Always use luca 80w-90 in ford ranger 2.3l, 7.5" rear diff. wanted to try this. any issues with it being a 75w vs 80w? is this better than lucas?

I use the royal purple 75w-90 in my RAM 2500 differential. My differential is made by American Axle Manufacturing and I talked with one of their mechanical engineers who said the viscosity requirement is determined by several criteria with ambient and operating temperature being big determinants. I live in a warm climate so he said I could use a heavier weight oil. With that knowledge I don't believe there is a big enough difference between the 75 and 80 other the better lubricity at lower ambient and operating temperature. He did recommend amsoil but said the royal purple is just as good.

I have graphite/ composite synchronizers in my transmission , will they be damaged by the use of anything other than the "Castrol syntorque" recom

I've had the best experience with Redline MT90 in manual transmissions. RP was not working well with syncros (grinding gears when shifting).

I know that the product description says that it is not for use in wet clutch systems, but will it be okay for use in motorcycle final gear (shaft)

Will be fine as a motorcycle final gear oil. I use this product in two BMW motorcycles, a BMW R1150RT and a R1200S, as a final drive oil and also as the transmission oil.

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01300 Max Gear 75W-90 High Performance Synthetic Automotive Gear Oil , 1 Quart (32 Ounces)

01300 Max Gear 75W-90 High Performance Synthetic Automotive Gear Oil , 1 Quart (32 Ounces)

Product ID: 2251740

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Details

Material
Synthetic
Brand
Royal Purple
Package Information
Bottle
Liquid Volume
1 Quarts
Item Weight
16 ounces

🔥Synthetic formula reduces heat & wear

⚙️75W-90 viscosity for optimal gear protection

🛡️Proprietary Snarled additive tech for max durability

Description

🛠️ Gear up with Royal Purple – where performance meets precision!

VERSATILE APPLICATION - Perfect for trucks, RVs, marine engines, and manual transmissions requiring API GL-5/GL-4.
NO EXTRA ADDITIVES NEEDED - Pre-formulated with hypoid friction modifiers for clutch and cone differentials.
SNARLED ADDITIVE TECHNOLOGY - Exclusive formula that outperforms standard oils by reducing friction and wear.
ULTRA TOUGH SYNTHETIC POWER - Engineered to maximize gear strength and longevity under heavy loads.
SMOOTH QUIET COOL OPERATION - Keeps gears running efficiently with less noise and heat buildup.

Royal Purple 01300 Max Gear 75W-90 is a high-performance synthetic gear oil designed to protect and enhance heavily loaded gears. Featuring proprietary Snarled additive technology, it ensures smoother, quieter, and cooler operation across trucks, RVs, marine engines, and manual transmissions requiring API GL-5 or GL-4 fluids. This 1-quart bottle delivers unmatched durability without the need for additional additives.

Specifications

Material	Synthetic
Brand	Royal Purple
Package Information	Bottle
Liquid Volume	1 Quarts
Item Weight	16 ounces
Recommended Uses For Product	Vehicle,Truck
Viscosity	75W-90
Item Form	Oil
Global Trade Identification Number	00641330013003
Manufacturer	Royal Purple
Unit Count	32.0 Fluid Ounces
UPC	641330013003
Number of Items	1
Model	1300
Item Weight	1 pounds
Product Dimensions	3 x 2 x 1 inches
Item model number	ROY01300
Is Discontinued By Manufacturer	No
Manufacturer Part Number	1300
OEM Part Number	01300

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