The 5.29 Mega Thread!!

Great! I’ll just keep on the watch list. Hopefully it doesn’t grow

 

@socalexpeditions

Looks like mostly 85w-140

 

I need to swap over to 85w-140 and see if that helps get rid of my noise some. Currently running

$29 75w-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75w-90.

 

I’ve ran 85w-140 since my regear and haven’t had any noise

 

Man, that must be nice. I doubt it’ll help, but it’s worth a shot.

 

My truck at 75mph off throttle sounds like a Boeing haha. Gears are fine though, wear is perfect. Just a nitro thing

 

My Yukons do the same, plus some noise in the 30’s.

 

Mine noise is exhaust drone

 

So, long time lurker to the thread. Finally pulled the trigger on some 5.29 first off I have a 2018 OR w/auto and 33” tires. Running straight on factory gears was just horrible. If anyone says it’s not bad they are lying. Don’t trust them. Needless to say I went with the 5.29 over the 4.88 because I do plan on going 35” tires but pulling a offroad trailer they just made sense. I’m still in the break in period, so haven’t got to try the trailer out but initial review. They are night and day compared to the stock, mileage is around 15, so I do expect that to remain. Shift points are so much better, no more hunting for the gear and I can finally run 6th again. So if anyone is thinking of the 5.29 over 4.88. If you are running bigger than facotry sized just get the damn 5.29

 

Going to try & make this short & sweet...Had my 5.29 Nitros installed in fall last year, everything ran & functions perfect. Did my 500 mile fluid swap front & rear. Again everything is just fine. Drove up to Lake Tahoe for a weekend about a month after doing the fluid change. Strictly HWY driving (no trails no 4WD) came back home & have oil allll over underneath from the upper control arm, strut, cv, frame, cross member all over the wheel well. Followed the trail of fluid up to under my hood to the breather tube. Figured I may have over filled my front diff. So I popped the fill plug to have any excess fluid drip out & even jacked up the front passenger side of the truck to tilt it over to help a little. Cleaned it all up, been good since then. No more drips or oil covering the underneath...drove back up to Tahoe again this past weekend. Again strictly HWY driving, park in the parking garage. Come back the next day & small puddle gear oil under my truck coming from my front diff breather tube again...at this point I can’t understand what’s making this happen besides the high elevation. Sounds dumb but I don’t know what else could be making this happen. I don’t have issues when I’m in my hometown & drive every day with my truck and nothing happens. But when I go high up in elevation it’s spitting out the breather tube....any ideas guys?!?

 

What fluid?
Do you have a front locker?
Aftermarket breather and lines?
Did you even use 4WD at the passes?

 

My front diff fluid...85w140
No front locker
No aftermarket parts either
HWY’s were clear so no 4WD necessary.

2019 TRD sport 4WD DCLB

 

Has to be because of altitude then. I can't see any reason beside the air pressure being different that would allow oil to travel up the breather.

 

I would drain for a goodly while and refill just to bottom of fill bolt, normal fill level with 75W-90.

Altitude I suppose. Seems quite odd.

 

That’s thee only thing I can think of. Pretty weird for that to happen but I’m an amateur at this. Learning as I go. Glad I’m not the only one who thinks that

 

I live at 7k feet. Been through the passes in CO. Alpine loop Omogene etc.
I haven’t had any blow out like you.

 

Odd, I have never seen it blow out in elevation

 

The passes are higher than that for sure. 9K-10K+. But still yeah, unless overfilled and over heated shouldn't blow fluid. XXW-140 will cause the differential to run really hot. Frictional heat from overly viscous fluid in a differential is a real thing. No sense at all running 140 in the front. Buys nothing.

People never listen to me though.

 

I have Nitro 5.29’s with 35’s - 2017 Tacoma... Driving down the street 40 mph my gears blew out out, and destroyed a bearing and the pinion. Gears are only 7 months old... Shop that installed them is telling me its a freak incident and no warranty. One month ago I was on a road that require 4WD but nothing radical... they claim I must have done something then and it finally blew up...now they ant $2500 for new gears to fix.... my gut says BS...Thoughts anyone?

 

nitro has a year warranty i think