Blown differential

jacobe92 · 06-22-2019, 08:29 PM

Initially, I just thought the noise that was coming underneath the car was from a big size pebble stuck on my slicks and was rubbing the plastic wheel liners. Finally got around to removing the wheels to investigate and this is what I see.

Suds · 06-22-2019, 08:56 PM

Damn!

NYG · 06-22-2019, 08:56 PM

I don't see anything wrong with the rear axle just your diff fluid all over the place. Looks like a seal between the drive shaft and rear end blew?

Brasko · 06-22-2019, 10:21 PM

Maybe just overheating/excessive temperatures during a track session?

Hopefully it isn't serious.

icegrill · 06-22-2019, 10:26 PM

That's some thick ass fluid

damageprone · 06-22-2019, 11:17 PM

Quote:

Originally Posted by NYG

I don't see anything wrong with the rear axle just your diff fluid all over the place. Looks like a seal between the drive shaft and rear end blew?

This. I believe a few cars have had this issue replaced under warranty. Although the fluid didn’t look like that.

paliknight · 06-23-2019, 01:38 AM

Isn't your car under warranty? Or you're trying to avoid the dealership because of mods?

jacobe92 · 06-23-2019, 09:02 AM

Quote:

Originally Posted by NYG

I don't see anything wrong with the rear axle just your diff fluid all over the place. Looks like a seal between the drive shaft and rear end blew?

Quote:

Originally Posted by paliknight

Isn't your car under warranty? Or you're trying to avoid the dealership because of mods?

Quote:

Originally Posted by Brasko

Maybe just overheating/excessive temperatures during a track session?

Hopefully it isn't serious.

Differential Fluid has the same weight as brake fluid, this looks similar to motor oil. But again, the exhaust shows that the fluid was thin at one time when it was hot, but when it sat in my garage for a week became thick.

I sent photos to my mechanic and he also thinks the Rear Axle is toast since it was making a rubbing noise while I was driving around town. He thinks the CV Joint needs to be rebuilt at best. Well, we all know Stealerships replace parts and not rebuild them.

I'm not trying to skirt the dealership because I'm heavily modded and I'm afraid it be denied warranty. There has be to direct correlation with the part damage, and the mods installed to be denied warranty. Example, above normal horsepower or torque brought by a "Tune" equals a Blown Axle? Nope! So no connection between the two so I'm not afraid of warranty being denied. It's how everyone should rationalize warranty.

chrisjguzman · 06-23-2019, 09:53 AM

Quote:

Originally Posted by jacobe92

Quote:

Originally Posted by NYG

I don't see anything wrong with the rear axle just your diff fluid all over the place. Looks like a seal between the drive shaft and rear end blew?

Quote:

Originally Posted by paliknight

Isn't your car under warranty? Or you're trying to avoid the dealership because of mods?

Quote:

Originally Posted by Brasko

Maybe just overheating/excessive temperatures during a track session?

Hopefully it isn't serious.

Differential Fluid has the same weight as brake fluid, this looks similar to motor oil. But again, the exhaust shows that the fluid was thin at one time when it was hot, but when it sat in my garage for a week became thick.

I sent photos to my mechanic and he also thinks the Rear Axle is toast since it was making a rubbing noise while I was driving around town. He thinks the CV Boot needs to be rebuilt at best. Well, we all know Stealerships replace parts and not rebuild them.

I'm not trying to skirt the dealership because I'm heavily modded and I'm afraid it be denied warranty. There has be to direct correlation with the part damage, and the mods installed to be denied warranty. Example, above normal horsepower or torque brought by a "Tune" equals a Blown Axle? I don't have tune. It's how I rationalize warranty.

It's definitely the CV boot

SakhirM4 · 06-23-2019, 10:10 AM

Quote:

Originally Posted by chrisjguzman

It's definitely the CV boot

CV Boot is just a piece of rubber. Guess you meant CV joint.

Soylent · 06-23-2019, 01:30 PM

A torn boot will throw grease.

DML · 06-23-2019, 01:55 PM

Can't wait to hear how the dealership "rationalizes". Sincerely, good luck

Sedan_Clan · 06-23-2019, 03:49 PM

Subscribed!

N1rve · 06-24-2019, 02:07 AM

That looks more like CV Joint grease more than diff fluid.

RoundelM3 · 06-24-2019, 07:48 AM

Quote:

Originally Posted by damageprone

This. I believe a few cars have had this issue replaced under warranty. Although the fluid didn’t look like that.

Yep, I just had this done - 2 weeks before my warranty expired!

chmura · 06-24-2019, 10:57 AM

This is simply grease and not differential fluid. Your diff is fine.

