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First time poster here. My son's 2007 GMC Silverado single cab, 2wd automatic started having issues last night. He was taking off from a stop light turning right and lost the gear. When in Drive, it does nothing. When manually shifted into 1st it takes off fine. When shifted into 2nd it takes off fine even from a standstill. Shifting from 2nd to 3rd manually will not happen until about 20 mph (could be prevented by the computer). You can manually shift thru all of the gears and get up to speed. When I shift from 2nd to 3rd the engine revs as tho in neutral then slowly catches the gear and engages. I can shift from 3rd to D and it will do the same thing - rev and then slowly catch the gear and engage.

 

I have an OBDII reader but nothing is coding.

 

Don't know if I have given enough info here or if I even sound lucid but I would appreciate any help!

 

Thank you!

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