I was rolling under the Jeep to check jam nuts, etc. I installed driveshafts a few months ago with replacement flanges. I gave the front flange at the transfer case a shake to see if anything felt loose. There is obivously some rotational spin before the front diff locks, but there is a slight up and down movement (very slight) to the flange. Just for laughs (actually no laughs), I pulled the skid plate, pulled the DS off and checked the torque of the xfer case nut. It was still torqued at the 90 - 100 ftlbs.

Has anyone else gotten this particular. Just wondering if the slight up and down is normal. Would I have to take the nut totally off and then retorque to get an accurate reading (I don't think so). I never really totally got rid of a slight vib at 55-60 mph, but I have grown to accept it.

 

Hold on I'll go check. I wonder if that's the cause of your vibe. I have no vibes even with the stock shafts.

 

I have no play on the rear flange. There is slight play on the front. It's just a little play and you get a little click or tap noise while shaking it. So it sounds like you're normal. Well maybe not you, but your rig

 

Mine has a touch of up and down in the front as well. Strange, but I guess that's normal.

 

Thanks guys! How paranoid can one be? Instant info - priceless!

 

Same here.

 

So, does it plunge in and out? Mine did it awhile back and caused nasty driveline vibe. I had to have a new crush sleeve put in and the shaft fixed. Pinion nut loosened up.