Home » Shop Drag Racing Parts » Ring and Pinion Gear Sets » Mopar 8.75 Gears » Mopar 8 3/4″ 3.91 Standard Gear – 489 Case US/Strange Gear – Produced in USA

Mopar 8 3/4" 3.91 Standard Gear - 489 Case
US/Strange Gear - Produced in USA

$265.00* Free Shipping (Details Below)

Part Number: RS03887391LUS

Standard Gears are the perfect choice for replacement of OEM gear sets
Providing long service life in Street, Street / Track, & Oval track vehicles

These gears can also be used in some Drag Race cars depending on weight & power
If tooth breakage occurs, then a larger rear end will become necessary

Designed For 489 Casting

Machined From 8620 Forged Steel
Heat Treated to Maximize Gear Life
Matched Ring & Pinion Set

Ring Gear
– 8.75″ OD
– Tooth count 43
– 12 bolt holes
– 3/8″-24 LH threads

– 29 spline shaft
– Tooth count 11
– 3/4″-16 RH threads

Unsure about your application?
Please contact a Strange Sales Associate to discuss your vehicle


Complete kit… R5266
Basic kit……….. R5265

Order any Gear Set Online and get free delivery and handling on your entire order! UPS Ground Only. Offer excludes truck freight and oversize fees. Valid on online orders shipped in the contiguous United States.


US Strange / Mopar 8.75 / 3.91 / 29 spline pinion / For 489 case

Additional information

Weight 16.80 lbs