Why does my '98 shift hard and not all the time ? - 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 04-06-2007, 07:38 PM   #1
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Default Why does my '98 shift hard and not all the time ?

I bought this '98 Bonneville SLE a few months ago and now have 114,000 on it.
I've already changed the upper intake & lower intake gaskets.
New plugs and just had the trans. flushed and filter changed.

It seems to shift hard between 1st and 2nd and not all the time.
It did this before the trans. service. and now after ?

Why ?
Does anyone know ?
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