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1998 GMC Yukon won’t shift
I bought a 1998 GMC Yukon with a bad transmission, so i bought a used transmission I knew wasn’t bad with only 90k and put it in. I also replaced the transfer case. But the transmission will not shift in drive it only stays in 1st but if I put it in manual it will shift from 1st to 2nd but won’t go into 3rd or 4th. I changed the A and B shift solenoids but it did nothing. I unplugged the transmission case connector to see if the 3rd clutch was good and the clutches are good. Someone please tell me what’s going on