94 SLS, Speedo quits and tranny mis-shifts

ducky101

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Hey Y'all, (yep, from Tx)
I have a '94 SLS with the NS eng.
Sometimes my speedometer won't work until I get over 45-50mph and my tranny won't shift into 2nd unless I floor it for a sec or two.
This is an off and on again prob. Not consistent.
I've been told it "could" be the speed sensor or the crank sensor although I don't know what the crank sensor would have to do with this particular prob.
I've also been told my ECU/PCM is going out or wiring to/from ECU is shorting.
I would pull my hair out over this prob if I had hair.
Any advice?
 

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