Red91Laredo
NAXJA Forum User
- Location
- Portland, Oregon
My NP242 is making some odd noises and I'm wondering how concerned I should be about them. First, when I have spin the front driveshaft/front input shaft by hand with the case in 2wd I can easily hear what sounds to me like the chain moving inside the case. The noise seems normal enough, other than the fact that I can hear it so clearly. It sounds like a very big bicycle chain spinning. My alignment shop first pointed this out to me as something that may not be a normal noise, but they're not drivetrain guys so they weren't sure.
Secondly, when driving below 10 or 15 mph I hear a kind of "chuff-chuff-chuff" sound that seems to correlate to each turn of the driveshaft. I thought it was a front wheel bearing or u-joint going out until I noticed the sound had vanished when I had to move the Jeep with the rear driveshaft removed the other day. I just drove it around the block in 4-hi part time so I could pull it into my other driveway and the sound was gone.
Finally, I've recently noticed my rear output shaft can move in and out (back and forth) about 1/8". I have IRO hack-n-tap SYE installed, otherwise I probably wouldn't have been able to notice this. I'm just speculating but it doesn't seem like it should move quite that much.
I've been fighting driveline vibes since I lifted the Jeep 4.5" and am starting to wonder if my t-case may be causing or at least contributing to them. When I bought the Jeep with 145k on it I changed the fluid and it was filthy, as black as ink. It doesn't make any odd noises in 4WD as far as I've noticed. The Jeep is my daily driver so 99% of my driving is in 2WD but I usually put it in full time mode on extremely rainy days when the streets are slick. It's a bit tricky to shift into 4-hi full time and back into 2WD, usually wants to shift into 4-hi part time and stay there, but I use 4WD so infrequently I haven't checked if maybe the linkage just needs adjusting.
The Jeep is a '91 and I'm running a stock front shaft in the rear along with the aforementioned SYE. It's been making both weird noises since I got it bone stock a year and a half ago. I've put 20k miles on it since then. Any thoughts?
Secondly, when driving below 10 or 15 mph I hear a kind of "chuff-chuff-chuff" sound that seems to correlate to each turn of the driveshaft. I thought it was a front wheel bearing or u-joint going out until I noticed the sound had vanished when I had to move the Jeep with the rear driveshaft removed the other day. I just drove it around the block in 4-hi part time so I could pull it into my other driveway and the sound was gone.
Finally, I've recently noticed my rear output shaft can move in and out (back and forth) about 1/8". I have IRO hack-n-tap SYE installed, otherwise I probably wouldn't have been able to notice this. I'm just speculating but it doesn't seem like it should move quite that much.
I've been fighting driveline vibes since I lifted the Jeep 4.5" and am starting to wonder if my t-case may be causing or at least contributing to them. When I bought the Jeep with 145k on it I changed the fluid and it was filthy, as black as ink. It doesn't make any odd noises in 4WD as far as I've noticed. The Jeep is my daily driver so 99% of my driving is in 2WD but I usually put it in full time mode on extremely rainy days when the streets are slick. It's a bit tricky to shift into 4-hi full time and back into 2WD, usually wants to shift into 4-hi part time and stay there, but I use 4WD so infrequently I haven't checked if maybe the linkage just needs adjusting.
The Jeep is a '91 and I'm running a stock front shaft in the rear along with the aforementioned SYE. It's been making both weird noises since I got it bone stock a year and a half ago. I've put 20k miles on it since then. Any thoughts?
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