Differental oil?

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Boostin

New Member

Jul 8, 2004

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Jun 27, 2005

#1

• Jun 27, 2005

• #1

What oil do i need to put in my rear end, it is a stock 8.8 with 3:73. i read somewhere that you put 80-90w with an additive for the trac-lok.

 

bullitstang1313

Member

Jan 21, 2003

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Indianapolis / Columbus, Indiana

Jun 27, 2005

#2

• Jun 27, 2005

• #2

If it has a traction lok in it Ford suggests using a friction modifier along with the 89-90W gear oil. Now a days many of the 80-90W gear oils come with a friction modifier in them already. Lucas gear oil already contains it as well as most synthetics or you can add it in seperately.

 

89CopCoupe

Banned

Feb 17, 2004

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Post Count City

Jun 27, 2005

#3

• Jun 27, 2005

• #3

80-90 with a tube of standard parts store Limited-Slip additive.

Just a note, if you don't have an aftermarket girdle cover with the fill hole in it, you might want to mix the additive and some gear oil in a small oil bottle to pump it in ... the factory fill plug is not the easiest to get to without spilling half the additive all over the fill area ....

First hand experience

 

crazypete

All my crevices are greased.

Oct 22, 2004

930

4

18

Arlington, MA

Jun 27, 2005

#4

• Jun 27, 2005

• #4

Dont use dino gear oil! That friction modifier stinks so intensely it will curl the paint off the walls. It's like pinetree sweat burnt oil.

Use synthetic 75w-90. It doesnt need friction modifier and even if it gives you 1% extra economy from reduced friction, it will pay for itself very fast.

 

B

Boostin

New Member

Jul 8, 2004

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Jun 27, 2005

#5

• Jun 27, 2005

• #5

Well i have access to all the Rotella T 80-90wHD that i need. so i think im gonna use that, cause free is better than 15 bucks a quart

 

maverick0716

Founding Member

Jan 12, 2002

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Chilliwack, BC, Canada

Jun 27, 2005

#6

• Jun 27, 2005

• #6

I use Redline 75W-90 in mine

 

cobra259

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Jul 26, 2004

152

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Waterford Mi

Jun 27, 2005

#7

• Jun 27, 2005

• #7

Boostin said:

Well i have access to all the Rotella T 80-90wHD that i need. so i think im gonna use that, cause free is better than 15 bucks a quart

Click to expand...

Red line is $8.00 a quart, not $15.00....but hey if your going to steal it, yes that would be cheaper!!

 

Fishhawk

New Member

Jun 10, 2004

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Michigan City, Indiana

Jun 27, 2005

#8

• Jun 27, 2005

• #8

I switched to 85/140. Quieted it up nicely. I've found Torco High Performance to be the best. Had to pull the axles last week and got a good look at the gears after 6000 miles and they look as good as the day I put them in.

 

Shakerhood

20+ Year Stangneter

Oct 28, 2004

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Ohio

Jun 27, 2005

#9

• Jun 27, 2005

• #9

89CopCoupe said:

80-90 with a tube of standard parts store Limited-Slip additive.

Just a note, if you don't have an aftermarket girdle cover with the fill hole in it, you might want to mix the additive and some gear oil in a small oil bottle to pump it in ... the factory fill plug is not the easiest to get to without spilling half the additive all over the fill area ....

First hand experience

Click to expand...

You can also fill through the axle vent on the P/S as it is alot easier to get to than the factory fill hole.

 

89MustangGX

I have nothing productive to add!

Jul 3, 2001

10,262

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Mill Creek, WA

Jun 27, 2005

#10

• Jun 27, 2005

• #10

Shakerhood said:

You can also fill through the axle vent on the P/S as it is alot easier to get to than the factory fill hole.

Click to expand...

Only question I have is how you will know when it's full.

I have used Mobil-1, Amsoil, and dino stuff. I prefer all synthetics now. Pick one.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Jun 28, 2005

#11

• Jun 28, 2005

• #11

89MustangGX said:

Only question I have is how you will know when it's full.

Click to expand...

I think he does it like people do trans filling (when filling through the shifter base itself). Remove the filler plug and pour through the vent till it starts seeping out the real filler plug.

 

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o2man98

New Member

Jul 2, 2005

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Jul 2, 2005

#12

• Jul 2, 2005

• #12

I thought that ford was now recommending 75w-140 for all their rearends.

 

DW5.0L

Member

May 28, 2005

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Florida

Jul 3, 2005

#13

• Jul 3, 2005

• #13

I use Amsoil 75W90. Its $7.90 Sythetic Gear Oil and has the friction modifier in it. 4 oz friction modifier would be a good idea in non-synthetic gear oil. A little less than 3 bottles will be needed for the gear oil change.

 

Fishhawk

New Member

Jun 10, 2004

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Michigan City, Indiana

Jul 3, 2005

#14

• Jul 3, 2005

• #14

o2man98 said:

I thought that ford was now recommending 75w-140 for all their rearends.

Click to expand...

I've heard the same thing. I know my F-350 and Mustang rear ends are much quieter with the thick stuff. The gears also look great after much use.