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Is the check engine light on? If you're slipping clutches the trans would set a code.

You might be experiencing the classic NSBU switch failure. That will cause the truck to default to 3rd range which may feel like slippage. Is the PRNDL lighting up correcting when you select ranges?
 

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Discussion Starter · #3 ·
no engine light comin on if im not on the pedle it dont slip if im stomp on it it slips in second ??? open to opinions im thinking of rebuilding
 
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