rear diff oil

Night Shifter

Well-Known Member

Dec 24, 2005

1,710

27

59

Daytona

Jul 1, 2007

#1

• Jul 1, 2007

• #1

i finally bought a set of 3.73 for my car but i want to use the best gear lube. any suggestions? I'm looking at royal purple max gear 75w90. I'm a noob to the rear diff so how many bottles do i need?does it matter the year car you have for gear lube?

 

N

Nightstick

New Member

Jul 1, 2007

68

0

0

Jul 1, 2007

#2

• Jul 1, 2007

• #2

Night Shifter said:

i finally bought a set of 3.73 for my car but i want to use the best gear lube. any suggestions? I'm looking at royal purple max gear 75w90. I'm a noob to the rear diff so how many bottles do i need?does it matter the year car you have for gear lube?

Click to expand...

I run Mobil 1 75/140 without friction modifier. Need 3 quarts. Won't quite use all of it though.

 

four six

Member

Jan 19, 2006

506

2

18

Hobart, IN

Jul 2, 2007

#3

• Jul 2, 2007

• #3

Year won't matter at all, because they are all the same since 87. 3 qts of Royal purple 75 or 90w

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

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Jul 2, 2007

#4

• Jul 2, 2007

• #4

Plain old 80W-90 gear oil will be fine but overspend if you want...

 

lvmustanggt

New Member

Apr 9, 2006

721

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0

Las Vegas

Jul 2, 2007

#5

• Jul 2, 2007

• #5

with my T/A rear end cover and 3.73 I use 2qt of Royal purple 75w140

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

95

134

Jul 2, 2007

#6

• Jul 2, 2007

• #6

Prior to 2001 Ford spec'd 80W-90 gear oil, mid 2001 they started specifying 75W-140 synth. Should be a tag on the diff if there is any confusion.

Use 4 ounces of friction modifier regardless unless it is already "in there" like with Royal Purple.

 

blackfang

Founding Member

Dec 17, 2001

1,290

1

39

Richmond, Va

Jul 4, 2007

#7

• Jul 4, 2007

• #7

When I did the gears and TA Girdle I used M1 80w90 and Fords bottle of friction modifier.