Israel
NAXJA Forum User
- Location
- Spanish Fahrk, Utah
I just swapped a used NP231 with AA SYE in my jeep and when I drive with the rear shaft in, there is a bad vibration at only 15 to 20 mph. I haven't gone much faster because it's rough enough that I worry about something coming apart at higher speeds.
The history is that I swapped in a rear JK Rubicon axle that had a 1350 yoke on it. I installed a 1310 to 1350 conversion joint in my stock driveshaft with the slip yoke and drove it for about 2 weeks with just a slight vibration above 40-45 mph. I had pointed the pinion right at the current transfer case in preparation for the NP231 w/SYE, so a little vibration was to be expected since it should have been pointed lower.
I then swapped in a used NP231 that already had a SYE installed. When I took it out for its first drive, I couldn't even get it out of the neighborhood, the vibration was so bad. I thought the double cardan joint was bad on my used shaft since it wasn't as stiff as what I'm accustomed to, so I had a Tom Woods shaft that had only a couple thousand miles on it lengthened to work in the jeep. I put the newly retubed and balanced Tom Woods shaft in last night and the vibration is still there. I put the other shaft in again just for kicks, and the vibration feels the same between the two shafts.
I can drive on the front shaft only with no vibration at all.
I think I'm down to two possibilities:
1. Both shafts that I'm using are out of balance or in need of a rebuild.
2. The output bearing on the t-case is bad even though the yoke feels tight.
Am I missing any other possibilities?
The history is that I swapped in a rear JK Rubicon axle that had a 1350 yoke on it. I installed a 1310 to 1350 conversion joint in my stock driveshaft with the slip yoke and drove it for about 2 weeks with just a slight vibration above 40-45 mph. I had pointed the pinion right at the current transfer case in preparation for the NP231 w/SYE, so a little vibration was to be expected since it should have been pointed lower.
I then swapped in a used NP231 that already had a SYE installed. When I took it out for its first drive, I couldn't even get it out of the neighborhood, the vibration was so bad. I thought the double cardan joint was bad on my used shaft since it wasn't as stiff as what I'm accustomed to, so I had a Tom Woods shaft that had only a couple thousand miles on it lengthened to work in the jeep. I put the newly retubed and balanced Tom Woods shaft in last night and the vibration is still there. I put the other shaft in again just for kicks, and the vibration feels the same between the two shafts.
I can drive on the front shaft only with no vibration at all.
I think I'm down to two possibilities:
1. Both shafts that I'm using are out of balance or in need of a rebuild.
2. The output bearing on the t-case is bad even though the yoke feels tight.
Am I missing any other possibilities?