Automatic transmission GMC Safari - LS1TECH

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Automatic transmission GMC Safari

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Old 05-05-2012, 02:19 PM   #1
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Default Automatic transmission GMC Safari

When shifting between 1st and 2nd, a noticeable speed surge; between 2nd and 3rd, a fairly loud clunk - any ideas?
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Old 05-05-2012, 08:19 PM   #2
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2 to 3 could be a shift spring if you're lucky, the 1 to 2 sounds like clutch slip. Have you changed the fluid? I had a broken spring in my 4L60E around 230k, changed it and went to 400k before I rebuilt it. I change the fluid every 30k miles though too.
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