Service 4WD on 2003 2500HD with 8.1 NP263 case
March 5th, 2022, 8:56 AM
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Service 4WD on 2003 2500HD with 8.1 NP263 case
Hello All,
Throwing out a question on my issue with the 4wd on a Chevy 2003 2500HD with the 8.1/Allison and a NP 263 transfer case. It will not go into 4wd, 3 button panel, no auto. Push 4H and it flashes with the 2H and then puts "service 4wd" on dash. So...I thought I did not hear t-case motor, so I did replace that. it went well. When that did not work, I changed the front differential motor, that did not do it either. I saw a note on cleaning the ground wires under the frame, and they were not good, (Minnesota salt), that did not seem to change anything either. I thing I can hear both motors when you hit 4wd. I can hit 4wL and get low range. I tied a zip tie to the front driveshaft and it flaps when I drive in 4wd. Driveway is all snow and I can tell 4wd is not engaged. When inside and motor off, I can hear both motors when I hit 4wd. So It was late and had to walk away from it. I hope I explained the issue well enough and that maybe someone has some direction for me to look. Anyway, thanks and take care from TF MN. Brad
Throwing out a question on my issue with the 4wd on a Chevy 2003 2500HD with the 8.1/Allison and a NP 263 transfer case. It will not go into 4wd, 3 button panel, no auto. Push 4H and it flashes with the 2H and then puts "service 4wd" on dash. So...I thought I did not hear t-case motor, so I did replace that. it went well. When that did not work, I changed the front differential motor, that did not do it either. I saw a note on cleaning the ground wires under the frame, and they were not good, (Minnesota salt), that did not seem to change anything either. I thing I can hear both motors when you hit 4wd. I can hit 4wL and get low range. I tied a zip tie to the front driveshaft and it flaps when I drive in 4wd. Driveway is all snow and I can tell 4wd is not engaged. When inside and motor off, I can hear both motors when I hit 4wd. So It was late and had to walk away from it. I hope I explained the issue well enough and that maybe someone has some direction for me to look. Anyway, thanks and take care from TF MN. Brad
March 6th, 2022, 6:16 PM
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Problem is fixed!
It ended up being the ground wires down under the door. I did clean them and nothing changed. But then I cut the terminals off and cleaned up the badly oxidized copper and soldered new terminals on. I used new bolts and star washers and ground down to bare metal. Coated it with a spray and it all worked!
Thanks! Take care.
It ended up being the ground wires down under the door. I did clean them and nothing changed. But then I cut the terminals off and cleaned up the badly oxidized copper and soldered new terminals on. I used new bolts and star washers and ground down to bare metal. Coated it with a spray and it all worked!
Thanks! Take care.
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