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

THERMAL STABILITY - Maintains consistent performance even under high heat and heavy loads, preventing breakdown.
SYNTHETIC STRENGTH - Advanced synthetic formula reduces wear and extends gear life, outperforming conventional oils.
OEM APPROVED QUALITY - Meets or exceeds manufacturer specs for reliable compatibility and peace of mind.
PRECISION VISCOSITY CONTROL - Engineered 75W-90 grade ensures smooth shifting and peak gear protection under extreme conditions.
PERFECT SIZE FOR MAINTENANCE - 1 Quart bottle designed for easy top-ups and routine gear oil changes without waste.

Royal Purple 01300 Max Gear 75W-90 is a high-performance synthetic gear oil designed to provide superior protection and durability for automotive transmissions. Its advanced formula ensures optimal viscosity, thermal stability, and wear resistance, making it ideal for demanding driving conditions. Packaged in a convenient 1 Quart size, it supports routine maintenance and extends gear life while meeting OEM standards.

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Manufacturer	Royal Purple
Brand	Royal Purple
Model	1300
Product Dimensions	7.62 x 5.08 x 2.54 cm; 453.59 g
Item model number	ROY01300
Manufacturer part number	1300
OEM Part Number	01300
Item Weight	454 g
Viscosity	75W-90

Royal Purple01300 Max Gear 75W-90 High Performance Synthetic Automotive Gear Oil, 1 Quart (32 Ounces)

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