Drive Train Noise

So know that I have the 55 on the road, I have been driving it quite a bit the last two days. When driving under throttle the drive train is quite as a mouse, but as soon as I let off the throttle there is a loud "growling" noise coming from under the jeep, I assume it means TC needs to be rebuilt, but it has less that 15k miles on it?? Just curious if it could be anything else, the fluid in the tranny and TC is fresh, but not in the diffs.

 

nope just third when cruising along at normal speeds, then when I let off to coast it makes the noise/vibration

 

Yeah, I was going to guess axle noise. You can try removing the rear driveshaft, driving on the front axle, to see if it goes away.

And drive in 3rd gear/low range to see if it's speed related.

 

Copied from randys r&p site

 

How easy is it to replace he pinion bearing in these?

 

pull the rear axles out, remove carrier, unbolt pinion, knock out, change races, press new bearings on and put back together. Check pinion preload, and gear pattern....if good put it all back together.

 

Sounds easy but be forewarned, Dana's are a pain in the rear to set up. Since the carrier has to be removed to get the pinion out, a case expander tool makes this task much easier than the crow bar method. You should not have to mess with the carrier shim packs but you well may have to adjust the pinion shims (get a shim pack assortment). The preload is also very important and requires an accurate inch-lb torque wrench in the 10 to 25 ft-lb range. You can significantly decrease the pinion bearing life by either too little or too much preload. Get a copy of a factory service manual as the proceedures are described very well in all of them. As previously noted, growling on deceleration is a classic symptom of pinion bearing problems.

 

is it coming from the axle or from the t-case?

My model 18 wines like hell-- it (and the one I had in before it) wines like hell on de-acceleration. It also does at 'drivetrain float'. (I'm sure it needs rebuilding).

 

mine too

 

I found my output shaft and output gear was worn. This caused my noise from the transfer case.

 

Sorry for chiming in so late, haven't been here for awhile. Mine had a similar sound and I found the driveshaft yokes were miss-aligned. Was very easy to check and correct. Might be something to check out.

 

Well, guess what when your rear U joint is so bad it wore three of the four caps right of you get a little bit of noise

Can't believe I missed it, but when I went and checked the U joints before I even posted this question I thought I checked them all, but my phone rang and I guess I never checked the last oneR)

30 bucks later and she is as quite as a 13k mile drive train should be....smooth as silk

 

nothing better than an easy fix!