Transmission 99 Bonneville SSE - 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 07-28-2008, 10:34 AM   #1
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Default Transmission 99 Bonneville SSE

Stutters when shifting hard. Also the has very bad banging when accelerating from a dead stop sometimes.

The car has 125K and the tranny was serviced recently but did not fix it.

Any thoughts?
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Old 07-28-2008, 11:09 AM   #2
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Do you know if any codes are presently stored in the pcm for the trans? Most of the trans codes will push the line pressure to max (96psi) and that makes shifts pretty harsh.

As for the shuddering, most likely it'* a prelude to a rebuild or swap.
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