your truck should shift into 4hi at any speed up to 60 mph with no problems. Sounds like a mode control switch problem and this will not turn on the service 4 wheel drive message in the DIC. Take it to your dealer and they should have no problem addressing the problem.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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