Jklee 1 Posted April 17, 2012 I am trying to figure out a strange grinding/vibration coming from my jeep while at freeway speeds. I thought it was my old transfer case that broke but even with the new swap I have it. George suggested to look for play in yokes at transfer case but there is none. The new driveshafts are balanced and so are the tires. My exhaust is trashed but I don't believe that's it. Finally I get to the question: If the gears in my front dif are slightly different that the rear would that cause this? I bought the front hp30 already set up with 4:10 gears and a lockright so I had the 8.8 built to match. But what if what I bought wasn't 4:10. Could this be it? Thanks again your guys rock Share this post Link to post Share on other sites
Number7 89 Posted April 17, 2012 Take the front drive shaft off and drive it. If it still does it put it back on and take the back one off and drive it. this way you can figure out if your problem is front end or the rear. George:cool: Share this post Link to post Share on other sites
Jklee 1 Posted April 17, 2012 Man do I feel stupid for not doing that.........so simple. Thank u lol Share this post Link to post Share on other sites
Avis 2 Posted April 17, 2012 Before you pull the drive shaft, is your jeep an all time 4wheeldrive? or does it have the 2wd option? IF it's all time 4wheeldrive do NOT drive it with one drive shaft out, you will ruin the transfercase. Share this post Link to post Share on other sites
Jklee 1 Posted April 17, 2012 I had a 242 before and swaped in a 231 recently so that shouldn't be an issue. Share this post Link to post Share on other sites
ob1jeeper 849 Posted April 17, 2012 Is the noise/vibration speed or throttle sensitive? Or is it both? Take notice of speeds, throttle application, and/or any other thing that produces it, or makes it worse, and let us know what you find... MUCH easier to diagnose when you have pertinent information... Share this post Link to post Share on other sites
Jklee 1 Posted April 18, 2012 It seems to be the most prevalent when I let of the gas at high speed and coast. My brother took the front drive shaft out today, I am waiting to hear what he heard. Share this post Link to post Share on other sites
ob1jeeper 849 Posted April 18, 2012 Throttle sensitive vibrations are usually driveline u-joint related, and typically are either; - worn - dry (lacking lube) - or mis-matched driveline angles. Less likely, but other things that can produce noise/vibration which are are throttle sensitive are; - Exhaust (usually poor routing, or broken/missing hangers) AND... - Drivetrain internals; axles, t-case, trans, engine. And least likely, but certianly not out of the question; - Accessory drives can produce noise/vibrations which are throttle sensitive From your description, I'm gonna guess driveline u-joint related... Let us know what you find... Share this post Link to post Share on other sites
JWFAB 0 Posted April 21, 2012 Are your pinion angles correct? If yes, I'll say u-joints in ds or as or possibly unit bearings. Share this post Link to post Share on other sites
