onespiritbrain Posted October 25, 2019 Share Posted October 25, 2019 (edited) So a few days ago I went off-roading for the first time in a while. I didnt use 4WD and did have some free wheeling at the rear on the way off the trail. First I noticed a significant whine, about as high pitched as a deep males voice will go, at 50-60mph under heavy acceleration load (up a hill). Now the same whine is present when taking off from stop and increases in loudness until about 25mph and begins to taper off until 40mph where I can barely hear it. It still reappears sharply at 50mph going up hills. I would like to pinpoint the offending area. I hope its the transfer case since I have one sitting in my storage building but I fear its actually the rear diff. I do also have a slight rumble that is load dependent (more pronounced with greater load) that begins at 40mph and peaks at 50mph before tapering off to nothing by 65mph. I do not notice a change in the whine while taking curves. 70+mph speeds are silent and completely smooth. I plan to check fluids in both the rear end and transfer case tonight. Edited October 25, 2019 by onespiritbrain Link to comment Share on other sites More sharing options...
onespiritbrain Posted October 25, 2019 Author Share Posted October 25, 2019 I assume that amount is abnormal? I changed the drain plug out for one I have at work but there’s no magnet. I suspect there’s more metal in there than what can held on that little magnet anyway but I am just picturing newly freed shavings making their way into the mesh.. Is it of any benefit to change the fluid at this point? 1 Link to comment Share on other sites More sharing options...
onespiritbrain Posted October 25, 2019 Author Share Posted October 25, 2019 Actually I just wiped what looked like shavings from the magnet and it was metal paste formed into spikes. So no visible shavings thus far. I have to get home and I’ll dig in tomorrow. Link to comment Share on other sites More sharing options...
onespiritbrain Posted October 26, 2019 Author Share Posted October 26, 2019 No whining at all on the way home.... not complaining or anything. Rumbling was still present. The rumbling is not intense enough to rattle anything inside the vehicle but it does shake my side mirrors enough to where it’s hard to make out details, like what kind of car is about to pass my slow butt. Link to comment Share on other sites More sharing options...
onespiritbrain Posted October 26, 2019 Author Share Posted October 26, 2019 These are all the ring gearThis is the only good shot I could get of the pinion gear The oil smells like burnt clutch and is pretty dark but doesn’t not contain any metal shavings. Front is coming next. Link to comment Share on other sites More sharing options...
onespiritbrain Posted October 26, 2019 Author Share Posted October 26, 2019 Front diff oil was much darker. I think the rear oil looked darker because it had clutch material in it. Link to comment Share on other sites More sharing options...
onespiritbrain Posted November 4, 2019 Author Share Posted November 4, 2019 For information purposes this issue was caused by low tire pressure. Link to comment Share on other sites More sharing options...
onespiritbrain Posted November 4, 2019 Author Share Posted November 4, 2019 Double post Link to comment Share on other sites More sharing options...
Mrelcocko Posted November 4, 2019 Share Posted November 4, 2019 So the rumble was due to incorrect tire pressure? I just replaced the rear diff entire axle on my 96 and I too have a rumble when going around curves. What size tire are you running along with pressure? My rear differential oil smelled the same as you described when I changed mine.Sent from my SM-S367VL using Tapatalk Link to comment Share on other sites More sharing options...
onespiritbrain Posted November 4, 2019 Author Share Posted November 4, 2019 The rumble is still there. I think it’s from the ujoints I replaced not long ago. They have play when shaken by hand. Link to comment Share on other sites More sharing options...
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