Chevrolet Repair: tcc solenoid bad?93 s10 blazer, s10 blazer, bad hope

Question
truck stuck in overdrive-does not stall-engine is a 4.3 vortec engine & trans is automatic w/ overdrive. also a question about the digital instrument cluster-not working speedomter was but now that isn't either. checked fuses,wiring and replaced w/ a used cluster but still doesn't work.

Answer
Hi Dawn.... check the speedo pick up at the trans...if tcc stuck on try disconnecting the connection for it at the trans. check for a short to ground in the circut also check across the solenoid for a closed circut. if closed when diconnected solenoid is bad. hope this helps