I read somewhere that on a 98 gmc its usually an NSBU sw on left side of transmission costs around $90. a couple of dollars less at an Allison dealer. not sure what that switch is but sounds like maybe could be similar to the Chrysler solenoid pack with similar price that can cause similar problems. dont take it as gosple. I just saw it while researching similar problem and thought id pass it along, and maybe it'd be useful to look at.
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