Transmission issues

Asked by Jan 30, 2017 at 12:05 PM about the 1990 GMC Suburban R1500

Question type: Maintenance & Repair

90 Chevy suburban  well driving will shift
in first and second but not pass that what
may be the problem and how can I fix it

1 Answer

124,215

Take a look at the vacuum modulator as well as the vacuum hose and possibly electrical connection on the side of the tranny, be sure they are still there and not comprimized.

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