look at the Northstar.... A lot of them have a 3.71 gear ratio... But they shift at 6500-7000 grand iirc..

The 4T60-E'* Pump becomes inefficient after 6000 rpms... So when you shift at 6200,6300,6400.... You are not doing the trans any favors at all..

I do feel that your car would be great with 3.33 or 3.43 gears.... The 3.33, uses the HD diff..

Even with your cam I'm pretty sure you are doing a lot better in the upper part of the mid range on up to the red line.. I still thik 3.73 is overkill for what that motor is going to do and what it will do in the future..

Just being curious, when you go through the trap are you in third gear? And at what speed do you hit 3rd gear WOT? Also what RPM'* are you shifting at?

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