won't shift into 4 low
November 2nd, 2020, 9:00 PM
#1
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won't shift into 4 low
2001 Suburban
I have the NP8 4 button transfer case. 2HI and 4Hi work. Rig won't shift into 4 low, I got the 'Cannot complete shift' error code. I pulled encoder motor off and tried it hanging loose. The motor went to 4LO and back with no problem. I put a wrench on the shifter shaft and tried to turn it by hand. Very hard to turn but I did get it to click into some kind of different position. How hard is it supposed to be to turn this shaft I wonder?
I have the NP8 4 button transfer case. 2HI and 4Hi work. Rig won't shift into 4 low, I got the 'Cannot complete shift' error code. I pulled encoder motor off and tried it hanging loose. The motor went to 4LO and back with no problem. I put a wrench on the shifter shaft and tried to turn it by hand. Very hard to turn but I did get it to click into some kind of different position. How hard is it supposed to be to turn this shaft I wonder?
November 3rd, 2020, 10:11 AM
#3
First: Welcome to the forum from Oregon.
How often do you shift the encoder motor between the different settings? If you do it only in the cold snowy weather then you may have caused the problem. Needs to be cycled periodically even in warm weather.
Gonna have to try and free that shaft up and lube it but you should also change the diff fluid after all that.
How often do you shift the encoder motor between the different settings? If you do it only in the cold snowy weather then you may have caused the problem. Needs to be cycled periodically even in warm weather.
Gonna have to try and free that shaft up and lube it but you should also change the diff fluid after all that.
Last edited by PNW NBS Z71; November 3rd, 2020 at 11:10 AM.
November 3rd, 2020, 10:58 AM
#4
CF Monarch
How often do you shift the encoder motor between the different settings? If you do it only in the cold snowy weather then you may have caused the problem. Needs to be cycled periodically even in warm weather.
Gonna have to try and free that shaft up and lube it but you should also change the diff fluid after all that.
Gonna have to try and free that shaft up and lube it but you should also change the diff fluid after all that.
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PNW NBS Z71 (November 3rd, 2020)
November 3rd, 2020, 11:10 AM
#5
I used to live in KC, Mo. before I moved here to Oregon 25 years ago. I lived in Gladstone, north of the river and my brother still lives there in Parkville, again north of the river and he works at the Ford Assembly Plant in Claycomo.
Getting ready to start getting real cold there, snow on the ground and that dreaded salt on the roads. I ran shops there for years.
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Rednucleus (November 4th, 2020)
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