DIY: Rear Differential Oil Change

TipsZ · 12-15-2009, 01:55 PM

Which Diff oil should I use?

Redline 75w90NS Gear oil quarts and cases (w/o friction modifier)
or
Redline 75w90 Gear oil quarts and cases (w/friction modifier)

spearfish25 · 12-15-2009, 04:31 PM

I think I used the 75W90 (no NS designation). Honestly, I never knew there was even a second option.

davidyan · 12-15-2009, 10:06 PM

^ this question was raised on another thread as well. Don't use the NS version as it is not meant for hypoid LSD's.

Zeto · 02-07-2010, 10:28 PM

Just did my diff and man was that stuff nasty! Thanks for the DIY spearfish, +1

m4a1mustang · 02-07-2010, 10:29 PM

I will be doing my rear diff change soon. Can't wait to smell the stuff!!!

spearfish25 · 02-09-2010, 07:05 PM

Quote:

Originally Posted by Zeto

Just did my diff and man was that stuff nasty! Thanks for the DIY spearfish, +1

No problem

. Between the transmission and the diff changes, the diff was visually more pleasing to change. The amount of junk that came out was impressive. However, I didn't notice any driving difference. The tranny however had pristine looking fluid come out, but it shifts like butter now. Go figure.

spearfish25 · 02-09-2010, 07:06 PM

Quote:

Originally Posted by m4a1mustang

I will be doing my rear diff change soon. Can't wait to smell the stuff!!!

Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)

tranceformer · 02-10-2010, 06:51 AM

Quote:

Originally Posted by spearfish25

No problem

. Between the transmission and the diff changes, the diff was visually more pleasing to change. The amount of junk that came out was impressive. However, I didn't notice any driving difference. The tranny however had pristine looking fluid come out, but it shifts like butter now. Go figure.

was there a lot of crap on the magnetic drain plug?

Quote:

Originally Posted by spearfish25

Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)

i like to refer to it as the devil's piss.

m4a1mustang · 02-10-2010, 06:53 AM

Quote:

Originally Posted by spearfish25

Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)

Oh I will make sure to have on some gloves!

Zeto · 02-10-2010, 08:27 AM

Quote:

Originally Posted by tranceformer

was there a lot of crap on the magnetic drain plug?.

It was my first time and yes there was. Make sure you clean it throughly.

vipor · 02-10-2010, 08:48 AM

Some pics from when I changed my fluid a couple weeks ago. So you guys can see the drain and fill locations.

Sorry they're so large and some are blurry.

Drain Plug

Fill Plug

schrute · 02-10-2010, 03:24 PM

Quote:

Originally Posted by tranceformer

was there a lot of crap on the magnetic drain plug?

Here's what mine looked like

initialgemini · 02-10-2010, 03:44 PM

Just for reference, but how often should you change your differential and transmission fluid?

FricFrac · 02-10-2010, 04:05 PM

Don't recall of the top of my head but it is in your service manual - its the first big service IIRC...

tranceformer · 02-10-2010, 07:14 PM

IIRC it's something like 30k miles, but IMO if you're really hard on the car it wouldn't hurt to do it more often.

12-15-2009, 01:55 PM	#16 (permalink)
TipsZ Track Member Join Date: Mar 2009 Location: Lithia, FL Age: 51 Posts: 552 Drives: 09 Nissan 370z CS M6 Rep Power: 186	Which Diff oil should I use? Redline 75w90NS Gear oil quarts and cases (w/o friction modifier) or Redline 75w90 Gear oil quarts and cases (w/friction modifier) __________________ Dynojet 285 HP/245 TQ (pre CBE)// Agency Power CBE // GTM Test Pipes // JWT Pop Chargers // B&M Short Shifter // Eibach Springs // Powder-coated Akebono's // Powder-coated Strut Bar // Black Chromed 19" Rays // // Redline Designs Graphics TipsZ journal

12-15-2009, 04:31 PM	#17 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	I think I used the 75W90 (no NS designation). Honestly, I never knew there was even a second option. __________________ 2013 Cadillac V-Wagon, RIP Z

02-07-2010, 10:29 PM	#20 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	I will be doing my rear diff change soon. Can't wait to smell the stuff!!! __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

02-10-2010, 08:48 AM	#26 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 42 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	Some pics from when I changed my fluid a couple weeks ago. So you guys can see the drain and fill locations. Sorry they're so large and some are blurry. Drain Plug Fill Plug __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

02-10-2010, 03:44 PM	#28 (permalink)
initialgemini Enthusiast Member Join Date: Mar 2009 Location: Irvine, CA Posts: 340 Drives: 2011 FX 35 Rep Power: 250	Just for reference, but how often should you change your differential and transmission fluid? __________________ CY 370z \|Sports Package\| Berk CBE\| Berk High Flow Cats (awaiting install)\|BBS LM\|Eibach Pro-Kit Springs\|Stillen Sway Bars\|TWS Shift Knob\|B&M Short Shifter

12-15-2009, 10:06 PM	#18 (permalink)
davidyan Base Member Join Date: Jun 2009 Location: CA Posts: 244 Drives: PG 370Z Sport 6MT Rep Power: 16	^ this question was raised on another thread as well. Don't use the NS version as it is not meant for hypoid LSD's.

02-07-2010, 10:28 PM	#19 (permalink)
Zeto Track Member Join Date: Apr 2009 Location: North NJ Age: 40 Posts: 766 Drives: 09 Pearl White 370Z Rep Power: 267	Just did my diff and man was that stuff nasty! Thanks for the DIY spearfish, +1

02-10-2010, 04:05 PM	#29 (permalink)
FricFrac A True Z Fanatic Join Date: Dec 2008 Location: Victoria, BC Posts: 1,481 Drives: 370Z 300ZX 280ZX 240 Rep Power: 228	Don't recall of the top of my head but it is in your service manual - its the first big service IIRC... __________________ '09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra //

02-10-2010, 07:14 PM	#30 (permalink)
tranceformer A True Z Fanatic Join Date: Nov 2008 Location: Palm Beach, FL Posts: 1,213 Drives: 2009 370Z PW 6MT Rep Power: 267	IIRC it's something like 30k miles, but IMO if you're really hard on the car it wouldn't hurt to do it more often. __________________ Ray 2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires official 1/4 mile track times

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