There is thick grease inside the black CV boot that lubricates ball bearings, etc. Looks like that clamp maybe loosened and grease escaped under the boot.

You can simply reboot the CV axle and put new packing grease, but since its under warranty just throw in a new axle. Not hard to do.

08mojo · 06-25-2019, 06:34 AM

Definitely an axle problem, not the differential. The CV joint boot failed (or the CV joint failed and tore the boot). That's axle grease not differential oil, plus it's coming out around the CV boot. Differential oil would come out between the diff and the axle, so further inbound.

Regardless, love the Forgelines!

jacobe92 · 06-25-2019, 10:06 AM

Quote:

Originally Posted by 08mojo

Definitely an axle problem, not the differential. The CV joint boot failed (or the CV joint failed and tore the boot). That's axle grease not differential oil, plus it's coming out around the CV boot. Differential oil would come out between the diff and the axle, so further inbound.

Regardless, love the Forgelines!

I also think it's just the Rear Axle that's toast and not the Differential. Just FYI, my Differential was replaced 4 months ago and the sound of that was entirely different. That was more of a thumping noise and not like a rubbing and whinny sound like this one.

I find it strange that not a lot people know about the Forgeline brand in this BMW forum. Plenty of people will actually chose the HRE etc, etc. over it. Shown in the photo is my square 18x10 Et 27 Forgeline GTD1. Thanks!

jacobe92 · 06-25-2019, 11:06 AM

Dropped off at the hospital this morning...

chmura · 06-26-2019, 09:41 AM

Quote:

Originally Posted by jacobe92

Dropped off at the hospital this morning...

Thats a sweet looking ride! Wonder if those wheels in 19" will work on an M2c.

Fortyb · 06-27-2019, 08:17 AM

Subscribed!

jacobe92 · 06-27-2019, 10:37 AM

Quote:

Originally Posted by chmura

Quote:

Originally Posted by jacobe92

Dropped off at the hospital this morning...

Thats a sweet looking ride! Wonder if those wheels in 19" will work on an M2c.

Quote:

Originally Posted by Fortyb

Subscribed!

It should. The GS1R are forged, made to order wheels. It means they can make it in 18" or 19's, accommodate BBK with custom offset to fit any car.

Thanks

06-22-2019, 08:29 PM	#1
jacobe92 Major 619 Rep 1,239 Posts Drives: 2016 Hell Rot F80 M3 Join Date: Aug 2010 Location: California iTrader: (6)	Blown differential Initially, I just thought the noise that was coming underneath the car was from a big size pebble stuck on my slicks and was rubbing the plastic wheel liners. Finally got around to removing the wheels to investigate and this is what I see. Attached Images __________________ 2016 Hellrot F80 M3\|JRZ RS Pro with Swift Springs 550/750 spring rates l AP Radical 5000R 9668/9449 lSpiegler SS LinesI DS1.11I Eisenmann DP\|MPE Catback\|18" Forgeline GS1R 18x10 et 22 and 18x11 et 44 NT01 275/35/18 and 305/35/18\| Forgeline GTD1 18x10et43 SquarelM Performance Lip/Splitter\|IND aesthetic mods\|Dinan Toe Link\|Fall Line mono ball conversion kit and upper link kit\| Aim Solo 2DL Smarty Cam\|Simpson Hybrid\|Stilo Offshore helmet.
	Appreciate 0 Tweet Quote

06-22-2019, 08:56 PM	#2
Suds /M Enthusiast 1597 Rep 1,617 Posts Drives: Responsiblish Join Date: Aug 2010 Location: Lone Star State iTrader: (1)	Damn! __________________ 2019 M2 Comp, Alpine White, DCT, track car build, 1/2 cage, AP Racing Brakes & Nitron Coilovers, BM3 Stage 1 93 Oct. 2018 Porsche Cayman GTS, Night Blue Metalic, PDK, COBB tuned 93 Oct. 2004 Audi A4 Avant USP 6mt, RS4 clutch, built motor, Garrett GT3071r "Big Ass Turbo" Motoza Tune
	Appreciate 1 MisterF80M31045.50 Quote

06-22-2019, 08:56 PM	#3
NYG Brigadier General 10580 Rep 3,643 Posts Drives: Corvette Z06 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	I don't see anything wrong with the rear axle just your diff fluid all over the place. Looks like a seal between the drive shaft and rear end blew?
	Appreciate 0 Quote

06-22-2019, 10:21 PM	#4
Brasko #LSBM3 1419 Rep 1,973 Posts Drives: 2016 BMW M3 Join Date: Feb 2015 Location: Oregon / Florida iTrader: (4) Garage List 1984 BMW R65 [0.00] 2020 Ford F-150 XLT ... [0.00] 2003 Mitsubishi Evo ... [0.00] 2016 M3 Competition ... [10.00]	Maybe just overheating/excessive temperatures during a track session? Hopefully it isn't serious. __________________ /// M3
	Appreciate 0 Quote

