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Scott R Scott R is offline
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Join Date: Feb 2001
Location: Aspen CO US
Posts: 16,054
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It's the differentials, damn clutch packs fail almost every 20k miles in them. $1500 for GM to repair them so they can go out again. Additives might buy you some time, but these thing lockup while driving when they go, can be dangerous.

If you're handy with diff's you can rebuild the packs yourself for about $300, but you need to be dead on setting the carrier back up. Or get an entire diff from a Caddy CSV as they have the heavy(er) duty carriers in them, however they still go out as well.

File a complaint with GM, they gave me some goodwill on we bought at auction recently. I only had to pay labor and they gave it a 12k warranty.
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Old 05-12-2011, 11:46 AM
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