What are the specs? SAE or other.

STARFIRE Full Synthetic 75W-90, 75W-140 and 80W-140 Gear Lubricants are suitable for use in the following applications: API GL-5; API MT-1; MIL-PRF-2105E; MIL-PRF-2105D; MACK GO-J, GO-H; PG-2 limited slip differentials;

is this good for limited slip rear differential in ford pick up

I'm not sure which Ford spec you require. Please check your manual for the proper fluid recommendations. STARFIRE Full Synthetic 75W-90, 75W-140 and 80W-140 Gear Lubricants are suitable for use in the following applications: • API MT-1 • API GL-5 • MIL-PRF-2105E and MIL PRF 2105D • Mack GO-J, GO-H • PG-2 limited slip differentials

Is this as good as 74W-90 which ised in semi trucks hubs and differentialls? Which one better for bearings?

I sell the full synthetic 75w90 to the hub/axle manufacturer. It is used in their heavy-duty axles and differentials. The 75w140 is the same product just a different viscosity grade.

Do you need to add friction modifiers to meet ford rear end specs m2c118-a ?

STARFIRE Full Synthetic 75W-90, 75W-140 and 80W-140 Gear Lubricants are suitable for use in the following applications: API GL-5 • API MT-1 • MIL-PRF-2105E and MIL PRF 2105D • Mack GO-J, GO-H • PG-2 limited slip differentials The 75W140, 80W140, 75W90, and 50W products all contain friction modifiers.However, I'm not sure what the requirements of the Ford M2C118-A spec are. It may require more or less friction modifiers. I would not recommend adding anything to an oil--it either meets the requirements of a certain spec or it doesn't. Adding the wrong additive that is not compatible with something else in the formula and it could cause major issues such as fallout, precipitate, or gelling.

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Description

⚙️ Gear up with STARFIRE – where power meets protection!

OEM INDUSTRY CERTIFIED - Exceeds GL-5, MT-1, MIL-PRF-2105E/D, Mack GO-J/GO-H, and Volvo i-Shift specs for trusted compatibility.
UNMATCHED THERMAL STABILITY - Keeps viscosity steady under intense heat for smooth, quiet gear operation.
BULK 5 GALLON PAIL CONVENIENCE - Ideal for fleet managers and professionals needing reliable, large-volume gear lubrication.
LONG LASTING CORROSION DEFENSE - Advanced inhibitors shield metal surfaces from rust and moisture damage in harsh environments.
HEAVY DUTY EXTREME PRESSURE FORMULA - Engineered with high-performance anti-wear agents to prevent metal scoring in demanding differentials and transmissions.

STARFIRE SAE 75W-140 Full Synthetic Gear Lubricant is a premium 5-gallon heavy-duty gear oil designed for extreme pressure, high temperature, and corrosion protection in automotive and commercial fleet differentials and transmissions. It meets and exceeds key industry standards including API GL-5 and MT-1, ensuring superior anti-wear performance, thermal stability, and rust prevention for lasting gear reliability.

Specifications

Material	Synthetic
Brand	STARFIRE
Package Information	Pail
Liquid Volume	5 Gallons
Recommended Uses For Product	• API GL-5 • API MT-1 • MIL-PRF-2105E and MIL-PRF-2105D • Mack GO-J, GO-H • PG-2 limited slip differentials
Viscosity	75w140
Upper Temperature Rating	3E+2 Degrees Fahrenheit
Specific Uses For Product	[SOME]
Item Form	Liquid
Global Trade Identification Number	00810029022033
Manufacturer	StarFire Premium Lubricants
Unit Count	640.0 Fluid Ounces
UPC	810029022033
Number of Items	1
Item Weight	34.6 pounds
Product Dimensions	15.2 x 10.6 x 9.5 inches
Item model number	SF F/S 75W140 GL 5 Gallon
Is Discontinued By Manufacturer	No
Manufacturer Part Number	SF F/S 75W140 GL 5 Gallon

Reviews

O**J

Excellent product

I replaced the gear oil in my class 8 drive axles with this oil, I have noticed a significant reduction in temperature on highway during high outside temperatures. My axles run about 25* degrees cooler. I am impressed so far. We’ll see how the wear is after about a million miles.

6.10.2024

C**R

Good Price!!

The Product arrived undamaged and ready for use!

17.08.2024

T**

Great line for heavy rear axle use

Super slick and seems to hold up to abuse. I use this all the time in work truck rear axles.Shipping can be an issue just fyi. Bucket in a box. Never a perfect way to ship. 🤷‍♂️

4.09.2024

J**S

great price good quality

good gear lube came fast

6.01.2024

J**Y

Good buy

Fast shipping, been using it in all my off road rigs. Stepping up the the bucket and getting a pump made servicing them take half as long. No more stupid squeeze bottles!

21.06.2021

E**E

Good quality

Using it for years on my semi. Good stuff

8.05.2021

E**.

Nice product

Works as expected

6.12.2019

T**I

Oil emptied in the back

Either return my money or send me a replacement this one is busted open and half empty

8.08.2024

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