06-22-2019, 10:26 PM	#5
icegrill Lieutenant Colonel 2078 Rep 1,779 Posts Drives: 2015 M3 Join Date: Jan 2018 Location: Oregon iTrader: (3)	That's some thick ass fluid
	Appreciate 1 MisterF80M31045.50 Quote

06-23-2019, 01:38 AM	#7
paliknight fuck this field 2192 Rep 2,605 Posts Drives: 18 F80 CS/18 F80 ZCP/19 M2C Join Date: Aug 2014 Location: everywhere iTrader: (1)	Isn't your car under warranty? Or you're trying to avoid the dealership because of mods? __________________ BMW family... for now.
	Appreciate 0 Quote

06-23-2019, 01:30 PM	#11
Soylent Major 960 Rep 1,068 Posts Drives: 2021 M4C Join Date: Jul 2009 Location: California iTrader: (0)	A torn boot will throw grease.
	Appreciate 1 ellipsis2121617.50 Quote

06-23-2019, 01:55 PM	#12
DML Colonel 968 Rep 2,017 Posts Drives: 2020 Heritage Join Date: Feb 2013 Location: Darien CT. iTrader: (0)	Can't wait to hear how the dealership "rationalizes". Sincerely, good luck
	Appreciate 0 Quote

06-23-2019, 03:49 PM	#13
Sedan_Clan Law Enforcer 24967 Rep 22,264 Posts Drives: '22 Chalk Gray Porsche C2S Join Date: Jun 2006 Location: ..in your rearview!!! iTrader: (26)	Subscribed!
	Appreciate 0 Quote

06-24-2019, 02:07 AM	#14
N1rve Racecar Driver 1283 Rep 1,948 Posts Drives: BMW M4 Join Date: Mar 2019 Location: Beverly Hills, California iTrader: (2) Garage List 2019 BMW M4 [9.63]	That looks more like CV Joint grease more than diff fluid.
	Appreciate 0 Quote

06-24-2019, 10:57 AM	#16
chmura Colonel 1558 Rep 2,505 Posts Drives: 2019 M2 Competition Join Date: Aug 2009 Location: Orange County, California iTrader: (1)	This is simply grease and not differential fluid. Your diff is fine. There is thick grease inside the black CV boot that lubricates ball bearings, etc. Looks like that clamp maybe loosened and grease escaped under the boot. You can simply reboot the CV axle and put new packing grease, but since its under warranty just throw in a new axle. Not hard to do. __________________ 2019 M2 Competition- October 2, 2018 ED 2011 BMW M3 Sedan Alpine White Picked up via ED 9/27/2011 & Redelivered 11/23/2011 SOLD
	Appreciate 0 Quote

06-25-2019, 06:34 AM	#17
08mojo Private 77 Rep 86 Posts Drives: 2018 M3 Join Date: Mar 2018 Location: Atlanta iTrader: (0)	Definitely an axle problem, not the differential. The CV joint boot failed (or the CV joint failed and tore the boot). That's axle grease not differential oil, plus it's coming out around the CV boot. Differential oil would come out between the diff and the axle, so further inbound. Regardless, love the Forgelines!
	Appreciate 1 papasmurf_m3454.50 Quote

06-25-2019, 11:06 AM	#19
jacobe92 Major 619 Rep 1,239 Posts Drives: 2016 Hell Rot F80 M3 Join Date: Aug 2010 Location: California iTrader: (6)	Dropped off at the hospital this morning... Attached Images __________________ 2016 Hellrot F80 M3\|JRZ RS Pro with Swift Springs 550/750 spring rates l AP Radical 5000R 9668/9449 lSpiegler SS LinesI DS1.11I Eisenmann DP\|MPE Catback\|18" Forgeline GS1R 18x10 et 22 and 18x11 et 44 NT01 275/35/18 and 305/35/18\| Forgeline GTD1 18x10et43 SquarelM Performance Lip/Splitter\|IND aesthetic mods\|Dinan Toe Link\|Fall Line mono ball conversion kit and upper link kit\| Aim Solo 2DL Smarty Cam\|Simpson Hybrid\|Stilo Offshore helmet.
	Appreciate 0 Quote

06-27-2019, 08:17 AM	#21
Fortyb M-GAM3 240 Rep 1,264 Posts Drives: 2016 SO M3 Join Date: Jun 2008 Location: Huntsville,Al/WHO DAT iTrader: (3)	Subscribed! __________________ Car Enthusiast.
	Appreciate 0 Quote

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search