My Tahoe drives in 1 and 2 but does not drive in d...IT DOES BACK UP PROPERLY...WHAT CAN BE THE PROBLEM
Hello - most likely problem for this "no go" condition is a failure of the forward sprag (a one-way clutch) in the transmission. I would recommend a transmission inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
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