TCC Lockup - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 10-21-2004, 02:48 AM   #1
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Default TCC Lockup

There'* been a lot of talk about the TCC and lockup, and reviewing previous threads, I've been thinking about some stuff.

Some agree (as does the car'* manual) if you're going to be city driving, manually select the Drive range. This way, the TCC doesn't have to lockup-unlock all the time.

However, in OD the TCC will lock in 3rd, and 4th gear. Therefore, if you live in a city where there are stretches of 30-40 MPH road, I'm almost certain the TCC would lock in 3rd, enhancing gas mileage. Then you have to ask yourself if saving gas is a priority, or risking TCC failure. I haven't heard of many TCC'* failing (and think of how many times the TCC lock cycles, compared to how many times your gears cycle), so I'll continue using overdrive.
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