Due to current market conditions, website pricing may not be up to date.
12 Bolt PRO Gear - Richmond 4:11
1 × $754.95 
LW 8.8" Spool - 31 Spline
1 × $337.50 Subtotal: $1,092.45
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All Spicer ring and pinion gears are designed and tested to meet original equipment specifications. When you purchase genuine Spicer ring and pinion gear sets, you can be confident the ring and pinion set will meet or exceed the exact Dana standards that original equipment manufacturers have relied upon for more than a hundred years.
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 Pro Gears or a larger rear end will become necessary
See Description Tab below for additional Specifications.
Designed For Drag Racing Only
Pro Gears may be necessary when tooth breakage occurs with Standard gear sets
Produced from a softer material, the teeth can flex as opposed to crack and break
The life expectancy can vary anywhere from 15 to 300 runs depending on the vehicle
If a Standard gear provided acceptable life, a Pro gear may not be the right choice
See Description Tab below for additional Specifications.
Designed For Drag Racing Only
Pro Gears may be necessary when tooth breakage occurs with Standard gear sets
Produced from a softer material, the teeth can flex as opposed to crack and break
The life expectancy can vary anywhere from 15 to 300 runs depending on the vehicle
If a Standard gear provided acceptable life, a Pro gear may not be the right choice
See Description Tab below for additional Specifications.
Drag Race Use Only
Requires Specific Aftermarket Components
Case – Designed to utilize 10″ gear sets
Pinion Support – Ability to use 35 spline pinion gear
Housing – Additional clearance provided for 10″ ring gears.
Will Not Fit OEM Cases or Housings.
The ring gear is manufactured to 10″ specifications before the OD is reduced to 9.4″
Resulting in a much stronger tooth design than possible with 9″ or 9 1/2″ Pro Gears
Machined From 9310 Forged Steel
Heat Treated to Optimize Material Properties
Matched Ring & Pinion Set
Designed For Drag Racing OnlyPro Gears may be necessary when tooth breakage occurs with Standard gear sets.
Produced from a softer material, the teeth can flex as opposed to crack and break. The life expectancy can vary anywhere from 15 to 300 runs depending on the vehicle.
If a Standard gear provided acceptable life, a Pro gear may not be the right choice. Machined From 9310 Forged Steel.
Heat Treated to Optimize Material Properties.
Matched Ring & Pinion Set.
Designed for Drag Racing only. Machined and heat Treated from 9310 material. 9″ Ford.
Material: 9310
The superior quality of US Gear products is the result of outstanding design, meticulous engineering and state of the art manufacturing processes perfected over three decades and ISO certified. US Gear precision made ring and pinions are made in the USA and designed to maximize performance and durability. Made from 9310 material to withstand the rigors of Drag Racing, 35 spline pinion. Requires special pinion support or spacer when used with a Strange Ultra Case.
Material: 9310
HD Pro Series Spool
For 40 spline axles
Fits 3.812″ bore aftermarket case
See Description Tab below for additional Specifications.
Pro Series Spool
For 40 spline axles
Fits 3.250″ bore aftermarket case
Features
• Machined from 4140 forged steel
• Lightened to reduce rotating weight
• Broached 40 spline with 45° pressure angle
• Critical dimensions left oversize prior to heat treatment
• Heat treated for further gains in strength
• Finish machining after heat treat to bring surfaces within specifications
• Designed and machined by Strange Engineering
• Forged in the USA
Weighs 7.95 lbs
Ford 8.8
Description:Â Pro Series Spool
See Description Tab below for additional Specifications.
Ford 9″
Description: Pro Series Spool
For 35 spline axles
Fits 3.250″ bore aftermarket case
Features
• Machined from 7075-T6 billet aluminum
• Lightened to reduce rotating weight
• Broached 35 spline with 30° pressure angle
• Black anodized finish
Ford 8.8
Description: Pro Series Spool
See Description Tab below for additional Specifications.
Ford 8.8
Description: Pro Series Spool
See Description Tab below for additional Specifications.
Mopar 8 3/4″
Description: Pro Series Spool
See Description Tab below for additional Specifications
Mopar 8 3/4″
Description: Pro Series Spool
See Description Tab below for additional Specifications.