Roaring rear differental

We checked with a stethescope tonight...Gonna replace the fluid with Lucas and start from there...

 

If it's really bad, fluid ain't gonna fix it...at least not for long.

I had a bearing or two go in mine a few years back...ended up having to replace the entire center section. It wasn't the funnest job, but it's been quiet ever since.

 

what makes you think using Lucas oil will stop a roaring rear

 

If the bearings went, no point in delaying the inevitable. Order a replacement 3rd member from ECGS and send yours back as core.

 

That's exactly how I fixed mine...couldn't have been any easier, and the one they sent me was dead silent.

 

Thanks Guys, I was only hoping for the fluid to be the answer..1st time into this problem..I'll probably do what yall are suggesting..I am pretty sure at this point, ur right..I'll post more as I get to it..I vaguely remember a thread that left me thinking there were some rear end problems anyway..Just want to find out first..Thanks

 

Hey Guys, Could you explain a little more in laymans terms ? I have an 07 Prerunner, V6, 2wd...138,000...I did find the tread talking about a weak spot there...And I really need to figure out if I this is surely the problem before I go and spend possible big bucks..Thanks again !

 

Try putting the rear end on jack stands. Have a friend turn the rear wheels by hand, while you were checking and listening for where the noise is coming from. Or take it to a shop you trust and have them verify the problem.
I had just under 300,000 miles on mine before I had to replace my rear diff. About 335,000 miles I had the rear right side axle bearing and seal go.

 

use a non synthetic gear oil

 

Cheaper fix than using Lucas oil is just to the radio volume up. You’ll get the same result as using Lucas Oil and for a lot less money.

 

That gear oil was only $6.99 qt...And Walmart was out...Got Valvoline for $ 12.99 instead...lol

 

Thanks Poolguy. That sounds good to me..We had it in the air last night but I was running the engine...Plus 10 other folks drinking my beer..All i got done was change the gear oil for no reason...The old fluid looked like honey...

 

if you got a mechanical LSD the synthetic oil is NADA

 

Are the U joints greasable? If so when you last grease them?

 

PreRunner didn't have greaseable U-joints, if I remember correctly.

 

Maybe they are just bad or if it has a center bearing too?

 

Yes, the driveshaft carrier bearing and wheel bearings can go bad (and more likely than diff bearings). However, @MyMule's OP said he checked it with a stethoscope already.

 

I'd like to see a stethoscope used on a turning U joint. lol

 

Lol you'd put the probe on the round part of the yoke... In any case it isn't hard to rule out: Unbolt the driveshaft from the pinion flange, spin the wheels. If the noise is still there, the noise can't come from any driveshaft component.