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As Mentioned, look at the tcase for a pinhole. Google GM tcase pump rub for pics of where the hole developes. Also, look at th front diff and its axle seals for leaks. If it has air ride check out the shocks and the rubber boots on them, those shocks and compressor are extremely expensive to replace.
 

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Also, check exhaust manifold bolts where they bolt to the head. They are known to break off. While many times they don't result in a leak you may be able to use that as bargaining power
 

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And i forgot to mention the intermediary steering shaft that might need replacment too, though it's an easy swap.
Good point about the steering shaft. When it is bad it will clunk over bumps and while turning. But you can just use that as a bargaining tool also. I think a new shaft is around $80 but there's no point in trying to replace them as the new one will go bad also. It is cheaper and a more permanent fix to put a $.65 Zerk fitting in the shaft and grease it. Same with bad stepper motors. You can have the entire cluster require with new bulbs and motors for $125 or buy a ss version for around $350
 

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I got about a year out of my Dorman. Then it started clunking again. I put the Zerk in and have not had any noise in almost a year
 
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