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1998 GMC Yukon won’t shift

DabigchezzDabigchezz Member Posts: 1
edited November 2018 in GMC
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
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    MS_GcantLetGo1YukonMS_GcantLetGo1Yukon Member Posts: 1
    edited September 2020
    My 01 Yukon wont go over 20mph...it jerks up to 25 or so for a second. I had a remanufactured trans put in a year and a half ago. Can someone please advise?
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