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Trans Temp Gauge Pegged Hot

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The sending unit for the dash gauge is located in the trans cooler hose "fitting" that  comes off the back of the transmission.

Check to see if that wire is shorted to ground or if the sender itself is bad (grounded internally). If the wire doesn't appear to be touching metal  or shorted to ground, just take the wire off the sender unit and if the gauge then goes to "0" your sender unit is bad. If the gauge stays pegged then the wire is shorted or the dash gauge is bad.

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