Trans won't shift to high or overdrive

Asked by GuruDQHQ3 Sep 06, 2017 at 12:56 PM about the 1993 Chevrolet C/K 1500 Silverado Extended Cab LB 4WD

Question type: Maintenance & Repair

My truck won't shift into high gear or
overdrive. It's a 1993 Chev pick up. 4x4.
The Trans is a 64ld.

3 Answers
22,215

Gary answered 7 years ago

Check the fluid level to be sure it is full. Also check the vacuum hose that goes to the trans modulator. Shifting is controlled by vacuum and if the hose is cracked (not getting vacuum), the trans will not shift. Can you manually upshift using the gear selector (start in L or 1, shift to 2, then D)?

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170

Tuffer answered 6 years ago

No it still won't shift into drive or OD..

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