GM 700R4 question

I'm having a shop do some upgrades to the trans in my truck - this is not the original, came from a van . The converter lockup solenoid has a problem , either a shorted coil or grounded supply wire because it keeps blowing the fuse (which also is the power supply for the radio!) . The shop has recommended I change it to a hydraulic lockup device and I'm wondering if it's a good idea . Anybody here have experience ? I'm also having the speedo drive gears replaced (new axle ratio) along with the tail housing bushing and seal , and a shift kit .

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Guess I shoulda said this is an '86 GMC 1500 LWB .

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